{"id":297,"date":"2025-11-09T20:11:42","date_gmt":"2025-11-09T12:11:42","guid":{"rendered":"https:\/\/index.cmiteam.cn\/?p=297"},"modified":"2025-11-20T09:02:12","modified_gmt":"2025-11-20T01:02:12","slug":"ctf-%e7%bd%91%e7%bb%9c%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0251109","status":"publish","type":"post","link":"https:\/\/index.cmiteam.cn\/index.php\/2025\/11\/09\/ctf-%e7%bd%91%e7%bb%9c%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0251109\/","title":{"rendered":"CTF \u7f51\u7edc\u57fa\u7840\u77e5\u8bc6\u5b66\u4e60\u7b14\u8bb0251109"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e92\u8054\u7f51\u662f\u600e\u4e48\u5de5\u4f5c\u7684<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">URL\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<p><strong>URL<\/strong> \u662f <strong>Uniform Resource Locator<\/strong> \u7684\u7f29\u5199\uff0c\u4e2d\u6587\u901a\u5e38\u7ffb\u8bd1\u4e3a\u201c\u7edf\u4e00\u8d44\u6e90\u5b9a\u4f4d\u7b26\u201d\u3002<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0cURL \u5c31\u662f\u4e92\u8054\u7f51\u4e0a<strong>\u8d44\u6e90\u7684\u5730\u5740<\/strong>\uff0c\u5c31\u50cf\u4f60\u5bb6\u5728\u5730\u7403\u4e0a\u7684\u8be6\u7ec6\u5730\u5740\u4e00\u6837\u3002\u8fd9\u4e2a\u201c\u8d44\u6e90\u201d\u53ef\u4ee5\u662f\u7f51\u9875\u3001\u56fe\u7247\u3001\u89c6\u9891\u3001\u6587\u4ef6\u3001\u5e94\u7528\u7a0b\u5e8f\u3001API\u63a5\u53e3\u7b49\u7b49\u4efb\u4f55\u53ef\u4ee5\u88ab\u8bbf\u95ee\u5230\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p>\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u6807\u51c6\u7684\u65b9\u5f0f\u6765<strong>\u5b9a\u4f4d<\/strong>\u548c<strong>\u8bbf\u95ee<\/strong>\u8fd9\u4e9b\u8d44\u6e90\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">URL \u7684\u4f5c\u7528<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5b9a\u4f4d\u8d44\u6e90\uff1a<\/strong> \u544a\u8bc9\u6d4f\u89c8\u5668\u6216\u5176\u4ed6\u5ba2\u6237\u7aef\u7a0b\u5e8f\uff0c\u8981\u627e\u7684\u8d44\u6e90\u5728\u54ea\u91cc\u3002<\/li>\n\n\n\n<li><strong>\u8bbf\u95ee\u65b9\u5f0f\uff1a<\/strong> \u544a\u8bc9\u5ba2\u6237\u7aef\u7a0b\u5e8f\uff0c\u5e94\u8be5\u4f7f\u7528\u4ec0\u4e48\u534f\u8bae\uff08\u5982 HTTP\u3001FTP\uff09\u53bb\u8bbf\u95ee\u8fd9\u4e2a\u8d44\u6e90\u3002<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">URL \u7684\u57fa\u672c\u7ed3\u6784<\/h3>\n\n\n\n<p>\u4e00\u4e2a\u5178\u578b\u7684 URL \u901a\u5e38\u7531\u4ee5\u4e0b\u51e0\u4e2a\u4e3b\u8981\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">scheme:\/\/host:port\/path?query#fragment<\/pre>\n\n\n\n<p>\u6211\u4eec\u6765\u9010\u4e00\u5206\u89e3\u8fd9\u4e9b\u90e8\u5206\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong><code>scheme<\/code> (\u534f\u8bae)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u6307\u5b9a\u4e86\u5ba2\u6237\u7aef\uff08\u5982\u6d4f\u89c8\u5668\uff09\u548c\u670d\u52a1\u5668\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u6240\u4f7f\u7528\u7684\u534f\u8bae\u6216\u89c4\u5219\u3002<\/li>\n\n\n\n<li>\u5e38\u89c1\u4f8b\u5b50\uff1a\n<ul class=\"wp-block-list\">\n<li><code>http:\/\/<\/code> (Hypertext Transfer Protocol): \u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\uff0c\u7528\u4e8e\u4f20\u8f93\u8d85\u6587\u672c\u6587\u6863\uff08\u5982\u7f51\u9875\uff09\u3002<\/li>\n\n\n\n<li><code>https:\/\/<\/code> (Hypertext Transfer Protocol Secure): \u5b89\u5168\u8d85\u6587\u672c\u4f20\u8f93\u534f\u8bae\uff0c\u662f HTTP \u7684\u5b89\u5168\u7248\u672c\uff0c\u901a\u8fc7 SSL\/TLS \u52a0\u5bc6\u901a\u4fe1\u3002\u5728CTF\u4e2d\uff0c<code>https<\/code>\u7684\u5b89\u5168\u6027\u662f\u9700\u8981\u8003\u8651\u7684\u3002<\/li>\n\n\n\n<li><code>ftp:\/\/<\/code> (File Transfer Protocol): \u6587\u4ef6\u4f20\u8f93\u534f\u8bae\uff0c\u7528\u4e8e\u6587\u4ef6\u4e0a\u4f20\u548c\u4e0b\u8f7d\u3002<\/li>\n\n\n\n<li><code>mailto:<\/code>: \u7528\u4e8e\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\uff0c\u540e\u9762\u901a\u5e38\u63a5\u90ae\u4ef6\u5730\u5740\u3002<\/li>\n\n\n\n<li><code>file:\/\/<\/code>: \u7528\u4e8e\u8bbf\u95ee\u672c\u5730\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u6587\u4ef6\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u4e86\u89e3\u4e0d\u540c\u7684\u534f\u8bae\u53ef\u4ee5\u5e2e\u52a9\u4f60\u8bc6\u522b\u6f5c\u5728\u7684\u670d\u52a1\u548c\u653b\u51fb\u9762\u3002\u4f8b\u5982\uff0c<code>https<\/code>\u53ef\u80fd\u6d89\u53ca\u5230\u8bc1\u4e66\u95ee\u9898\uff0c<code>ftp<\/code>\u53ef\u80fd\u5b58\u5728\u533f\u540d\u767b\u5f55\u6216\u5f31\u5bc6\u7801\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>host<\/code> (\u4e3b\u673a\u540d \/ \u57df\u540d)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u6307\u5b9a\u4e86\u5b58\u653e\u8d44\u6e90\u7684\u670d\u52a1\u5668\u7684\u540d\u79f0\u6216 IP \u5730\u5740\u3002<\/li>\n\n\n\n<li>\u4f8b\u5b50\uff1a\n<ul class=\"wp-block-list\">\n<li><code>www.example.com<\/code> (\u57df\u540d)<\/li>\n\n\n\n<li><code>192.168.1.100<\/code> (IP \u5730\u5740)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5de5\u4f5c\u539f\u7406\uff1a<\/strong> \u5f53\u4f60\u8f93\u5165\u4e00\u4e2a\u57df\u540d\u65f6\uff0c\u4f60\u7684\u8ba1\u7b97\u673a\u901a\u8fc7 <strong>DNS (Domain Name System)<\/strong> \u5c06\u5176\u89e3\u6790\u6210\u5bf9\u5e94\u7684 IP \u5730\u5740\uff0c\u7136\u540e\u624d\u80fd\u627e\u5230\u670d\u52a1\u5668\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u57df\u540d\u548cIP\u5730\u5740\u662f\u7f51\u7edc\u4fa6\u5bdf\uff08Reconnaissance\uff09\u7684\u5173\u952e\u4fe1\u606f\u3002\u5b50\u57df\u540d\u679a\u4e3e\u3001DNS\u8bb0\u5f55\u67e5\u8be2\u7b49\u90fd\u662f\u5e38\u89c1\u624b\u6cd5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>port<\/code> (\u7aef\u53e3\u53f7) - \u53ef\u9009<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u6307\u5b9a\u4e86\u670d\u52a1\u5668\u4e0a\u7528\u4e8e\u63d0\u4f9b\u7279\u5b9a\u670d\u52a1\u7684\u7aef\u53e3\u53f7\u3002<\/li>\n\n\n\n<li><strong>\u4f8b\u5b50\uff1a<\/strong> <code>:8080<\/code><\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u5982\u679c\u4f7f\u7528\u534f\u8bae\u7684\u9ed8\u8ba4\u7aef\u53e3\uff08\u4f8b\u5982 HTTP \u7684 80 \u7aef\u53e3\uff0cHTTPS \u7684 443 \u7aef\u53e3\uff09\uff0c\u5219\u901a\u5e38\u53ef\u4ee5\u7701\u7565\u4e0d\u5199\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u626b\u63cf\u5f00\u653e\u7aef\u53e3\u662f\u6e17\u900f\u6d4b\u8bd5\u7684\u7b2c\u4e00\u6b65\u3002\u975e\u6807\u51c6\u7aef\u53e3\uff08\u5982 8080\u30018443\uff09\u5e38\u5e38\u8fd0\u884c\u7740\u7279\u6b8a\u7684Web\u670d\u52a1\u6216\u7ba1\u7406\u754c\u9762\uff0c\u662f\u6f5c\u5728\u7684\u653b\u51fb\u76ee\u6807\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>path<\/code> (\u8def\u5f84)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u6307\u5b9a\u4e86\u670d\u52a1\u5668\u4e0a\u8d44\u6e90\u7684\u5177\u4f53\u4f4d\u7f6e\uff0c\u7c7b\u4f3c\u4e8e\u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u76ee\u5f55\u7ed3\u6784\u3002<\/li>\n\n\n\n<li><strong>\u4f8b\u5b50\uff1a<\/strong> <code>\/blog\/article\/latest.html<\/code><\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u901a\u5e38\u4ee5 <code>\/<\/code> \u5f00\u5934\uff0c\u8868\u793a\u6839\u76ee\u5f55\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u8def\u5f84\u904d\u5386\uff08Path Traversal\uff0c\u5982 <code>..\/<\/code> \u653b\u51fb\uff09\u3001\u76ee\u5f55\u7206\u7834\u3001\u6587\u4ef6\u5305\u542b\uff08Local File Inclusion\/Remote File Inclusion\uff09\u7b49\u6f0f\u6d1e\u90fd\u4e0e\u8def\u5f84\u5bc6\u5207\u76f8\u5173\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>query<\/code> (\u67e5\u8be2\u5b57\u7b26\u4e32) - \u53ef\u9009<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u7528\u4e8e\u5411\u670d\u52a1\u5668\u4f20\u9012\u989d\u5916\u53c2\u6570\uff0c\u901a\u5e38\u4ee5 <code>?<\/code> \u5f00\u5934\uff0c\u540e\u9762\u8ddf\u7740\u4e00\u7cfb\u5217 <code>key=value<\/code> \u7684\u952e\u503c\u5bf9\uff0c\u591a\u4e2a\u952e\u503c\u5bf9\u4e4b\u95f4\u7528 <code>&amp;<\/code> \u8fde\u63a5\u3002<\/li>\n\n\n\n<li><strong>\u4f8b\u5b50\uff1a<\/strong> <code>?category=laptops&amp;id=12345<\/code><\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u4e3b\u8981\u7528\u4e8e\u52a8\u6001\u7f51\u9875\uff0c\u5411\u670d\u52a1\u5668\u811a\u672c\u4f20\u9012\u6570\u636e\uff0c\u4f8b\u5982\u641c\u7d22\u5173\u952e\u8bcd\u3001\u5546\u54c1ID\u3001\u7528\u6237\u4f1a\u8bdd\u4fe1\u606f\u7b49\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u8fd9\u662f\u6f0f\u6d1e\u5229\u7528\u7684\u91cd\u707e\u533a\uff01SQL\u6ce8\u5165\u3001XSS\u3001\u547d\u4ee4\u6ce8\u5165\u3001\u53c2\u6570\u7be1\u6539\u3001\u903b\u8f91\u6f0f\u6d1e\u7b49\u90fd\u7ecf\u5e38\u901a\u8fc7\u4fee\u6539\u67e5\u8be2\u5b57\u7b26\u4e32\u4e2d\u7684\u53c2\u6570\u6765\u89e6\u53d1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>fragment<\/code> (\u7247\u6bb5\u6807\u8bc6\u7b26 \/ \u951a\u70b9) - \u53ef\u9009<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u4e49\uff1a<\/strong> \u7528\u4e8e\u6307\u5b9a\u7f51\u9875\u5185\u90e8\u7684\u67d0\u4e2a\u7279\u5b9a\u4f4d\u7f6e\uff08\u901a\u5e38\u662f\u5e26\u6709 <code>id<\/code> \u5c5e\u6027\u7684 HTML \u5143\u7d20\uff09\u3002\u5b83\u4ee5 <code>#<\/code> \u5f00\u5934\u3002<\/li>\n\n\n\n<li><strong>\u4f8b\u5b50\uff1a<\/strong> <code>#section_description<\/code><\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u8fd9\u90e8\u5206\u5185\u5bb9<strong>\u4e0d\u4f1a<\/strong>\u53d1\u9001\u5230\u670d\u52a1\u5668\uff0c\u800c\u662f\u7531\u6d4f\u89c8\u5668\u5728\u5ba2\u6237\u7aef\u8fdb\u884c\u5904\u7406\uff0c\u7528\u4e8e\u9875\u9762\u5185\u7684\u8df3\u8f6c\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u867d\u7136\u7247\u6bb5\u672c\u8eab\u4e0d\u76f4\u63a5\u4e0e\u670d\u52a1\u5668\u4ea4\u4e92\uff0c\u4f46\u5728\u67d0\u4e9b\u524d\u7aef\u653b\u51fb\uff08\u5982DOM XSS\uff09\u4e2d\uff0c\u5b83\u53ef\u80fd\u88ab\u5229\u7528\u6765\u6ce8\u5165\u6076\u610f\u4ee3\u7801\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u5b8c\u6574\u793a\u4f8b<\/h3>\n\n\n\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u5b8c\u6574\u7684 URL \u4f8b\u5b50\uff0c\u5e76\u5206\u89e3\u5b83\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">https:\/\/www.google.com:443\/search?q=ctf+url+explanation&amp;sourceid=chrome&amp;ie=UTF-8#top<\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>https<\/code><\/strong>: \u534f\u8bae (Scheme)<\/li>\n\n\n\n<li><strong><code>www.google.com<\/code><\/strong>: \u4e3b\u673a\u540d\/\u57df\u540d (Host)<\/li>\n\n\n\n<li><strong><code>:443<\/code><\/strong>: \u7aef\u53e3\u53f7 (Port) - HTTPS \u7684\u9ed8\u8ba4\u7aef\u53e3\uff0c\u901a\u5e38\u53ef\u4ee5\u7701\u7565<\/li>\n\n\n\n<li><strong><code>\/search<\/code><\/strong>: \u8def\u5f84 (Path)<\/li>\n\n\n\n<li><code>?q=ctf+url+explanation&amp;sourceid=chrome&amp;ie=UTF-8<\/code>: \u67e5\u8be2\u5b57\u7b26\u4e32 (Query String)\n<ul class=\"wp-block-list\">\n<li><code>q=ctf+url+explanation<\/code>: \u641c\u7d22\u5173\u952e\u8bcd<\/li>\n\n\n\n<li><code>sourceid=chrome<\/code>: \u6765\u6e90ID<\/li>\n\n\n\n<li><code>ie=UTF-8<\/code>: \u7f16\u7801\u65b9\u5f0f<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong><code>#top<\/code><\/strong>: \u7247\u6bb5\u6807\u8bc6\u7b26 (Fragment) - \u6307\u5411\u9875\u9762\u9876\u90e8<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">CTF \u4e2d\u7684\u610f\u4e49<\/h3>\n\n\n\n<p>\u5728 CTF \u4e2d\uff0c\u7406\u89e3 URL \u7684\u7ed3\u6784\u548c\u6bcf\u4e2a\u90e8\u5206\u7684\u542b\u4e49\u81f3\u5173\u91cd\u8981\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4fa6\u5bdf (Reconnaissance)\uff1a<\/strong> \u901a\u8fc7\u5206\u6790 URL \u7ed3\u6784\uff0c\u53ef\u4ee5\u63a8\u65ad\u51fa\u7f51\u7ad9\u7684\u76ee\u5f55\u7ed3\u6784\u3001\u4f7f\u7528\u7684\u6280\u672f\uff08\u5982\u6587\u4ef6\u6269\u5c55\u540d\uff09\u3001\u53ef\u80fd\u5b58\u5728\u7684\u53c2\u6570\u3002<\/li>\n\n\n\n<li>\u6f0f\u6d1e\u5229\u7528\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u67e5\u8be2\u5b57\u7b26\u4e32\uff1a<\/strong> \u662f SQL \u6ce8\u5165\u3001XSS\u3001\u547d\u4ee4\u6ce8\u5165\u3001\u53c2\u6570\u7be1\u6539\u7b49\u6f0f\u6d1e\u7684\u5e38\u89c1\u5165\u53e3\u70b9\u3002<\/li>\n\n\n\n<li><strong>\u8def\u5f84\uff1a<\/strong> \u8def\u5f84\u904d\u5386\u3001\u6587\u4ef6\u5305\u542b\u3001\u76ee\u5f55\u904d\u5386\u7b49\u6f0f\u6d1e\u7684\u5229\u7528\u70b9\u3002<\/li>\n\n\n\n<li><strong>\u534f\u8bae\uff1a<\/strong> \u8bc6\u522b\u4e0d\u5b89\u5168\u7684\u534f\u8bae\uff08\u5982 HTTP \u800c\u975e HTTPS\uff09\u6216\u7279\u6b8a\u534f\u8bae\uff08\u5982 <code>file:\/\/<\/code>\u3001<code>ftp:\/\/<\/code>\uff09\u53ef\u80fd\u63ed\u793a\u5176\u4ed6\u653b\u51fb\u9762\u3002<\/li>\n\n\n\n<li><strong>\u4e3b\u673a\u540d\/\u57df\u540d\uff1a<\/strong> \u4e86\u89e3\u5b50\u57df\u540d\u3001Host Header \u653b\u51fb\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u7aef\u53e3\uff1a<\/strong> \u8bc6\u522b\u975e\u6807\u51c6\u7aef\u53e3\u4e0a\u7684\u670d\u52a1\uff0c\u53ef\u80fd\u53d1\u73b0\u672a\u53d7\u4fdd\u62a4\u7684\u7ba1\u7406\u754c\u9762\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">URL\u4e0eURL\u7f16\u7801<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">URI\u662f\u4ec0\u4e48<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">URI \u662f\u4ec0\u4e48\uff1f<\/h3>\n\n\n\n<p><strong>URI<\/strong> \u662f <strong>Uniform Resource Identifier<\/strong> \u7684\u7f29\u5199\uff0c\u4e2d\u6587\u901a\u5e38\u7ffb\u8bd1\u4e3a\u201c\u7edf\u4e00\u8d44\u6e90\u6807\u8bc6\u7b26\u201d\u3002<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0cURI \u662f\u4e00\u4e2a\u66f4\u5e7f\u6cdb\u3001\u66f4\u62bd\u8c61\u7684\u6982\u5ff5\uff0c\u5b83\u662f\u4e00\u4e2a\u7528\u4e8e<strong>\u6807\u8bc6<\/strong>\u4e92\u8054\u7f51\u4e0a\u4efb\u4f55\u8d44\u6e90\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u4e2a\u201c\u6807\u8bc6\u201d\u53ef\u4ee5\u662f\u8d44\u6e90\u7684<strong>\u4f4d\u7f6e<\/strong>\uff0c\u4e5f\u53ef\u4ee5\u662f\u8d44\u6e90\u7684<strong>\u540d\u79f0<\/strong>\uff0c\u6216\u8005\u4e24\u8005\u517c\u6709\u3002<\/p>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u628a URI \u7406\u89e3\u4e3a\u8d44\u6e90\u7684<strong>\u8eab\u4efd\u8bc1\u53f7<\/strong>\u3002\u5b83\u544a\u8bc9\u4f60\u201c\u8fd9\u662f\u4ec0\u4e48\u8d44\u6e90\u201d\uff0c\u4f46\u53ef\u80fd\u4e0d\u4e00\u5b9a\u544a\u8bc9\u4f60\u201c\u8fd9\u4e2a\u8d44\u6e90\u5728\u54ea\u91cc\u201d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">URI \u4e0e URL\u3001URN \u7684\u5173\u7cfb<\/h3>\n\n\n\n<p><strong>URI \u662f\u4e00\u4e2a\u8d85\u96c6\uff08Superset\uff09\uff0c\u800c URL \u548c URN \u90fd\u662f URI \u7684\u5b50\u96c6\u3002<\/strong><\/p>\n\n\n\n<p>\u7528\u4e00\u4e2a\u7b80\u5355\u7684\u56fe\u6765\u8868\u793a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"> &nbsp; &nbsp;  URI (\u7edf\u4e00\u8d44\u6e90\u6807\u8bc6\u7b26)<br> &nbsp; &nbsp; &nbsp; \/ &nbsp;  \\<br> &nbsp; &nbsp;  \/ &nbsp; &nbsp;  \\<br> &nbsp;  URL &nbsp; &nbsp; &nbsp; URN<br>(\u7edf\u4e00\u8d44\u6e90\u5b9a\u4f4d\u7b26) (\u7edf\u4e00\u8d44\u6e90\u540d\u79f0)<\/pre>\n\n\n\n<p>\u8fd9\u610f\u5473\u7740\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6240\u6709\u7684 URL \u90fd\u662f URI\u3002<\/strong><\/li>\n\n\n\n<li><strong>\u6240\u6709\u7684 URN \u90fd\u662f URI\u3002<\/strong><\/li>\n\n\n\n<li><strong>\u4f46\u4e0d\u662f\u6240\u6709\u7684 URI \u90fd\u662f URL<\/strong>\uff08\u56e0\u4e3a\u5b83\u53ef\u4ee5\u662f URN\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e5f\u4e0d\u662f\u6240\u6709\u7684 URI \u90fd\u662f URN<\/strong>\uff08\u56e0\u4e3a\u5b83\u53ef\u4ee5\u662f URL\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u6211\u4eec\u5df2\u7ecf\u8be6\u7ec6\u8bb2\u4e86 URL\uff0c\u73b0\u5728\u6211\u4eec\u6765\u770b\u770b URN\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. URL (Uniform Resource Locator) - \u7edf\u4e00\u8d44\u6e90\u5b9a\u4f4d\u7b26<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f5c\u7528\uff1a<\/strong> <strong>\u5b9a\u4f4d<\/strong>\u8d44\u6e90\u3002\u5b83\u4e0d\u4ec5\u6807\u8bc6\u4e86\u8d44\u6e90\uff0c\u8fd8\u63d0\u4f9b\u4e86<strong>\u83b7\u53d6\u8be5\u8d44\u6e90\u7684\u65b9\u6cd5\uff08\u534f\u8bae\uff09\u548c\u4f4d\u7f6e<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u544a\u8bc9\u6211\u4eec<strong>\u5982\u4f55\u8bbf\u95ee<\/strong>\u4ee5\u53ca<strong>\u5728\u54ea\u91cc<\/strong>\u53ef\u4ee5\u627e\u5230\u8d44\u6e90\u3002<\/li>\n\n\n\n<li><strong>\u7c7b\u6bd4\uff1a<\/strong> \u5c31\u50cf\u4f60\u5bb6\u7684<strong>\u8be6\u7ec6\u5730\u5740<\/strong>\uff08\u5305\u62ec\u7701\u3001\u5e02\u3001\u533a\u3001\u8857\u9053\u3001\u95e8\u724c\u53f7\uff09\uff0c\u901a\u8fc7\u8fd9\u4e2a\u5730\u5740\uff0c\u5feb\u9012\u5458\u5c31\u80fd\u627e\u5230\u4f60\u5bb6\u3002<\/li>\n\n\n\n<li>\u4f8b\u5b50\uff1a\n<ul class=\"wp-block-list\">\n<li><code>https:\/\/www.example.com\/path\/to\/document.html<\/code><\/li>\n\n\n\n<li><code>ftp:\/\/ftp.example.com\/pub\/file.zip<\/code><\/li>\n\n\n\n<li><code>file:\/\/\/C:\/Users\/user\/Documents\/report.pdf<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. URN (Uniform Resource Name) - \u7edf\u4e00\u8d44\u6e90\u540d\u79f0<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f5c\u7528\uff1a<\/strong> <strong>\u547d\u540d<\/strong>\u8d44\u6e90\u3002\u5b83\u901a\u8fc7\u4e00\u4e2a<strong>\u6301\u4e45\u7684\u3001\u5168\u5c40\u552f\u4e00\u7684\u540d\u5b57<\/strong>\u6765\u6807\u8bc6\u8d44\u6e90\uff0c\u800c\u4e0e\u8d44\u6e90\u7684\u4f4d\u7f6e\u65e0\u5173\u3002<\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u544a\u8bc9\u6211\u4eec<strong>\u8fd9\u4e2a\u8d44\u6e90\u662f\u4ec0\u4e48<\/strong>\uff0c\u4f46<strong>\u4e0d\u544a\u8bc9\u6211\u4eec\u5982\u4f55\u8bbf\u95ee\u5b83\u6216\u5728\u54ea\u91cc\u627e\u5230\u5b83<\/strong>\u3002\u5373\u4f7f\u8d44\u6e90\u7684\u4f4d\u7f6e\u6539\u53d8\u4e86\uff0c\u5b83\u7684 URN \u4ecd\u7136\u4fdd\u6301\u4e0d\u53d8\u3002<\/li>\n\n\n\n<li><strong>\u7c7b\u6bd4\uff1a<\/strong> \u5c31\u50cf\u4e00\u672c\u4e66\u7684 <strong>ISBN \u53f7\u7801<\/strong>\uff08\u56fd\u9645\u6807\u51c6\u4e66\u53f7\uff09\uff0c\u6216\u8005\u4e00\u4e2a\u4eba\u7684<strong>\u8eab\u4efd\u8bc1\u53f7\u7801<\/strong>\u3002\u901a\u8fc7 ISBN\uff0c\u4f60\u77e5\u9053\u662f\u54ea\u672c\u4e66\uff0c\u4f46\u4e0d\u77e5\u9053\u5728\u54ea\u91cc\u80fd\u4e70\u5230\u6216\u501f\u5230\u8fd9\u672c\u4e66\u3002<\/li>\n\n\n\n<li>\u4f8b\u5b50\uff1a\n<ul class=\"wp-block-list\">\n<li><code>urn:isbn:0451450523<\/code> (\u6807\u8bc6\u4e00\u672c\u540d\u4e3a \"The Last Unicorn\" \u7684\u4e66)<\/li>\n\n\n\n<li><code>urn:ietf:rfc:2141<\/code> (\u6807\u8bc6 IETF \u7684 RFC 2141 \u6587\u6863)<\/li>\n\n\n\n<li><code>urn:uuid:6e8bc430-9c3a-11d9-9669-0800200c9a66<\/code> (\u6807\u8bc6\u4e00\u4e2a\u901a\u7528\u552f\u4e00\u6807\u8bc6\u7b26)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> URN \u5728\u5b9e\u9645\u7684 Web \u6d4f\u89c8\u4e2d\u4e0d\u5982 URL \u5e38\u89c1\uff0c\u4f46\u5b83\u4eec\u5728\u56fe\u4e66\u9986\u7cfb\u7edf\u3001\u6570\u5b57\u7248\u6743\u7ba1\u7406\u548c\u5206\u5e03\u5f0f\u4fe1\u606f\u7cfb\u7edf\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u4eec\u63d0\u4f9b\u4e86\u8d44\u6e90\u7684\u6301\u4e45\u6807\u8bc6\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u7ed3<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>URI (Uniform Resource Identifier)<\/strong>\uff1a<strong>\u6807\u8bc6<\/strong>\u8d44\u6e90\u3002\u4e00\u4e2a\u5e7f\u4e49\u7684\u6982\u5ff5\uff0c\u5305\u62ec\u5b9a\u4f4d\u548c\u547d\u540d\u3002<\/li>\n\n\n\n<li><strong>URL (Uniform Resource Locator)<\/strong>\uff1a<strong>\u5b9a\u4f4d<\/strong>\u8d44\u6e90\u3002\u544a\u8bc9\u4f60\u5728\u54ea\u91cc\u4ee5\u53ca\u5982\u4f55\u627e\u5230\u8d44\u6e90\u3002<\/li>\n\n\n\n<li><strong>URN (Uniform Resource Name)<\/strong>\uff1a<strong>\u547d\u540d<\/strong>\u8d44\u6e90\u3002\u901a\u8fc7\u4e00\u4e2a\u6301\u4e45\u7684\u540d\u79f0\u6765\u6807\u8bc6\u8d44\u6e90\uff0c\u4e0d\u5173\u5fc3\u5176\u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u6700\u7b80\u5355\u7684\u8bb0\u5fc6\u65b9\u5f0f\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>URI = URL + URN<\/strong><\/li>\n\n\n\n<li><strong>URL \u544a\u8bc9\u4f60\u201c\u5728\u54ea\u91cc\u201d<\/strong> (Location)<\/li>\n\n\n\n<li><strong>URN \u544a\u8bc9\u4f60\u201c\u662f\u4ec0\u4e48\u201d<\/strong> (Name)<\/li>\n<\/ul>\n\n\n\n<p>\u5728\u65e5\u5e38\u7684 Web \u4ea4\u4e92\u548c CTF \u4e2d\uff0c\u4f60\u51e0\u4e4e\u603b\u662f\u4f1a\u9047\u5230 <strong>URL<\/strong>\u3002\u5f53\u4eba\u4eec\u8bf4\u201cURI\u201d\u65f6\uff0c\u4ed6\u4eec\u901a\u5e38\u6307\u7684\u4e5f\u662f URL\uff0c\u56e0\u4e3a URL \u662f\u6700\u5e38\u89c1\u7684 URI \u7c7b\u578b\u3002\u4f46\u4ece\u6280\u672f\u4e0a\u8bb2\uff0c\u7406\u89e3\u5b83\u4eec\u4e4b\u95f4\u7684\u533a\u522b\u662f\u5f88\u91cd\u8981\u7684\u3002<\/p>\n\n\n\n<p>\u90a3\u6211\u4eec\u65e0\u6240\u4e0d\u77e5\u7684<a href=\"https:\/\/zhida.zhihu.com\/search?content_id=100694358&amp;content_type=Article&amp;match_order=1&amp;q=%E7%BB%B4%E5%9F%BA%E7%99%BE%E7%A7%91&amp;zd_token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ6aGlkYV9zZXJ2ZXIiLCJleHAiOjE3NjI4NTczMzUsInEiOiLnu7Tln7rnmb7np5EiLCJ6aGlkYV9zb3VyY2UiOiJlbnRpdHkiLCJjb250ZW50X2lkIjoxMDA2OTQzNTgsImNvbnRlbnRfdHlwZSI6IkFydGljbGUiLCJtYXRjaF9vcmRlciI6MSwiemRfdG9rZW4iOm51bGx9.CIscPwK_MhzOEo-LQlgwU5V1kXaDOxHO3ka3t67LH8k&amp;zhida_source=entity\" target=\"_blank\"  rel=\"nofollow\" >\u7ef4\u57fa\u767e\u79d1<\/a>\u628a\u8fd9\u6bb5\u6d88\u5316\u7684\u5f88\u597d\uff0c\u5e76\u63cf\u8ff0\u7684\u66f4\u52a0\u5f62\u8c61\u4e86\uff1a<\/p>\n\n\n\n<p><strong>\u201cURI\u53ef\u4ee5\u5206\u4e3aURL,URN\u6216\u540c\u65f6\u5177\u5907locators \u548cnames\u7279\u6027\u7684\u4e00\u4e2a\u4e1c\u897f\u3002URN\u4f5c\u7528\u5c31\u597d\u50cf\u4e00\u4e2a\u4eba\u7684\u540d\u5b57\uff0cURL\u5c31\u50cf\u4e00\u4e2a\u4eba\u7684\u5730\u5740\u3002\u6362\u53e5\u8bdd\u8bf4\uff1aURN\u786e\u5b9a\u4e86\u4e1c\u897f\u7684\u8eab\u4efd\uff0cURL\u63d0\u4f9b\u4e86\u627e\u5230\u5b83\u7684\u65b9\u5f0f\u3002\u201d<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u65b9\u4fbf\u7406\u89e3\uff1a<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9996\u5148\uff0cURL\u662fURI\u7684\u4e00\u79cd\uff08\u901a\u8fc7\u90a3\u4e2a\u56fe\u5c31\u770b\u7684\u51fa\u6765\u5427\uff09\u3002\u6240\u4ee5\u6709\u4eba\u8ddf\u4f60\u8bf4URL\u4e0d\u662fURI\uff0c\u4ed6\u5c31\u9519\u4e86\u5457\u3002\u4f46\u4e5f\u4e0d\u662f\u6240\u6709\u7684URI\u90fd\u662fURL\u54e6\uff0c\u5c31\u597d\u50cf\u8774\u8776\u90fd\u4f1a\u98de\uff0c\u4f46\u4f1a\u98de\u7684\u53ef\u4e0d\u90fd\u662f\u8774\u8776\u554a\uff0c\u4f60\u8ba9\u82cd\u8747\u600e\u4e48\u60f3\uff01<\/li>\n\n\n\n<li>\u8ba9URI\u80fd\u6210\u4e3aURL\u7684\u5f53\u7136\u5c31\u662f\u90a3\u4e2a\u201c\u8bbf\u95ee\u673a\u5236\u201d\uff0c\u201c\u7f51\u7edc\u4f4d\u7f6e\u201d\u3002e.g. <code>http:\/\/<\/code> or <code>ftp:\/\/<\/code>.\u3002<\/li>\n\n\n\n<li>URN\u662f\u552f\u4e00\u6807\u8bc6\u7684\u4e00\u90e8\u5206\uff0c\u5c31\u662f\u4e00\u4e2a\u7279\u6b8a\u7684\u540d\u5b57\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u3000\u3000\u4e0b\u9762\u5c31\u6765\u770b\u770b\u4f8b\u5b50\u5427\uff0c\u5f53\u6765\u4e5f\u662f\u6765\u81ea\u6743\u5a01\u7684RFC\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ftp:\/\/ftp.is.co.za\/rfc\/rfc1808.txt<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>http:\/\/www.ietf.org\/rfc\/rfc2396.txt<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>ldap:\/\/[2001:db8::7]\/c=GB?objectClass?one<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>mailto:John.Doe@example.com<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>news:comp.infosystems.www.servers.unix<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>tel:+1-816-555-1212<\/code><\/li>\n\n\n\n<li><code>telnet:\/\/192.0.2.16:80\/<\/code> (also a URL because of the protocol)<\/li>\n\n\n\n<li><code>urn:oasis:names:specification:docbook:dtd:xml:4.1.2<\/code><\/li>\n<\/ul>\n\n\n\n<p>\u3000\u3000\u8fd9\u4e9b\u5168\u90fd\u662fURI, \u5176\u4e2d\u6709\u4e9b\u662fURL\u3002\u54ea\u4e9b? \u5c31\u662f\u90a3\u4e9b\u63d0\u4f9b\u4e86\u8bbf\u95ee\u673a\u5236\u7684\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5565\u662f\u8d85\u94fe\u63a5\uff1f<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">TCP\/IP \u662f\u4ec0\u4e48 \u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\u7684\u8be6\u7ec6\u8fc7\u7a0b\u89e3\u6790<\/h2>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"650\" height=\"725\" src=\"https:\/\/index.cmiteam.cn\/wp-content\/uploads\/2025\/11\/1762690286-v2-a40ac12e217adba03e4690dc66c506cc_1440w.jpg\" alt=\"img\" class=\"wp-image-303\" srcset=\"https:\/\/index.cmiteam.cn\/wp-content\/uploads\/2025\/11\/1762690286-v2-a40ac12e217adba03e4690dc66c506cc_1440w.jpg 650w, https:\/\/index.cmiteam.cn\/wp-content\/uploads\/2025\/11\/1762690286-v2-a40ac12e217adba03e4690dc66c506cc_1440w-269x300.jpg 269w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e09\u6b21\u63e1\u624b \u5efa\u7acb\u53ef\u9760\u8fde\u63a5<\/strong><\/h3>\n\n\n\n<p><strong>\u76ee\u7684\uff1a<\/strong> \u786e\u4fdd\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u90fd\u80fd\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\uff0c\u5e76\u540c\u6b65\u5f7c\u6b64\u7684\u521d\u59cb\u5e8f\u5217\u53f7 (ISN)\uff0c\u4ece\u800c\u5efa\u7acb\u4e00\u4e2a\u53ef\u9760\u7684\u3001\u5168\u53cc\u5de5\u7684\u8fde\u63a5\u3002<\/p>\n\n\n\n<p><strong>\u8fc7\u7a0b\u8be6\u89e3\uff1a<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/ucc.alicdn.com\/sqwzxd2m3mcv6_20240819_aa69dd7bd56649e4af69eec224c91ad7.png?x-oss-process=image\/resize,w_1400\/format,webp\" alt=\"img\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/ucc.alicdn.com\/sqwzxd2m3mcv6_20240819_2605adb7fc5f408f9448558dc75d18dc.png?x-oss-process=image\/resize,w_1400\/format,webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7b2c\u4e00\u6b21\u63e1\u624b (SYN)\uff1a\u5ba2\u6237\u7aef -> \u670d\u52a1\u5668<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u5ba2\u6237\u7aef\u72b6\u6001\uff1a<\/strong> <code>CLOSED<\/code> -> <code>SYN-SENT<\/code><\/li>\n\n\n\n<li><strong>\u5ba2\u6237\u7aef\u52a8\u4f5c\uff1a<\/strong> \u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a <strong>SYN (Synchronize)<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>SYN<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u968f\u673a\u751f\u6210\u7684<strong>\u521d\u59cb\u5e8f\u5217\u53f7 (ISN_C)<\/strong>\uff0c\u4f8b\u5982 <code>seq=X<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u5ba2\u6237\u7aef\u8bf4\uff1a\u201c\u5582\uff0c\u670d\u52a1\u5668\uff01\u6211\u60f3\u548c\u4f60\u5efa\u7acb\u8fde\u63a5\uff0c\u6211\u7684\u8d77\u59cb\u7f16\u53f7\u662fX\u3002\u4f60\u6536\u5230\u6211\u4e86\u5417\uff1f\u201d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e8c\u6b21\u63e1\u624b (SYN-ACK)\uff1a\u670d\u52a1\u5668 -> \u5ba2\u6237\u7aef<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u670d\u52a1\u5668\u72b6\u6001\uff1a<\/strong> <code>LISTEN<\/code> -> <code>SYN-RECEIVED<\/code><\/li>\n\n\n\n<li><strong>\u670d\u52a1\u5668\u52a8\u4f5c\uff1a<\/strong> \u670d\u52a1\u5668\u6536\u5230\u5ba2\u6237\u7aef\u7684 <code>SYN<\/code> \u540e\uff0c\u5982\u679c\u540c\u610f\u5efa\u7acb\u8fde\u63a5\uff0c\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>SYN-ACK<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>SYN<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li><code>ACK<\/code> (Acknowledgment) \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u53f7 (ack)<\/strong> \u8bbe\u7f6e\u4e3a <code>X + 1<\/code>\uff0c\u8868\u793a\u5df2\u6210\u529f\u6536\u5230\u5ba2\u6237\u7aef\u7684 <code>SYN<\/code>\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u670d\u52a1\u5668\u81ea\u5df1\u968f\u673a\u751f\u6210\u7684<strong>\u521d\u59cb\u5e8f\u5217\u53f7 (ISN_S)<\/strong>\uff0c\u4f8b\u5982 <code>seq=Y<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u670d\u52a1\u5668\u8bf4\uff1a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684\u8bf7\u6c42\uff08\u786e\u8ba4\u53f7X+1\uff09\uff0c\u6211\u4e5f\u540c\u610f\u5efa\u7acb\u8fde\u63a5\uff0c\u6211\u7684\u8d77\u59cb\u7f16\u53f7\u662fY\u3002\u4f60\u6536\u5230\u6211\u4e86\u5417\uff1f\u201d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e09\u6b21\u63e1\u624b (ACK)\uff1a\u5ba2\u6237\u7aef -> \u670d\u52a1\u5668<\/strong><ul><li><strong>\u5ba2\u6237\u7aef\u72b6\u6001\uff1a<\/strong> <code>SYN-SENT<\/code> -> <code>ESTABLISHED<\/code><\/li><li><strong>\u5ba2\u6237\u7aef\u52a8\u4f5c\uff1a<\/strong> \u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684 <code>SYN-ACK<\/code> \u540e\uff0c\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>ACK<\/strong> \u62a5\u6587\u6bb5\u3002<ul><li><code>ACK<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li><li><strong>\u786e\u8ba4\u53f7 (ack)<\/strong> \u8bbe\u7f6e\u4e3a <code>Y + 1<\/code>\uff0c\u8868\u793a\u5df2\u6210\u529f\u6536\u5230\u670d\u52a1\u5668\u7684 <code>SYN<\/code>\u3002<\/li><li><strong>\u6ce8\u610f\uff1a<\/strong> \u8fd9\u4e2a\u62a5\u6587\u6bb5\u53ef\u4ee5\u643a\u5e26\u6570\u636e\uff08\u4f46\u901a\u5e38\u4e0d\u643a\u5e26\uff0c\u56e0\u4e3a\u8fde\u63a5\u521a\u5efa\u7acb\uff09\u3002<\/li><\/ul><\/li><li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u5ba2\u6237\u7aef\u8bf4\uff1a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684\u786e\u8ba4\u548c\u8d77\u59cb\u7f16\u53f7\uff08\u786e\u8ba4\u53f7Y+1\uff09\u3002\u597d\u7684\uff0c\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u6b63\u5f0f\u5f00\u59cb\u901a\u4fe1\u4e86\uff01\u201d<\/li><li><strong>\u670d\u52a1\u5668\u72b6\u6001\uff1a<\/strong> <code>SYN-RECEIVED<\/code> -> <code>ESTABLISHED<\/code><\/li><\/ul><img decoding=\"async\" src=\"\" alt=\"image-20251109172139189\"><\/li>\n<\/ol>\n\n\n\n<p><strong>\u4e3a\u4ec0\u4e48\u662f\u4e09\u6b21\u63e1\u624b\uff1f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\u7a81\u7136\u53c8\u4f20\u5230\u670d\u52a1\u5668\uff0c\u5bfc\u81f4\u9519\u8bef\u8fde\u63a5\u3002<\/strong> \u60f3\u8c61\u5ba2\u6237\u7aef\u53d1\u4e86\u4e2aSYN\uff0c\u4f46\u7f51\u7edc\u5ef6\u8fdf\u5f88\u4e45\u624d\u5230\u670d\u52a1\u5668\u3002\u5ba2\u6237\u7aef\u4ee5\u4e3a\u8d85\u65f6\u4e86\u5c31\u91cd\u53d1\u4e86\u4e00\u4e2a\uff0c\u5e76\u5efa\u7acb\u4e86\u65b0\u8fde\u63a5\u3002\u5982\u679c\u65e7\u7684SYN\u7a81\u7136\u53c8\u5230\u4e86\u670d\u52a1\u5668\uff0c\u670d\u52a1\u5668\u4f1a\u56de\u590dSYN-ACK\u3002\u5982\u679c\u53ea\u6709\u4e24\u6b21\u63e1\u624b\uff0c\u5ba2\u6237\u7aef\u6536\u5230\u8fd9\u4e2a\u65e7\u7684SYN-ACK\u540e\u4f1a\u8bef\u4ee5\u4e3a\u662f\u65b0\u8fde\u63a5\uff0c\u5bfc\u81f4\u9519\u8bef\u3002\u4e09\u6b21\u63e1\u624b\u786e\u4fdd\u5ba2\u6237\u7aef\u4f1a\u5ffd\u7565\u8fd9\u4e2a\u65e7\u7684SYN-ACK\uff0c\u56e0\u4e3a\u5b83\u4e0d\u662f\u5b83\u671f\u671b\u7684\u3002<\/li>\n\n\n\n<li><strong>\u786e\u4fdd\u53cc\u65b9\u90fd\u5177\u5907\u53d1\u9001\u548c\u63a5\u6536\u80fd\u529b\u3002<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u7b2c\u4e00\u6b21\u63e1\u624b\uff1a\u5ba2\u6237\u7aef\u80fd\u53d1\uff0c\u670d\u52a1\u5668\u80fd\u6536\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e8c\u6b21\u63e1\u624b\uff1a\u670d\u52a1\u5668\u80fd\u53d1\uff0c\u5ba2\u6237\u7aef\u80fd\u6536\u3002<\/li>\n\n\n\n<li>\u7b2c\u4e09\u6b21\u63e1\u624b\uff1a\u5ba2\u6237\u7aef\u80fd\u53d1\uff08\u786e\u8ba4\u670d\u52a1\u5668\u7684SYN\uff09\uff0c\u670d\u52a1\u5668\u80fd\u6536\uff08\u5ba2\u6237\u7aef\u7684ACK\uff09\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u4e09\u6b21\u786e\u8ba4\uff0c\u53cc\u65b9\u90fd\u660e\u786e\u5bf9\u65b9\u5df2\u51c6\u5907\u597d\u8fdb\u884c\u53cc\u5411\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u4e2d\u5bb9\u6613\u906d\u53d7\u7684\u653b\u51fb\u53ca\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/h3>\n\n\n\n<p><strong>\u653b\u51fb\u7c7b\u578b\uff1aSYN \u6d2a\u6cdb\u653b\u51fb (SYN Flood)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u653b\u51fb\u8fc7\u7a0b\uff1a<\/strong> \u653b\u51fb\u8005\u5411\u76ee\u6807\u670d\u52a1\u5668\u53d1\u9001\u5927\u91cf\u7684 <code>SYN<\/code> \u8bf7\u6c42\u62a5\u6587\u6bb5\uff0c\u4f46\u6536\u5230\u670d\u52a1\u5668\u7684 <code>SYN-ACK<\/code> \u54cd\u5e94\u540e\uff0c\u5374\u6545\u610f\u4e0d\u53d1\u9001\u7b2c\u4e09\u6b21\u63e1\u624b\u7684 <code>ACK<\/code> \u62a5\u6587\u6bb5\u6765\u5b8c\u6210\u8fde\u63a5\u3002\u653b\u51fb\u8005\u901a\u5e38\u4f1a\u4f2a\u9020\u6e90IP\u5730\u5740\uff0c\u4f7f\u5f97\u670d\u52a1\u5668\u7684 <code>SYN-ACK<\/code> \u65e0\u6cd5\u5230\u8fbe\u771f\u6b63\u7684\u5ba2\u6237\u7aef\uff0c\u6216\u8005\u5230\u8fbe\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u5730\u5740\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u539f\u7406\uff1a<\/strong> \u670d\u52a1\u5668\u5728\u6536\u5230 <code>SYN<\/code> \u5e76\u53d1\u9001 <code>SYN-ACK<\/code> \u540e\uff0c\u4f1a\u4e3a\u8fd9\u4e2a\u201c\u534a\u5f00\u8fde\u63a5\u201d\u5728\u5185\u5b58\u4e2d\u5206\u914d\u5e76\u7ef4\u62a4\u4e00\u4e2a<strong>\u8fde\u63a5\u72b6\u6001\u5757 (TCB - Transmission Control Block)<\/strong>\uff0c\u5e76\u5c06\u5176\u653e\u5165\u534a\u5f00\u8fde\u63a5\u961f\u5217\u3002\u5927\u91cf\u7684\u534a\u5f00\u8fde\u63a5\u4f1a\u8fc5\u901f\u8017\u5c3d\u670d\u52a1\u5668\u7684\u5185\u5b58\u548cCPU\u8d44\u6e90\uff0c\u5e76\u586b\u6ee1\u534a\u5f00\u8fde\u63a5\u961f\u5217\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u5f71\u54cd\uff1a<\/strong> \u5f53\u534a\u5f00\u8fde\u63a5\u961f\u5217\u6ee1\u8f7d\u65f6\uff0c\u670d\u52a1\u5668\u65e0\u6cd5\u5904\u7406\u65b0\u7684\u5408\u6cd5 <code>SYN<\/code> \u8bf7\u6c42\uff0c\u5bfc\u81f4\u771f\u6b63\u7684\u7528\u6237\u65e0\u6cd5\u5efa\u7acb\u8fde\u63a5\uff0c\u4ece\u800c\u9020\u6210<strong>\u62d2\u7edd\u670d\u52a1 (DoS\/DDoS)<\/strong>\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848\u53ca\u8be6\u7ec6\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>SYN Cookies (\u540c\u6b65\u5e8f\u5217\u53f7cookies)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u8fd9\u662f\u6700\u6709\u6548\u7684\u9632\u5fa1\u624b\u6bb5\u4e4b\u4e00\u3002\u5f53\u670d\u52a1\u5668\u6536\u5230\u5ba2\u6237\u7aef\u7684 <code>SYN<\/code> \u8bf7\u6c42\u65f6\uff0c\u5b83<strong>\u4e0d\u7acb\u5373\u5206\u914d\u8d44\u6e90<\/strong>\u3002\u76f8\u53cd\uff0c\u5b83\u4f1a\u6839\u636e\u5ba2\u6237\u7aef\u7684IP\u5730\u5740\u3001\u7aef\u53e3\u3001\u5ba2\u6237\u7aef\u7684\u521d\u59cb\u5e8f\u5217\u53f7 (<code>seq=X<\/code>)\u3001\u670d\u52a1\u5668\u7684IP\u5730\u5740\u3001\u7aef\u53e3\u4ee5\u53ca\u4e00\u4e2a\u79d8\u5bc6\u503c\uff0c\u901a\u8fc7\u52a0\u5bc6\u7b97\u6cd5\u8ba1\u7b97\u51fa\u4e00\u4e2a\u7279\u6b8a\u7684\u201c\u997c\u5e72\u201d\u503c\u3002\u8fd9\u4e2a\u201c\u997c\u5e72\u201d\u503c\u88ab\u7528\u4f5c\u670d\u52a1\u5668\u7684\u521d\u59cb\u5e8f\u5217\u53f7 (<code>seq=Y<\/code>)\uff0c\u5305\u542b\u5728 <code>SYN-ACK<\/code> \u62a5\u6587\u6bb5\u4e2d\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\u3002\u53ea\u6709\u5f53\u5ba2\u6237\u7aef\u56de\u590d\u4e86\u6b63\u786e\u7684 <code>ACK<\/code> \u62a5\u6587\u6bb5\uff08\u5176\u4e2d\u5305\u542b\u6b63\u786e\u7684\u786e\u8ba4\u53f7 <code>Y+1<\/code>\uff09\uff0c\u670d\u52a1\u5668\u624d\u4f1a\u6839\u636e\u8fd9\u4e2a\u786e\u8ba4\u53f7\u4e2d\u7684\u4fe1\u606f\uff0c<strong>\u91cd\u65b0\u8ba1\u7b97\u5e76\u9a8c\u8bc1\u201c\u997c\u5e72\u201d\uff08Cookies\uff09\u503c<\/strong>\u3002\u5982\u679c\u9a8c\u8bc1\u901a\u8fc7\uff0c\u670d\u52a1\u5668\u624d\u771f\u6b63\u4e3a\u8fd9\u4e2a\u8fde\u63a5\u5206\u914d\u8d44\u6e90\u5e76\u5efa\u7acb\u8fde\u63a5\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u901a\u8fc7\u5c06\u8fde\u63a5\u72b6\u6001\u4fe1\u606f\u7f16\u7801\u5230\u5e8f\u5217\u53f7\u4e2d\uff0c\u670d\u52a1\u5668\u5728\u6536\u5230 <code>SYN<\/code> \u65f6\u4fdd\u6301\u201c\u65e0\u72b6\u6001\u201d\uff0c\u4e0d\u5360\u7528\u4efb\u4f55\u5185\u5b58\u8d44\u6e90\u3002\u53ea\u6709\u5f53\u5ba2\u6237\u7aef\u5b8c\u6210\u7b2c\u4e09\u6b21\u63e1\u624b\u65f6\uff0c\u624d\u5206\u914d\u8d44\u6e90\u3002\u8fd9\u4f7f\u5f97\u653b\u51fb\u8005\u53d1\u9001\u518d\u591a\u7684 <code>SYN<\/code> \u5305\u4e5f\u65e0\u6cd5\u8017\u5c3d\u670d\u52a1\u5668\u7684\u8fde\u63a5\u961f\u5217\u548c\u5185\u5b58\uff0c\u56e0\u4e3a\u670d\u52a1\u5668\u5728\u6536\u5230 <code>ACK<\/code> \u4e4b\u524d\u6ca1\u6709\u4e3a\u8fd9\u4e9b\u8fde\u63a5\u5206\u914d\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>SYN Proxy (SYN \u4ee3\u7406)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u5728\u670d\u52a1\u5668\u524d\u7aef\u90e8\u7f72\u4e00\u4e2a\u4e13\u95e8\u7684\u4ee3\u7406\u8bbe\u5907\uff08\u5982\u9632\u706b\u5899\u3001\u8d1f\u8f7d\u5747\u8861\u5668\u6216DDoS\u9632\u62a4\u8bbe\u5907\uff09\u3002\u8fd9\u4e2a\u4ee3\u7406\u8bbe\u5907\u4f1a\u62e6\u622a\u6240\u6709\u7684 <code>SYN<\/code> \u8bf7\u6c42\u3002\u5b83\u4f1a\u4ee3\u66ff\u540e\u7aef\u670d\u52a1\u5668\u4e0e\u5ba2\u6237\u7aef\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3002\u53ea\u6709\u5f53\u4ee3\u7406\u8bbe\u5907\u6210\u529f\u4e0e\u5ba2\u6237\u7aef\u5efa\u7acb\u4e86\u5b8c\u6574\u7684TCP\u8fde\u63a5\u540e\uff0c\u5b83\u624d\u4f1a\u5411\u540e\u7aef\u670d\u52a1\u5668\u53d1\u9001\u4e00\u4e2a\u65b0\u7684 <code>SYN<\/code> \u8bf7\u6c42\uff0c\u5efa\u7acb\u7b2c\u4e8c\u4e2aTCP\u8fde\u63a5\uff0c\u5e76\u5c06\u5ba2\u6237\u7aef\u7684\u6d41\u91cf\u8f6c\u53d1\u7ed9\u540e\u7aef\u670d\u52a1\u5668\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u540e\u7aef\u670d\u52a1\u5668\u6c38\u8fdc\u4e0d\u4f1a\u76f4\u63a5\u66b4\u9732\u5728 <code>SYN<\/code> \u6d2a\u6cdb\u7684\u98ce\u9669\u4e2d\u3002\u4ee3\u7406\u8bbe\u5907\u627f\u62c5\u4e86\u5efa\u7acb\u8fde\u63a5\u7684\u5f00\u9500\u548c\u98ce\u9669\uff0c\u4fdd\u62a4\u4e86\u540e\u7aef\u670d\u52a1\u5668\u7684\u8d44\u6e90\u3002\u5373\u4f7f\u4ee3\u7406\u8bbe\u5907\u88ab\u653b\u51fb\uff0c\u540e\u7aef\u670d\u52a1\u4e5f\u80fd\u4fdd\u6301\u53ef\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u589e\u52a0\u534a\u5f00\u8fde\u63a5\u961f\u5217\u5927\u5c0f (Backlog Queue Size)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u8c03\u6574\u64cd\u4f5c\u7cfb\u7edf\u53c2\u6570\uff0c\u589e\u52a0\u670d\u52a1\u5668\u53ef\u4ee5\u540c\u65f6\u7ef4\u62a4\u7684\u534a\u5f00\u8fde\u63a5\uff08<code>SYN-RECEIVED<\/code> \u72b6\u6001\uff09\u7684\u6570\u91cf\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u8fd9\u662f\u4e00\u79cd\u4e34\u65f6\u7f13\u89e3\u63aa\u65bd\uff0c\u53ef\u4ee5\u5ef6\u7f13\u961f\u5217\u88ab\u586b\u6ee1\u7684\u65f6\u95f4\uff0c\u4e3a\u5176\u4ed6\u9632\u5fa1\u63aa\u65bd\u4e89\u53d6\u65f6\u95f4\u3002\u4f46\u5b83\u4e0d\u80fd\u4ece\u6839\u672c\u4e0a\u89e3\u51b3\u95ee\u9898\uff0c\u5982\u679c\u653b\u51fb\u6d41\u91cf\u8db3\u591f\u5927\uff0c\u961f\u5217\u6700\u7ec8\u8fd8\u662f\u4f1a\u88ab\u586b\u6ee1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8fde\u63a5\u901f\u7387\u9650\u5236 (Rate Limiting)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u5728\u9632\u706b\u5899\u3001\u8def\u7531\u5668\u6216\u670d\u52a1\u5668\u4e0a\u914d\u7f6e\uff0c\u9650\u5236\u4ece\u5355\u4e2aIP\u5730\u5740\u6216\u7279\u5b9aIP\u6bb5\u5728\u5355\u4f4d\u65f6\u95f4\u5185\u53d1\u8d77\u7684 <code>SYN<\/code> \u8bf7\u6c42\u6570\u91cf\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u53ef\u4ee5\u6709\u6548\u51cf\u7f13\u6765\u81ea\u975e\u4f2a\u9020IP\u5730\u5740\u7684 <code>SYN<\/code> \u6d2a\u6cdb\u653b\u51fb\u3002\u4f46\u5bf9\u4e8e\u4f2a\u9020\u6e90IP\u7684\u653b\u51fb\u6548\u679c\u6709\u9650\uff0c\u56e0\u4e3a\u6bcf\u4e2a\u4f2a\u9020IP\u53ef\u80fd\u53ea\u53d1\u9001\u5c11\u91cf\u8bf7\u6c42\uff0c\u4f46\u603b\u6570\u5de8\u5927\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u56db\u6b21\u6325\u624b \u65ad\u5f00\u53ef\u9760\u8fde\u63a5<\/strong><\/h3>\n\n\n\n<p><strong>\u76ee\u7684\uff1a<\/strong> \u4f18\u96c5\u5730\u7ec8\u6b62\u4e00\u4e2a\u5168\u53cc\u5de5\u7684TCP\u8fde\u63a5\uff0c\u786e\u4fdd\u53cc\u65b9\u6240\u6709\u5f85\u53d1\u9001\u7684\u6570\u636e\u90fd\u5df2\u4f20\u8f93\u5b8c\u6bd5\u5e76\u5f97\u5230\u786e\u8ba4\uff0c\u7136\u540e\u5b89\u5168\u5730\u91ca\u653e\u8fde\u63a5\u8d44\u6e90\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/ucc.alicdn.com\/sqwzxd2m3mcv6_20240819_34cb8e383dad4422b9f62a2dca6371fa.png?x-oss-process=image\/resize,w_1400\/format,webp\" alt=\"img\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/ucc.alicdn.com\/sqwzxd2m3mcv6_20240819_44a20a145e5b47238becf8755cc8ed0f.png?x-oss-process=image\/resize,w_1400\/format,webp\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure>\n\n\n\n<p><strong>\u8fc7\u7a0b\u8be6\u89e3\uff1a<\/strong><\/p>\n\n\n\n<p>TCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684\uff0c\u610f\u5473\u7740\u6570\u636e\u53ef\u4ee5\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u72ec\u7acb\u4f20\u8f93\u3002\u56e0\u6b64\uff0c\u5173\u95ed\u8fde\u63a5\u4e5f\u9700\u8981\u53cc\u65b9\u5404\u81ea\u72ec\u7acb\u5730\u5173\u95ed\u81ea\u5df1\u7684\u53d1\u9001\u901a\u9053\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7b2c\u4e00\u6b21\u6325\u624b (FIN)\uff1a\u53d1\u8d77\u65b9 -> \u63a5\u6536\u65b9<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u53d1\u8d77\u65b9\u72b6\u6001\uff1a<\/strong> <code>ESTABLISHED<\/code> -> <code>FIN-WAIT-1<\/code><\/li>\n\n\n\n<li><strong>\u53d1\u8d77\u65b9\u52a8\u4f5c\uff1a<\/strong> \u5f53\u4e00\u65b9\uff08\u4f8b\u5982\u5ba2\u6237\u7aef\uff09\u5b8c\u6210\u6240\u6709\u6570\u636e\u53d1\u9001\u540e\uff0c\u5b83\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>FIN (Finish)<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>FIN<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u5e8f\u5217\u53f7\uff0c\u4f8b\u5982 <code>seq=U<\/code> (U\u662f\u4e4b\u524d\u53d1\u9001\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u5217\u53f7+1)\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u5ba2\u6237\u7aef\u8bf4\uff1a\u201c\u6211\u8fd9\u8fb9\u7684\u6570\u636e\u90fd\u53d1\u5b8c\u4e86\uff0c\u6211\u51c6\u5907\u5173\u95ed\u6211\u7684\u53d1\u9001\u901a\u9053\u4e86\u3002\u6211\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u662fU\u3002\u201d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e8c\u6b21\u6325\u624b (ACK)\uff1a\u63a5\u6536\u65b9 -> \u53d1\u8d77\u65b9<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u63a5\u6536\u65b9\u72b6\u6001\uff1a<\/strong> <code>ESTABLISHED<\/code> -> <code>CLOSE-WAIT<\/code><\/li>\n\n\n\n<li><strong>\u63a5\u6536\u65b9\u52a8\u4f5c\uff1a<\/strong> \u63a5\u6536\u65b9\u6536\u5230\u53d1\u8d77\u65b9\u7684 <code>FIN<\/code> \u540e\uff0c\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>ACK<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>ACK<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u53f7 (ack)<\/strong> \u8bbe\u7f6e\u4e3a <code>U + 1<\/code>\uff0c\u8868\u793a\u5df2\u6210\u529f\u6536\u5230\u53d1\u8d77\u65b9\u7684 <code>FIN<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u670d\u52a1\u5668\u8bf4\uff1a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684\u5173\u95ed\u8bf7\u6c42\uff08\u786e\u8ba4\u53f7U+1\uff09\u3002\u597d\u7684\uff0c\u6211\u77e5\u9053\u4f60\u4e0d\u518d\u53d1\u9001\u6570\u636e\u4e86\u3002\u201d<\/li>\n\n\n\n<li><strong>\u6ce8\u610f\uff1a<\/strong> \u6b64\u65f6\uff0c\u63a5\u6536\u65b9\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u8981\u53d1\u9001\u7ed9\u53d1\u8d77\u65b9\uff0c\u6240\u4ee5\u8fde\u63a5\u4ecd\u5904\u4e8e\u534a\u5173\u95ed\u72b6\u6001\uff08\u63a5\u6536\u65b9\u4ecd\u53ef\u53d1\u9001\u6570\u636e\uff0c\u53d1\u8d77\u65b9\u4ecd\u53ef\u63a5\u6536\u6570\u636e\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u4e09\u6b21\u6325\u624b (FIN-ACK)\uff1a\u63a5\u6536\u65b9 -> \u53d1\u8d77\u65b9<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u63a5\u6536\u65b9\u72b6\u6001\uff1a<\/strong> <code>CLOSE-WAIT<\/code> -> <code>LAST-ACK<\/code><\/li>\n\n\n\n<li><strong>\u63a5\u6536\u65b9\u52a8\u4f5c\uff1a<\/strong> \u5f53\u63a5\u6536\u65b9\u4e5f\u5b8c\u6210\u6240\u6709\u6570\u636e\u53d1\u9001\u540e\uff0c\u5b83\u4e5f\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>FIN-ACK<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>FIN<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li><code>ACK<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li>\u643a\u5e26\u4e00\u4e2a\u5e8f\u5217\u53f7\uff0c\u4f8b\u5982 <code>seq=V<\/code> (V\u662f\u670d\u52a1\u5668\u4e4b\u524d\u53d1\u9001\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u5217\u53f7+1)\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u53f7 (ack)<\/strong> \u4ecd\u4e3a <code>U + 1<\/code> (\u6216\u66f4\u65b0\u4e3a <code>U+1<\/code>\uff0c\u5982\u679c\u4e4b\u524d\u6709\u6570\u636e\u53d1\u9001)\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u670d\u52a1\u5668\u8bf4\uff1a\u201c\u6211\u8fd9\u8fb9\u7684\u6570\u636e\u4e5f\u53d1\u5b8c\u4e86\uff0c\u6211\u4e5f\u51c6\u5907\u5173\u95ed\u6211\u7684\u53d1\u9001\u901a\u9053\u4e86\u3002\u6211\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u662fV\u3002\u201d<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7b2c\u56db\u6b21\u6325\u624b (ACK)\uff1a\u53d1\u8d77\u65b9 -> \u63a5\u6536\u65b9<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u53d1\u8d77\u65b9\u72b6\u6001\uff1a<\/strong> <code>FIN-WAIT-2<\/code> -> <code>TIME-WAIT<\/code><\/li>\n\n\n\n<li><strong>\u53d1\u8d77\u65b9\u52a8\u4f5c\uff1a<\/strong> \u53d1\u8d77\u65b9\u6536\u5230\u63a5\u6536\u65b9\u7684 <code>FIN<\/code> \u540e\uff0c\u4f1a\u53d1\u9001\u4e00\u4e2a <strong>ACK<\/strong> \u62a5\u6587\u6bb5\u3002\n<ul class=\"wp-block-list\">\n<li><code>ACK<\/code> \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u53f7 (ack)<\/strong> \u8bbe\u7f6e\u4e3a <code>V + 1<\/code>\uff0c\u8868\u793a\u5df2\u6210\u529f\u6536\u5230\u63a5\u6536\u65b9\u7684 <code>FIN<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u7406\u89e3\uff1a<\/strong> \u5ba2\u6237\u7aef\u8bf4\uff1a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684\u5173\u95ed\u8bf7\u6c42\uff08\u786e\u8ba4\u53f7V+1\uff09\u3002\u597d\u7684\uff0c\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u5f7b\u5e95\u65ad\u5f00\u8fde\u63a5\u4e86\uff01\u201d<\/li>\n\n\n\n<li><strong>\u63a5\u6536\u65b9\u72b6\u6001\uff1a<\/strong> <code>LAST-ACK<\/code> -> <code>CLOSED<\/code> (\u6536\u5230\u6700\u540e\u4e00\u4e2aACK\u540e)<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u4e3a\u4ec0\u4e48\u662f\u56db\u6b21\u6325\u624b\uff1f<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5168\u53cc\u5de5\u7279\u6027\uff1a<\/strong> TCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684\uff0c\u610f\u5473\u7740\u6bcf\u4e2a\u65b9\u5411\u7684\u6570\u636e\u6d41\u90fd\u662f\u72ec\u7acb\u7684\u3002\u5f53\u4e00\u65b9\u5b8c\u6210\u53d1\u9001\u540e\uff0c\u5b83\u53ea\u80fd\u5173\u95ed\u81ea\u5df1\u7684\u53d1\u9001\u901a\u9053\uff0c\u800c\u4e0d\u80fd\u5f3a\u5236\u5173\u95ed\u5bf9\u65b9\u7684\u53d1\u9001\u901a\u9053\u3002\u5bf9\u65b9\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u8981\u53d1\u9001\u3002<\/li>\n\n\n\n<li><strong>\u72ec\u7acb\u5173\u95ed\uff1a<\/strong> \u7b2c\u4e00\u6b21 <code>FIN<\/code> + <code>ACK<\/code> \u5173\u95ed\u4e86\u4ece\u53d1\u8d77\u65b9\u5230\u63a5\u6536\u65b9\u7684\u6570\u636e\u6d41\u3002\u7b2c\u4e8c\u6b21 <code>FIN<\/code> + <code>ACK<\/code> \u5173\u95ed\u4e86\u4ece\u63a5\u6536\u65b9\u5230\u53d1\u8d77\u65b9\u7684\u6570\u636e\u6d41\u3002\u53ea\u6709\u53cc\u65b9\u90fd\u660e\u786e\u8868\u793a\u4e0d\u518d\u53d1\u9001\u6570\u636e\u5e76\u6536\u5230\u5bf9\u65b9\u7684\u786e\u8ba4\uff0c\u8fde\u63a5\u624d\u80fd\u5b8c\u5168\u5173\u95ed\u3002<\/li>\n\n\n\n<li><strong>TIME_WAIT \u72b6\u6001\uff1a<\/strong> \u53d1\u8d77\u65b9\u5728\u53d1\u9001\u5b8c\u6700\u540e\u4e00\u4e2a <code>ACK<\/code> \u540e\uff0c\u4f1a\u8fdb\u5165\u4e00\u4e2a <code>TIME-WAIT<\/code> \u72b6\u6001\uff0c\u5e76\u6301\u7eed\u4e00\u6bb5\u65f6\u95f4\uff08\u901a\u5e38\u662f2MSL\uff0c\u5373\u6700\u957f\u62a5\u6587\u6bb5\u5bff\u547d\u7684\u4e24\u500d\uff09\u3002\n<ul class=\"wp-block-list\">\n<li><strong>\u4f5c\u75281\uff1a<\/strong> \u786e\u4fdd\u6700\u540e\u4e00\u4e2a <code>ACK<\/code> \u62a5\u6587\u6bb5\u80fd\u591f\u5230\u8fbe\u63a5\u6536\u65b9\u3002\u5982\u679c <code>ACK<\/code> \u4e22\u5931\uff0c\u63a5\u6536\u65b9\u4f1a\u91cd\u4f20 <code>FIN<\/code>\uff0c\u53d1\u8d77\u65b9\u53ef\u4ee5\u5728 <code>TIME-WAIT<\/code> \u72b6\u6001\u4e0b\u91cd\u65b0\u53d1\u9001 <code>ACK<\/code>\u3002<\/li>\n\n\n\n<li><strong>\u4f5c\u75282\uff1a<\/strong> \u786e\u4fdd\u5f53\u524d\u8fde\u63a5\u7684\u6240\u6709\u62a5\u6587\u6bb5\u90fd\u5df2\u5728\u7f51\u7edc\u4e2d\u6d88\u5931\u3002\u8fd9\u53ef\u4ee5\u9632\u6b62\u65e7\u8fde\u63a5\u4e2d\u5ef6\u8fdf\u5230\u8fbe\u7684\u62a5\u6587\u6bb5\u88ab\u8bef\u8ba4\u4e3a\u662f\u65b0\u8fde\u63a5\u7684\u62a5\u6587\u6bb5\uff0c\u4ece\u800c\u907f\u514d\u6570\u636e\u6df7\u4e71\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u56db\u6b21\u6325\u624b\u8fc7\u7a0b\u4e2d\u5bb9\u6613\u906d\u53d7\u7684\u653b\u51fb\u53ca\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/h3>\n\n\n\n<p><strong>\u653b\u51fb\u7c7b\u578b1\uff1aTCP \u91cd\u7f6e\u653b\u51fb (TCP Reset Attack \/ RST Attack)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u653b\u51fb\u8fc7\u7a0b\uff1a<\/strong> \u653b\u51fb\u8005\u55c5\u63a2\u6b63\u5728\u8fdb\u884c\u7684TCP\u8fde\u63a5\uff0c\u83b7\u53d6\u5230\u8fde\u63a5\u53cc\u65b9\u7684IP\u5730\u5740\u3001\u7aef\u53e3\u53f7\u4ee5\u53ca\u5f53\u524d\u7684\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\u3002\u7136\u540e\uff0c\u653b\u51fb\u8005\u4f2a\u9020\u4e00\u4e2a <code>RST<\/code> (Reset) \u62a5\u6587\u6bb5\uff0c\u5176\u4e2d\u5305\u542b\u6b63\u786e\u7684\u6e90IP\u3001\u76ee\u7684IP\u3001\u6e90\u7aef\u53e3\u3001\u76ee\u7684\u7aef\u53e3\uff0c\u4ee5\u53ca\u6700\u91cd\u8981\u7684\u2014\u2014<strong>\u6b63\u786e\u7684\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7<\/strong>\u3002\u5c06\u8fd9\u4e2a\u4f2a\u9020\u7684 <code>RST<\/code> \u5305\u53d1\u9001\u7ed9\u8fde\u63a5\u7684\u4efb\u610f\u4e00\u65b9\uff08\u901a\u5e38\u662f\u5ba2\u6237\u7aef\u6216\u670d\u52a1\u5668\uff09\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u539f\u7406\uff1a<\/strong> TCP\u534f\u8bae\u89c4\u5b9a\uff0c\u6536\u5230\u4e00\u4e2a\u5e26\u6709\u6b63\u786e\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\u7684 <code>RST<\/code> \u62a5\u6587\u6bb5\u65f6\uff0c\u63a5\u6536\u65b9\u4f1a\u7acb\u5373\u7ec8\u6b62\u5f53\u524d\u7684TCP\u8fde\u63a5\uff0c\u4e0d\u8fdb\u884c\u4efb\u4f55\u786e\u8ba4\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u5f71\u54cd\uff1a<\/strong> \u5f3a\u5236\u4e2d\u65ad\u6b63\u5728\u8fdb\u884c\u7684\u5408\u6cd5TCP\u8fde\u63a5\uff0c\u5bfc\u81f4\u7528\u6237\u4e0b\u8f7d\u4e2d\u65ad\u3001\u7f51\u9875\u52a0\u8f7d\u5931\u8d25\u3001\u5728\u7ebf\u6e38\u620f\u6389\u7ebf\u7b49\uff0c\u8fd9\u662f\u4e00\u79cd\u6709\u6548\u7684<strong>\u62d2\u7edd\u670d\u52a1\u653b\u51fb<\/strong>\u624b\u6bb5\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848\u53ca\u8be6\u7ec6\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u4f7f\u7528\u52a0\u5bc6\u901a\u4fe1 (TLS\/SSL\/VPN)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u5f53\u4f7f\u7528TLS\/SSL\uff08\u5982HTTPS\uff09\u6216VPN\u65f6\uff0c\u6240\u6709\u6570\u636e\uff08\u5305\u62ecTCP\u7684\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\uff09\u90fd\u4f1a\u88ab\u52a0\u5bc6\u3002\u653b\u51fb\u8005\u5373\u4f7f\u55c5\u63a2\u5230\u6d41\u91cf\uff0c\u4e5f\u65e0\u6cd5\u83b7\u53d6\u5230\u771f\u5b9e\u7684\u3001\u672a\u52a0\u5bc6\u7684\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\u3002\u56e0\u6b64\uff0c\u653b\u51fb\u8005\u65e0\u6cd5\u6784\u9020\u51fa\u5e26\u6709\u6b63\u786e\u5e8f\u5217\u53f7\u548c\u786e\u8ba4\u53f7\u7684\u4f2a\u9020 <code>RST<\/code> \u62a5\u6587\u6bb5\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> <code>RST<\/code> \u653b\u51fb\u4f9d\u8d56\u4e8e\u5bf9TCP\u5e8f\u5217\u53f7\u7684\u9884\u6d4b\u6216\u55c5\u63a2\u3002\u52a0\u5bc6\u4f7f\u5f97\u8fd9\u4e9b\u5173\u952e\u4fe1\u606f\u5bf9\u653b\u51fb\u8005\u4e0d\u53ef\u89c1\uff0c\u4ece\u800c\u4f7f\u5176\u65e0\u6cd5\u6210\u529f\u4f2a\u9020\u6709\u6548\u7684 <code>RST<\/code> \u5305\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u9632\u706b\u5899\/\u5165\u4fb5\u68c0\u6d4b\u7cfb\u7edf (IDS\/IPS) \u6df1\u5ea6\u5305\u68c0\u6d4b<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u914d\u7f6e\u9632\u706b\u5899\u6216IDS\/IPS\uff0c\u5bf9\u7ecf\u8fc7\u7684\u6d41\u91cf\u8fdb\u884c\u6df1\u5ea6\u5305\u68c0\u6d4b\u3002\u5b83\u4eec\u53ef\u4ee5\u8ddf\u8e2aTCP\u8fde\u63a5\u7684\u72b6\u6001\u3002\u5982\u679c\u6536\u5230\u4e00\u4e2a <code>RST<\/code> \u62a5\u6587\u6bb5\uff0c\u4f46\u5176\u5e8f\u5217\u53f7\u6216\u786e\u8ba4\u53f7\u4e0d\u7b26\u5408\u5f53\u524d\u8fde\u63a5\u7684\u9884\u671f\u72b6\u6001\uff0c\u6216\u8005\u5176\u6e90IP\/\u7aef\u53e3\u4e0e\u5df2\u5efa\u7acb\u8fde\u63a5\u7684\u5bf9\u7aef\u4e0d\u5339\u914d\uff0c\u5219\u5c06\u5176\u89c6\u4e3a\u5f02\u5e38\u5e76\u4e22\u5f03\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u5408\u6cd5\u7684 <code>RST<\/code> \u901a\u5e38\u53ea\u5728\u8fde\u63a5\u51fa\u73b0\u4e25\u91cd\u9519\u8bef\u65f6\u7531\u8fde\u63a5\u7684\u5bf9\u7aef\u53d1\u9001\u3002IDS\/IPS\u53ef\u4ee5\u901a\u8fc7\u5206\u6790 <code>RST<\/code> \u5305\u7684\u4e0a\u4e0b\u6587\u548c\u5185\u5bb9\uff0c\u8bc6\u522b\u51fa\u4f2a\u9020\u7684\u3001\u4e0d\u7b26\u5408\u534f\u8bae\u89c4\u8303\u7684 <code>RST<\/code> \u653b\u51fb\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u653b\u51fb\u7c7b\u578b2\uff1aFIN \u6d2a\u6cdb\u653b\u51fb (FIN Flood)<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u653b\u51fb\u8fc7\u7a0b\uff1a<\/strong> \u653b\u51fb\u8005\u5411\u76ee\u6807\u670d\u52a1\u5668\u53d1\u9001\u5927\u91cf\u7684 <code>FIN<\/code> \u62a5\u6587\u6bb5\uff0c\u8bf7\u6c42\u5173\u95ed\u8fde\u63a5\u3002\u8fd9\u7c7b\u4f3c\u4e8e <code>SYN<\/code> \u6d2a\u6cdb\uff0c\u4f46\u9488\u5bf9\u7684\u662f\u8fde\u63a5\u7ec8\u6b62\u9636\u6bb5\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u539f\u7406\uff1a<\/strong> \u670d\u52a1\u5668\u6536\u5230 <code>FIN<\/code> \u540e\uff0c\u9700\u8981\u67e5\u627e\u5bf9\u5e94\u7684\u8fde\u63a5\uff0c\u5e76\u5c06\u5176\u72b6\u6001\u4ece <code>ESTABLISHED<\/code> \u8f6c\u79fb\u5230 <code>CLOSE-WAIT<\/code>\uff0c\u7136\u540e\u6700\u7ec8\u5230 <code>CLOSED<\/code>\u3002\u5982\u679c\u653b\u51fb\u8005\u53d1\u9001\u5927\u91cf <code>FIN<\/code> \u5305\uff0c\u670d\u52a1\u5668\u53ef\u80fd\u9700\u8981\u6d88\u8017\u5927\u91cfCPU\u548c\u5185\u5b58\u8d44\u6e90\u6765\u5904\u7406\u8fd9\u4e9b\u5173\u95ed\u8bf7\u6c42\uff0c\u5c24\u5176\u662f\u5728\u7ef4\u62a4\u5927\u91cf <code>TIME-WAIT<\/code> \u72b6\u6001\u7684\u8fde\u63a5\u65f6\u3002<\/li>\n\n\n\n<li><strong>\u653b\u51fb\u5f71\u54cd\uff1a<\/strong> \u53ef\u80fd\u5bfc\u81f4\u670d\u52a1\u5668\u8d44\u6e90\u8017\u5c3d\uff0c\u5f71\u54cd\u670d\u52a1\u5668\u6027\u80fd\uff0c\u751a\u81f3\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>\u89e3\u51b3\u65b9\u6848\u53ca\u8be6\u7ec6\u89e3\u91ca\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u901f\u7387\u9650\u5236 (Rate Limiting)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u5728\u9632\u706b\u5899\u6216\u8d1f\u8f7d\u5747\u8861\u5668\u4e0a\u914d\u7f6e\uff0c\u9650\u5236\u5355\u4e2aIP\u5730\u5740\u6216\u7279\u5b9aIP\u6bb5\u5728\u5355\u4f4d\u65f6\u95f4\u5185\u53d1\u9001\u7684 <code>FIN<\/code> \u62a5\u6587\u6bb5\u6570\u91cf\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u51cf\u5c11\u6076\u610f <code>FIN<\/code> \u62a5\u6587\u6bb5\u5bf9\u670d\u52a1\u5668\u7684\u51b2\u51fb\uff0c\u4f7f\u5176\u65e0\u6cd5\u5728\u77ed\u65f6\u95f4\u5185\u5904\u7406\u8fc7\u591a\u7684\u5173\u95ed\u8bf7\u6c42\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8fde\u63a5\u72b6\u6001\u8ddf\u8e2a (Connection State Tracking)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u9632\u706b\u5899\u6216IPS\u53ef\u4ee5\u7ef4\u62a4\u6240\u6709TCP\u8fde\u63a5\u7684\u72b6\u6001\u8868\u3002\u53ea\u5141\u8bb8\u9488\u5bf9\u5df2\u5efa\u7acb\u7684\u3001\u6d3b\u8dc3\u7684TCP\u8fde\u63a5\u53d1\u9001 <code>FIN<\/code> \u62a5\u6587\u6bb5\u3002\u5bf9\u4e8e\u90a3\u4e9b\u6ca1\u6709\u5bf9\u5e94\u6d3b\u8dc3\u8fde\u63a5\u7684 <code>FIN<\/code> \u62a5\u6587\u6bb5\uff0c\u76f4\u63a5\u4e22\u5f03\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u5927\u90e8\u5206 <code>FIN<\/code> \u6d2a\u6cdb\u653b\u51fb\u4f1a\u53d1\u9001\u9488\u5bf9\u4e0d\u5b58\u5728\u6216\u5df2\u5173\u95ed\u8fde\u63a5\u7684 <code>FIN<\/code> \u5305\u3002\u901a\u8fc7\u72b6\u6001\u8ddf\u8e2a\uff0c\u53ef\u4ee5\u6709\u6548\u8fc7\u6ee4\u6389\u8fd9\u4e9b\u65e0\u6548\u7684\u653b\u51fb\u6d41\u91cf\uff0c\u51cf\u8f7b\u670d\u52a1\u5668\u7684\u8d1f\u62c5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8c03\u6574 <code>TIME_WAIT<\/code> \u72b6\u6001\u65f6\u95f4 (\u8c28\u614e\u4f7f\u7528)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u539f\u7406\uff1a<\/strong> \u5728\u67d0\u4e9b\u64cd\u4f5c\u7cfb\u7edf\uff08\u5982Linux\uff09\u4e2d\uff0c\u53ef\u4ee5\u8c03\u6574 <code>TIME_WAIT<\/code> \u72b6\u6001\u7684\u6301\u7eed\u65f6\u95f4\uff08\u4f8b\u5982\u901a\u8fc7 <code>net.ipv4.tcp_fin_timeout<\/code> \u53c2\u6570\uff09\u3002\u5c06\u5176\u7f29\u77ed\u53ef\u4ee5\u66f4\u5feb\u5730\u91ca\u653e\u7aef\u53e3\u8d44\u6e90\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\u89e3\u91ca\uff1a<\/strong> \u7f29\u77ed <code>TIME_WAIT<\/code> \u65f6\u95f4\u53ef\u4ee5\u66f4\u5feb\u5730\u56de\u6536\u8d44\u6e90\uff0c\u4ece\u800c\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u7f13\u89e3\u56e0\u5927\u91cf <code>FIN<\/code> \u5bfc\u81f4 <code>TIME_WAIT<\/code> \u72b6\u6001\u8fde\u63a5\u8fc7\u591a\u800c\u8017\u5c3d\u8d44\u6e90\u7684\u95ee\u9898\u3002<strong>\u4f46\u8bf7\u6ce8\u610f\uff0c\u8fd9\u662f\u4e00\u79cd\u6743\u8861\uff0c\u7f29\u77ed <code>TIME_WAIT<\/code> \u53ef\u80fd\u4f1a\u589e\u52a0\u65e7\u6570\u636e\u5305\u5e72\u6270\u65b0\u8fde\u63a5\u7684\u98ce\u9669\uff0c\u56e0\u6b64\u9700\u8c28\u614e\u8bc4\u4f30\u548c\u6d4b\u8bd5\u3002<\/strong><\/li>\n\n\n\n<li><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\">\u5907\u6ce8<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>SYN<\/strong>\uff1a\u7b80\u5199\u4e3a<code>S<\/code>\uff0c\u540c\u6b65\u6807\u5fd7\u4f4d\uff0c\u7528\u4e8e\u5efa\u7acb\u4f1a\u8bdd\u8fde\u63a5\uff0c\u540c\u6b65\u5e8f\u5217\u53f7\uff1b<\/li>\n\n\n\n<li><strong>ACK<\/strong>\uff1a \u7b80\u5199\u4e3a<code>.<\/code>\uff0c\u786e\u8ba4\u6807\u5fd7\u4f4d\uff0c\u5bf9\u5df2\u63a5\u6536\u7684\u6570\u636e\u5305\u8fdb\u884c\u786e\u8ba4\uff1b<\/li>\n\n\n\n<li><strong>FIN<\/strong>\uff1a \u7b80\u5199\u4e3a<code>F<\/code>\uff0c\u5b8c\u6210\u6807\u5fd7\u4f4d\uff0c\u8868\u793a\u6211\u5df2\u7ecf\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u4e86\uff0c\u5373\u5c06\u5173\u95ed\u8fde\u63a5\uff1b<\/li>\n\n\n\n<li><em>PSH<\/em>\uff1a\u7b80\u5199\u4e3a<code>P<\/code>\uff0c\u63a8\u9001\u6807\u5fd7\u4f4d\uff0c\u8868\u793a\u8be5\u6570\u636e\u5305\u88ab\u5bf9\u65b9\u63a5\u6536\u540e\u5e94\u7acb\u5373\u4ea4\u7ed9\u4e0a\u5c42\u5e94\u7528\uff0c\u800c\u4e0d\u5728\u7f13\u51b2\u533a\u6392\u961f\uff1b<\/li>\n\n\n\n<li><em>RST<\/em>\uff1a\u7b80\u5199\u4e3a<code>R<\/code>\uff0c\u91cd\u7f6e\u6807\u5fd7\u4f4d\uff0c\u7528\u4e8e\u8fde\u63a5\u590d\u4f4d\u3001\u62d2\u7edd\u9519\u8bef\u548c\u975e\u6cd5\u7684\u6570\u636e\u5305\uff1b<\/li>\n\n\n\n<li><em>URG<\/em>\uff1a\u7b80\u5199\u4e3a<code>U<\/code>\uff0c\u7d27\u6025\u6807\u5fd7\u4f4d\uff0c\u8868\u793a\u6570\u636e\u5305\u7684\u7d27\u6025\u6307\u9488\u57df\u6709\u6548\uff0c\u7528\u6765\u4fdd\u8bc1\u8fde\u63a5\u4e0d\u88ab\u963b\u65ad\uff0c\u5e76\u7763\u4fc3\u4e2d\u95f4\u8bbe\u5907\u5c3d\u5feb\u5904\u7406\uff1b<\/li>\n\n\n\n<li><img decoding=\"async\" src=\"\" alt=\"image-20251109180954866\"><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">OSI\u4e03\u5c42\u53c2\u8003\u6a21\u578b\u53ca\u5176\u6bcf\u4e00\u5c42\u5e38\u89c1\u7aef\u53e3<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">TCP UDP\uff08\u4f20\u8f93\u5c42\uff09 \u5206\u522b\u662f\u4ec0\u4e48\uff1f\u533a\u522b\uff1f\u54ea\u4e2a\u66f4\u5b89\u5168<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>TCP<\/strong><\/h3>\n\n\n\n<p><strong>(Transmission Control Protocol) - \u4f20\u8f93\u63a7\u5236\u534f\u8bae<\/strong><\/p>\n\n\n\n<p><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u60f3\u8c61\u4f60\u7ed9\u670b\u53cb\u5bc4\u4e00\u5c01\u975e\u5e38\u91cd\u8981\u7684\u4fe1\u4ef6\u3002\u4f60\u4e0d\u4ec5\u8981\u786e\u4fdd\u4fe1\u4ef6\u80fd\u5bc4\u5230\uff0c\u8fd8\u8981\u786e\u8ba4\u670b\u53cb\u6536\u5230\u4e86\uff0c\u5e76\u4e14\u4fe1\u4ef6\u5185\u5bb9\u5b8c\u6574\u65e0\u7f3a\uff0c\u987a\u5e8f\u6b63\u786e\u3002\u5982\u679c\u670b\u53cb\u6ca1\u6536\u5230\u6216\u4fe1\u4ef6\u7834\u635f\uff0c\u4f60\u4f1a\u91cd\u65b0\u5bc4\u9001\u3002<\/p>\n\n\n\n<p><strong>\u6838\u5fc3\u7279\u70b9\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9762\u5411\u8fde\u63a5 (Connection-Oriented)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5728\u6570\u636e\u4f20\u8f93\u4e4b\u524d\uff0cTCP\u9700\u8981\u901a\u8fc7<strong>\u4e09\u6b21\u63e1\u624b<\/strong>\u5efa\u7acb\u4e00\u4e2a\u903b\u8f91\u8fde\u63a5\u3002<\/li>\n\n\n\n<li>\u5728\u6570\u636e\u4f20\u8f93\u7ed3\u675f\u540e\uff0c\u9700\u8981\u901a\u8fc7<strong>\u56db\u6b21\u6325\u624b<\/strong>\u65ad\u5f00\u8fde\u63a5\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\uff1a<\/strong> \u5efa\u7acb\u8fde\u63a5\u662f\u4e3a\u4e86\u521d\u59cb\u5316\u8fde\u63a5\u53c2\u6570\uff08\u5982\u5e8f\u5217\u53f7\uff09\uff0c\u5e76\u786e\u4fdd\u53cc\u65b9\u90fd\u51c6\u5907\u597d\u8fdb\u884c\u901a\u4fe1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u53ef\u9760\u4f20\u8f93 (Reliable)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>TCP\u4fdd\u8bc1\u6570\u636e\u80fd\u591f<strong>\u51c6\u786e\u65e0\u8bef\u3001\u4e0d\u4e22\u5931\u3001\u4e0d\u91cd\u590d\u3001\u6309\u987a\u5e8f<\/strong>\u5730\u5230\u8fbe\u76ee\u7684\u5730\u3002<\/li>\n\n\n\n<li>\u5b9e\u73b0\u673a\u5236\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u5e8f\u5217\u53f7 (Sequence Numbers)\uff1a<\/strong> \u6bcf\u4e2aTCP\u62a5\u6587\u6bb5\u90fd\u6709\u4e00\u4e2a\u5e8f\u5217\u53f7\uff0c\u7528\u4e8e\u6807\u8bc6\u62a5\u6587\u6bb5\u4e2d\u7684\u6570\u636e\u5b57\u8282\u6d41\uff0c\u786e\u4fdd\u6570\u636e\u6309\u5e8f\u5230\u8fbe\u548c\u91cd\u7ec4\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u5e94\u7b54 (Acknowledgments - ACK)\uff1a<\/strong> \u63a5\u6536\u65b9\u6536\u5230\u6570\u636e\u540e\u4f1a\u53d1\u9001\u786e\u8ba4\u5e94\u7b54\uff0c\u544a\u77e5\u53d1\u9001\u65b9\u5df2\u6536\u5230\u54ea\u4e9b\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u8d85\u65f6\u91cd\u4f20 (Retransmission)\uff1a<\/strong> \u5982\u679c\u53d1\u9001\u65b9\u5728\u4e00\u5b9a\u65f6\u95f4\u5185\u6ca1\u6709\u6536\u5230\u786e\u8ba4\u5e94\u7b54\uff0c\u5c31\u4f1a\u8ba4\u4e3a\u6570\u636e\u4e22\u5931\uff0c\u5e76\u91cd\u65b0\u53d1\u9001\u3002<\/li>\n\n\n\n<li><strong>\u6821\u9a8c\u548c (Checksum)\uff1a<\/strong> \u68c0\u67e5\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u662f\u5426\u635f\u574f\u3002<\/li>\n\n\n\n<li><strong>\u6d41\u91cf\u63a7\u5236 (Flow Control)\uff1a<\/strong> \u4f7f\u7528\u201c\u6ed1\u52a8\u7a97\u53e3\u201d\u673a\u5236\uff0c\u9632\u6b62\u53d1\u9001\u65b9\u53d1\u9001\u6570\u636e\u8fc7\u5feb\uff0c\u5bfc\u81f4\u63a5\u6536\u65b9\u6765\u4e0d\u53ca\u5904\u7406\u800c\u6ea2\u51fa\u3002<\/li>\n\n\n\n<li><strong>\u62e5\u585e\u63a7\u5236 (Congestion Control)\uff1a<\/strong> \u907f\u514d\u5411\u7f51\u7edc\u4e2d\u6ce8\u5165\u8fc7\u591a\u6570\u636e\uff0c\u5bfc\u81f4\u7f51\u7edc\u62e5\u5835\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5168\u53cc\u5de5\u901a\u4fe1 (Full-Duplex)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u6570\u636e\u53ef\u4ee5\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u540c\u65f6\u4f20\u8f93\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u57fa\u4e8e\u5b57\u8282\u6d41 (Byte Stream)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>TCP\u4e0d\u5173\u5fc3\u5e94\u7528\u7a0b\u5e8f\u53d1\u9001\u7684\u6570\u636e\u5757\u5927\u5c0f\uff0c\u5b83\u5c06\u5e94\u7528\u7a0b\u5e8f\u6570\u636e\u89c6\u4e3a\u4e00\u4e32\u65e0\u7ed3\u6784\u7684\u5b57\u8282\u6d41\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u8fdb\u884c\u5206\u6bb5\u53d1\u9001\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u9002\u7528\u573a\u666f\uff1a<\/strong> \u5bf9\u6570\u636e\u5b8c\u6574\u6027\u3001\u987a\u5e8f\u548c\u53ef\u9760\u6027\u8981\u6c42\u9ad8\u7684\u5e94\u7528\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Web \u6d4f\u89c8 (HTTP\/HTTPS)\uff1a<\/strong> \u786e\u4fdd\u7f51\u9875\u5185\u5bb9\u5b8c\u6574\u52a0\u8f7d\u3002<\/li>\n\n\n\n<li><strong>\u6587\u4ef6\u4f20\u8f93 (FTP)\uff1a<\/strong> \u786e\u4fdd\u6587\u4ef6\u4f20\u8f93\u65e0\u8bef\u3002<\/li>\n\n\n\n<li><strong>\u7535\u5b50\u90ae\u4ef6 (SMTP\/POP3\/IMAP)\uff1a<\/strong> \u786e\u4fdd\u90ae\u4ef6\u5185\u5bb9\u5b8c\u6574\u3002<\/li>\n\n\n\n<li><strong>\u5b89\u5168\u5916\u58f3 (SSH)\uff1a<\/strong> \u786e\u4fdd\u8fdc\u7a0b\u63a7\u5236\u547d\u4ee4\u51c6\u786e\u65e0\u8bef\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>UDP<\/strong><\/h3>\n\n\n\n<p><strong>(User Datagram Protocol) - \u7528\u6237\u6570\u636e\u62a5\u534f\u8bae<\/strong><\/p>\n\n\n\n<p><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u60f3\u8c61\u4f60\u7ed9\u670b\u53cb\u5bc4\u4e00\u5f20\u660e\u4fe1\u7247\u3002\u4f60\u5199\u597d\u5c31\u5bc4\u51fa\u53bb\uff0c\u4e0d\u5173\u5fc3\u670b\u53cb\u662f\u5426\u6536\u5230\uff0c\u4e5f\u4e0d\u7ba1\u660e\u4fe1\u7247\u662f\u5426\u4f1a\u4e22\u5931\u6216\u987a\u5e8f\u98a0\u5012\u3002\u4f60\u53ea\u56fe\u4e00\u4e2a\u201c\u5feb\u201d\u3002<\/p>\n\n\n\n<p><strong>\u6838\u5fc3\u7279\u70b9\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e0\u8fde\u63a5 (Connectionless)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>UDP\u5728\u6570\u636e\u4f20\u8f93\u4e4b\u524d<strong>\u4e0d\u9700\u8981\u5efa\u7acb\u8fde\u63a5<\/strong>\u3002<\/li>\n\n\n\n<li>\u53d1\u9001\u65b9\u76f4\u63a5\u5c06\u6570\u636e\u62a5\u53d1\u9001\u51fa\u53bb\uff0c\u4e0d\u5173\u5fc3\u63a5\u6536\u65b9\u662f\u5426\u5728\u7ebf\u6216\u662f\u5426\u51c6\u5907\u597d\u63a5\u6536\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\uff1a<\/strong> \u7701\u53bb\u4e86\u5efa\u7acb\u548c\u65ad\u5f00\u8fde\u63a5\u7684\u5f00\u9500\uff0c\u4f20\u8f93\u901f\u5ea6\u66f4\u5feb\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u9760\u4f20\u8f93 (Unreliable)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>UDP<strong>\u4e0d\u4fdd\u8bc1<\/strong>\u6570\u636e\u80fd\u591f\u51c6\u786e\u65e0\u8bef\u3001\u4e0d\u4e22\u5931\u3001\u4e0d\u91cd\u590d\u3001\u6309\u987a\u5e8f\u5730\u5230\u8fbe\u76ee\u7684\u5730\u3002<\/li>\n\n\n\n<li><strong>\u6ca1\u6709\u5b9e\u73b0\u673a\u5236\uff1a<\/strong> \u6ca1\u6709\u5e8f\u5217\u53f7\u3001\u6ca1\u6709\u786e\u8ba4\u5e94\u7b54\u3001\u6ca1\u6709\u8d85\u65f6\u91cd\u4f20\u3001\u6ca1\u6709\u6d41\u91cf\u63a7\u5236\u3001\u6ca1\u6709\u62e5\u585e\u63a7\u5236\u3002<\/li>\n\n\n\n<li><strong>\u539f\u56e0\uff1a<\/strong> \u8fd9\u4e9b\u673a\u5236\u4f1a\u589e\u52a0\u5f00\u9500\uff0c\u964d\u4f4e\u4f20\u8f93\u901f\u5ea6\u3002UDP\u5c06\u8fd9\u4e9b\u53ef\u9760\u6027\u4fdd\u8bc1\u7684\u4efb\u52a1\u7559\u7ed9\u4e86\u5e94\u7528\u5c42\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u62a5\u6587\u6bb5\u5bfc\u5411 (Datagram-Oriented)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>UDP\u4fdd\u7559\u4e86\u5e94\u7528\u7a0b\u5e8f\u53d1\u9001\u7684\u62a5\u6587\u8fb9\u754c\u3002\u53d1\u9001\u65b9\u53d1\u9001\u4e00\u4e2aUDP\u6570\u636e\u62a5\uff0c\u63a5\u6536\u65b9\u5c31\u6536\u5230\u4e00\u4e2aUDP\u6570\u636e\u62a5\uff0c\u4e0d\u4f1a\u8fdb\u884c\u62c6\u5206\u6216\u5408\u5e76\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5934\u90e8\u5f00\u9500\u5c0f (Low Overhead)\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>UDP\u5934\u90e8\u53ea\u67098\u4e2a\u5b57\u8282\uff08\u6e90\u7aef\u53e3\u3001\u76ee\u7684\u7aef\u53e3\u3001\u957f\u5ea6\u3001\u6821\u9a8c\u548c\uff09\uff0c\u800cTCP\u5934\u90e8\u81f3\u5c11\u670920\u4e2a\u5b57\u8282\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p><strong>\u9002\u7528\u573a\u666f\uff1a<\/strong> \u5bf9\u5b9e\u65f6\u6027\u8981\u6c42\u9ad8\uff0c\u5141\u8bb8\u5c11\u91cf\u6570\u636e\u4e22\u5931\uff0c\u6216\u8005\u5e94\u7528\u5c42\u81ea\u5df1\u5b9e\u73b0\u53ef\u9760\u6027\u673a\u5236\u7684\u5e94\u7528\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9e\u65f6\u97f3\u89c6\u9891\u4f20\u8f93 (VoIP, Video Streaming)\uff1a<\/strong> \u4e22\u5931\u51e0\u4e2a\u6570\u636e\u5305\u53ef\u80fd\u53ea\u662f\u753b\u9762\u5361\u987f\u6216\u58f0\u97f3\u5931\u771f\uff0c\u4f46\u7b49\u5f85\u91cd\u4f20\u4f1a\u5bfc\u81f4\u4e25\u91cd\u5ef6\u8fdf\uff0c\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u3002<\/li>\n\n\n\n<li><strong>\u5728\u7ebf\u6e38\u620f\uff1a<\/strong> \u5b9e\u65f6\u6027\u81f3\u5173\u91cd\u8981\uff0c\u77ed\u6682\u7684\u5ef6\u8fdf\u6bd4\u4e22\u5931\u51e0\u4e2a\u753b\u9762\u66f4\u65b0\u66f4\u7cdf\u7cd5\u3002<\/li>\n\n\n\n<li><strong>\u57df\u540d\u7cfb\u7edf (DNS)\uff1a<\/strong> \u5feb\u901f\u67e5\u8be2\u548c\u54cd\u5e94\uff0c\u901a\u5e38\u662f\u5c0f\u6570\u636e\u5305\uff0c\u4e22\u5931\u53ef\u4ee5\u91cd\u8bd5\u3002<\/li>\n\n\n\n<li><strong>\u7f51\u7edc\u7ba1\u7406\u534f\u8bae (SNMP)\uff1a<\/strong> \u76d1\u63a7\u7f51\u7edc\u8bbe\u5907\uff0c\u5feb\u901f\u53d1\u9001\u72b6\u6001\u4fe1\u606f\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u4e3b\u8981\u533a\u522b\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5f81<\/th><th>TCP (\u4f20\u8f93\u63a7\u5236\u534f\u8bae)<\/th><th>UDP (\u7528\u6237\u6570\u636e\u62a5\u534f\u8bae)<\/th><\/tr><\/thead><tbody><tr><td><strong>\u8fde\u63a5\u6027<\/strong><\/td><td>\u9762\u5411\u8fde\u63a5 (\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\uff0c\u56db\u6b21\u6325\u624b\u65ad\u5f00)<\/td><td>\u65e0\u8fde\u63a5<\/td><\/tr><tr><td><strong>\u53ef\u9760\u6027<\/strong><\/td><td>\u53ef\u9760\u4f20\u8f93 (\u4fdd\u8bc1\u6570\u636e\u4e0d\u4e22\u5931\u3001\u4e0d\u91cd\u590d\u3001\u6309\u5e8f\u5230\u8fbe)<\/td><td>\u4e0d\u53ef\u9760\u4f20\u8f93 (\u4e0d\u4fdd\u8bc1\u6570\u636e\u5230\u8fbe)<\/td><\/tr><tr><td><strong>\u4f20\u8f93\u65b9\u5f0f<\/strong><\/td><td>\u5b57\u8282\u6d41 (\u5e94\u7528\u7a0b\u5e8f\u6570\u636e\u88ab\u89c6\u4e3a\u5b57\u8282\u6d41\uff0cTCP\u8fdb\u884c\u5206\u6bb5)<\/td><td>\u6570\u636e\u62a5 (\u4fdd\u7559\u5e94\u7528\u7a0b\u5e8f\u53d1\u9001\u7684\u62a5\u6587\u8fb9\u754c)<\/td><\/tr><tr><td><strong>\u4f20\u8f93\u901f\u5ea6<\/strong><\/td><td>\u76f8\u5bf9\u8f83\u6162 (\u56e0\u53ef\u9760\u6027\u673a\u5236\u548c\u8fde\u63a5\u7ba1\u7406\u5f00\u9500)<\/td><td>\u76f8\u5bf9\u8f83\u5feb (\u5f00\u9500\u5c0f\uff0c\u76f4\u63a5\u53d1\u9001)<\/td><\/tr><tr><td><strong>\u5934\u90e8\u5927\u5c0f<\/strong><\/td><td>20-60 \u5b57\u8282<\/td><td>8 \u5b57\u8282<\/td><\/tr><tr><td><strong>\u6d41\u91cf\u63a7\u5236<\/strong><\/td><td>\u6709 (\u6ed1\u52a8\u7a97\u53e3\u673a\u5236)<\/td><td>\u65e0<\/td><\/tr><tr><td><strong>\u62e5\u585e\u63a7\u5236<\/strong><\/td><td>\u6709 (\u6162\u542f\u52a8\u3001\u62e5\u585e\u907f\u514d\u7b49\u7b97\u6cd5)<\/td><td>\u65e0<\/td><\/tr><tr><td><strong>\u9002\u7528\u573a\u666f<\/strong><\/td><td>\u6587\u4ef6\u4f20\u8f93\u3001Web\u6d4f\u89c8\u3001\u90ae\u4ef6\u3001SSH\u7b49<\/td><td>\u5b9e\u65f6\u97f3\u89c6\u9891\u3001\u5728\u7ebf\u6e38\u620f\u3001DNS\u3001SNMP\u7b49<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TCP\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u662f\u4ec0\u4e48\uff1a<\/strong> \u9762\u5411\u8fde\u63a5\u3001\u53ef\u9760\u7684\u4f20\u8f93\u534f\u8bae\u3002<\/li>\n\n\n\n<li>\u7279\u70b9\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u4e09\u6b21\u63e1\u624b<\/strong>\u5efa\u7acb\u8fde\u63a5\uff0c<strong>\u56db\u6b21\u6325\u624b<\/strong>\u65ad\u5f00\u8fde\u63a5\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u6309\u5e8f\u5230\u8fbe<\/strong>\uff0c<strong>\u65e0\u5dee\u9519<\/strong>\uff0c<strong>\u65e0\u4e22\u5931<\/strong>\u3002<\/li>\n\n\n\n<li>\u6709\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236\u673a\u5236\u3002<\/li>\n\n\n\n<li>\u5f00\u9500\u8f83\u5927\uff0c\u4f20\u8f93\u6548\u7387\u76f8\u5bf9\u4f4e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7c7b\u6bd4\uff1a<\/strong> \u6253\u7535\u8bdd\uff0c\u9700\u8981\u5148\u63a5\u901a\uff0c\u901a\u8bdd\u8fc7\u7a0b\u7a33\u5b9a\u53ef\u9760\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> HTTP, HTTPS, FTP, SSH, SMTP, POP3, IMAP \u7b49\u3002<\/li>\n\n\n\n<li><strong>CTF \u610f\u4e49\uff1a<\/strong> SYN Flood \u653b\u51fb\u3001TCP \u4f1a\u8bdd\u52ab\u6301\u3001\u7aef\u53e3\u626b\u63cf\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>UDP\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u662f\u4ec0\u4e48\uff1a<\/strong> \u65e0\u8fde\u63a5\u3001\u4e0d\u53ef\u9760\u7684\u4f20\u8f93\u534f\u8bae\u3002<\/li>\n\n\n\n<li>\u7279\u70b9\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u65e0\u9700\u5efa\u7acb\u8fde\u63a5<\/strong>\uff0c\u76f4\u63a5\u53d1\u9001\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u4fdd\u8bc1\u6570\u636e\u5230\u8fbe<\/strong>\uff0c\u4e0d\u4fdd\u8bc1\u987a\u5e8f\uff0c\u53ef\u80fd\u4e22\u5931\u3001\u91cd\u590d\u6216\u4e71\u5e8f\u3002<\/li>\n\n\n\n<li>\u65e0\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236\u3002<\/li>\n\n\n\n<li>\u5f00\u9500\u5c0f\uff0c\u4f20\u8f93\u6548\u7387\u9ad8\uff0c\u5ef6\u8fdf\u4f4e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7c7b\u6bd4\uff1a<\/strong> \u5bc4\u660e\u4fe1\u7247\uff0c\u53d1\u51fa\u53bb\u5c31\u4e0d\u7ba1\u4e86\uff0c\u4e0d\u4fdd\u8bc1\u5bf9\u65b9\u4e00\u5b9a\u6536\u5230\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> DNS, NTP, SNMP, VoIP, \u5728\u7ebf\u6e38\u620f\u7b49\u3002<\/li>\n\n\n\n<li><strong>CTF \u610f\u4e49\uff1a<\/strong> UDP Flood \u653b\u51fb\u3001DNS \u653e\u5927\u653b\u51fb\u3001NTP \u653e\u5927\u653b\u51fb\u3001\u7aef\u53e3\u626b\u63cf\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e3b\u8981\u533a\u522b\uff1a<\/strong> TCP \u53ef\u9760\u3001\u9762\u5411\u8fde\u63a5\uff1bUDP \u4e0d\u53ef\u9760\u3001\u65e0\u8fde\u63a5\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u54ea\u4e2a\u66f4\u201c\u5b89\u5168\u201d\uff1f<\/strong><\/h3>\n\n\n\n<p>\u5f53\u6211\u4eec\u8c08\u8bbaTCP\u548cUDP\u54ea\u4e2a\u66f4\u201c\u5b89\u5168\u201d\u65f6\uff0c\u9700\u8981\u6f84\u6e05\u201c\u5b89\u5168\u201d\u7684\u542b\u4e49\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6570\u636e\u5b8c\u6574\u6027\u4e0e\u53ef\u9760\u6027\u65b9\u9762\u7684\u201c\u5b89\u5168\u201d\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>TCP \u66f4\u201c\u5b89\u5168\u201d<\/strong>\u3002TCP\u901a\u8fc7\u5176\u53ef\u9760\u6027\u673a\u5236\uff08\u5e8f\u5217\u53f7\u3001\u786e\u8ba4\u5e94\u7b54\u3001\u91cd\u4f20\u3001\u6821\u9a8c\u548c\u7b49\uff09\u786e\u4fdd\u6570\u636e\u5728\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u4e0d\u4f1a\u4e22\u5931\u3001\u635f\u574f\u6216\u4e71\u5e8f\u3002\u5b83\u4fdd\u8bc1\u4e86<strong>\u6570\u636e\u4f20\u8f93\u7684\u5b8c\u6574\u6027\u548c\u51c6\u786e\u6027<\/strong>\u3002\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u770b\uff0cTCP\u63d0\u4f9b\u4e86\u66f4\u9ad8\u7684\u201c\u5b89\u5168\u6027\u201d\uff0c\u56e0\u4e3a\u5b83\u786e\u4fdd\u4e86\u4f60\u53d1\u9001\u7684\u6570\u636e\u5c31\u662f\u63a5\u6536\u65b9\u6536\u5230\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u52a0\u5bc6\u4e0e\u9690\u79c1\u65b9\u9762\u7684\u201c\u5b89\u5168\u201d\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>TCP \u548c UDP \u672c\u8eab\u90fd\u4e0d\u63d0\u4f9b\u52a0\u5bc6\u6216\u9690\u79c1\u4fdd\u62a4\u3002<\/strong> \u5b83\u4eec\u53ea\u662f\u4f20\u8f93\u534f\u8bae\uff0c\u4e0d\u8d1f\u8d23\u6570\u636e\u7684\u52a0\u5bc6\u3002<\/li>\n\n\n\n<li>\u771f\u6b63\u7684\u52a0\u5bc6\u5b89\u5168\u6027\u662f\u7531\u66f4\u9ad8\u5c42\u7684\u534f\u8bae\u63d0\u4f9b\u7684\uff0c\u4f8b\u5982\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>TLS\/SSL\uff1a<\/strong> \u901a\u5e38\u8fd0\u884c\u5728TCP\u4e4b\u4e0a\uff08\u5982HTTPS\uff09\uff0c\u63d0\u4f9b\u6570\u636e\u52a0\u5bc6\u3001\u8eab\u4efd\u9a8c\u8bc1\u548c\u5b8c\u6574\u6027\u4fdd\u62a4\u3002<\/li>\n\n\n\n<li><strong>IPsec\uff1a<\/strong> \u8fd0\u884c\u5728\u7f51\u7edc\u5c42\uff0c\u53ef\u4ee5\u4e3aTCP\u548cUDP\u6d41\u91cf\u63d0\u4f9b\u52a0\u5bc6\u548c\u8eab\u4efd\u9a8c\u8bc1\u3002<\/li>\n\n\n\n<li><strong>VPN\uff1a<\/strong> \u53ef\u4ee5\u5728IP\u5c42\u6216\u66f4\u9ad8\u5c42\u521b\u5efa\u52a0\u5bc6\u96a7\u9053\uff0c\u4fdd\u62a4TCP\u548cUDP\u6d41\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">OSI\u4e03\u5c42\u6a21\u578b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u603b\u6982<\/h3>\n\n\n\n<p><strong>\u80cc\u666f\uff1a<\/strong> OSI\u6a21\u578b\u662f\u7531\u56fd\u9645\u6807\u51c6\u5316\u7ec4\u7ec7 (ISO) \u57281980\u5e74\u4ee3\u63d0\u51fa\u7684\u4e00\u4e2a\u6982\u5ff5\u6027\u6846\u67b6\uff0c\u65e8\u5728\u5b9a\u4e49\u7f51\u7edc\u901a\u4fe1\u7684\u5404\u4e2a\u9636\u6bb5\uff0c\u4f7f\u4e0d\u540c\u5382\u5546\u7684\u786c\u4ef6\u548c\u8f6f\u4ef6\u80fd\u591f\u76f8\u4e92\u517c\u5bb9\u3002\u5b83\u5c06\u590d\u6742\u7684\u7f51\u7edc\u901a\u4fe1\u8fc7\u7a0b\u5212\u5206\u4e3a\u4e03\u4e2a\u903b\u8f91\u4e0a\u72ec\u7acb\u7684\u5c42\u6b21\u3002<\/p>\n\n\n\n<p><strong>\u6838\u5fc3\u601d\u60f3\uff1a<\/strong> \u6bcf\u4e00\u5c42\u90fd\u4e3a\u4e0a\u4e00\u5c42\u63d0\u4f9b\u670d\u52a1\uff0c\u5e76\u4f7f\u7528\u4e0b\u4e00\u5c42\u63d0\u4f9b\u7684\u670d\u52a1\u3002\u5c42\u4e0e\u5c42\u4e4b\u95f4\u901a\u8fc7\u63a5\u53e3\u8fdb\u884c\u901a\u4fe1\uff0c\u6bcf\u5c42\u53ea\u5173\u5fc3\u81ea\u5df1\u7684\u529f\u80fd\uff0c\u4e0d\u5173\u5fc3\u5176\u4ed6\u5c42\u7684\u5177\u4f53\u5b9e\u73b0\u3002\u8fd9\u79cd\u5206\u5c42\u8bbe\u8ba1\u4f7f\u5f97\u7f51\u7edc\u534f\u8bae\u7684\u5f00\u53d1\u548c\u7ef4\u62a4\u66f4\u52a0\u6a21\u5757\u5316\u548c\u9ad8\u6548\u3002<\/p>\n\n\n\n<p><strong>\u6570\u636e\u5c01\u88c5\u4e0e\u89e3\u5c01\u88c5\uff1a<\/strong> \u6570\u636e\u4ece\u5e94\u7528\u5c42\u5411\u4e0b\u4f20\u9012\u65f6\uff0c\u6bcf\u4e00\u5c42\u90fd\u4f1a\u7ed9\u6570\u636e\u6dfb\u52a0\u81ea\u5df1\u7684<strong>\u5934\u90e8 (Header)<\/strong> \u4fe1\u606f\uff08\u6709\u65f6\u8fd8\u6709\u5c3e\u90e8\uff09\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a<strong>\u5c01\u88c5 (Encapsulation)<\/strong>\u3002\u6570\u636e\u5230\u8fbe\u76ee\u7684\u4e3b\u673a\u540e\uff0c\u4ece\u7269\u7406\u5c42\u5411\u4e0a\u9012\u4ea4\u65f6\uff0c\u6bcf\u4e00\u5c42\u90fd\u4f1a\u5265\u79bb\u6389\u5bf9\u5e94\u7684\u5934\u90e8\u4fe1\u606f\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a<strong>\u89e3\u5c01\u88c5 (Decapsulation)<\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>OSI \u4e03\u5c42\u6a21\u578b\u8be6\u89e3\u53ca\u7aef\u53e3\u5173\u8054<\/strong><\/h3>\n\n\n\n<p><strong>\u91cd\u8981\u63d0\u793a\uff1a<\/strong> <strong>\u7aef\u53e3 (Port)<\/strong> \u662f\u4e00\u4e2a<strong>\u4f20\u8f93\u5c42 (Transport Layer, \u7b2c\u56db\u5c42)<\/strong> \u7684\u6982\u5ff5\uff0c\u7528\u4e8e\u6807\u8bc6\u4e00\u53f0\u4e3b\u673a\u4e0a\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5e8f\u6216\u670d\u52a1\u8fdb\u7a0b\u3002\u56e0\u6b64\uff0c\u4e25\u683c\u6765\u8bf4\uff0c\u53ea\u6709\u4f20\u8f93\u5c42\u548c\u5e94\u7528\u5c42\uff08\u901a\u8fc7\u4f20\u8f93\u5c42\uff09\u624d\u4e0e\u7aef\u53e3\u76f4\u63a5\u76f8\u5173\u3002\u5176\u4ed6\u5c42\u6ca1\u6709\u201c\u7aef\u53e3\u201d\u7684\u6982\u5ff5\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u4e00\u5c42\uff1a\u7269\u7406\u5c42 (Physical Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u8d1f\u8d23\u6570\u636e\u5728\u7269\u7406\u4f20\u8f93\u4ecb\u8d28\u4e0a\u7684\u539f\u59cb\u6bd4\u7279\u6d41\u4f20\u8f93\u3002\u5b83\u5b9a\u4e49\u4e86\u7269\u7406\u63a5\u53e3\u7684\u7535\u6c14\u3001\u673a\u68b0\u3001\u8fc7\u7a0b\u548c\u529f\u80fd\u7279\u6027\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> <strong>\u6bd4\u7279 (Bit)<\/strong>\u3002<\/li>\n\n\n\n<li>\u5173\u952e\u6982\u5ff5\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u4ecb\u8d28\uff1a<\/strong> \u7f51\u7ebf\uff08\u53cc\u7ede\u7ebf\u3001\u5149\u7ea4\uff09\u3001\u65e0\u7ebf\u7535\u6ce2\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u4fe1\u53f7\uff1a<\/strong> \u7535\u538b\u3001\u5149\u8109\u51b2\u3001\u65e0\u7ebf\u9891\u7387\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u62d3\u6251\uff1a<\/strong> \u661f\u578b\u3001\u603b\u7ebf\u578b\u3001\u73af\u578b\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u7f16\u7801\uff1a<\/strong> \u5982\u4f55\u5c06\u6bd4\u7279\u8f6c\u6362\u4e3a\u7269\u7406\u4fe1\u53f7\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u8bbe\u5907\uff1a<\/strong> \u7f51\u7ebf\u3001\u7f51\u5361\u3001\u96c6\u7ebf\u5668 (Hub)\u3001\u4e2d\u7ee7\u5668 (Repeater)\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u4fee\u5efa\u9053\u8def\u548c\u94fa\u8bbe\u7535\u7ebf\uff0c\u786e\u4fdd\u4fe1\u606f\u80fd\u4ee5\u7269\u7406\u5f62\u5f0f\u4f20\u8f93\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong> <strong>\u65e0\u3002<\/strong> \u7269\u7406\u5c42\u53ea\u5173\u5fc3\u6bd4\u7279\u6d41\u7684\u4f20\u8f93\uff0c\u4e0d\u6d89\u53ca\u4efb\u4f55\u903b\u8f91\u4e0a\u7684\u5e94\u7528\u7a0b\u5e8f\u6807\u8bc6\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u4e8c\u5c42\uff1a\u6570\u636e\u94fe\u8def\u5c42 (Data Link Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u5728\u7269\u7406\u5c42\u63d0\u4f9b\u7684\u4e0d\u53ef\u9760\u6bd4\u7279\u6d41\u4f20\u8f93\u57fa\u7840\u4e0a\uff0c\u5efa\u7acb\u3001\u7ef4\u62a4\u548c\u91ca\u653e\u6570\u636e\u94fe\u8def\uff0c\u8fdb\u884c<strong>\u5e27 (Frame)<\/strong> \u7684\u4f20\u8f93\uff0c\u5e76\u63d0\u4f9b<strong>\u9519\u8bef\u68c0\u6d4b\u548c\u7ea0\u6b63<\/strong>\uff08\u5728\u67d0\u4e9b\u5b50\u5c42\uff09\u3002\u5b83\u8d1f\u8d23\u5728<strong>\u5c40\u57df\u7f51 (LAN)<\/strong> \u5185\u7684\u76f8\u90bb\u8282\u70b9\u4e4b\u95f4\u53ef\u9760\u5730\u4f20\u8f93\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> <strong>\u5e27 (Frame)<\/strong>\u3002<\/li>\n\n\n\n<li>\u5173\u952e\u6982\u5ff5\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>MAC \u5730\u5740 (Media Access Control Address)\uff1a<\/strong> \u7269\u7406\u5730\u5740\uff0c\u5168\u7403\u552f\u4e00\uff0c\u7528\u4e8e\u5728\u5c40\u57df\u7f51\u5185\u6807\u8bc6\u7f51\u7edc\u8bbe\u5907\u3002<\/li>\n\n\n\n<li><strong>ARP (Address Resolution Protocol)\uff1a<\/strong> \u5730\u5740\u89e3\u6790\u534f\u8bae\uff0c\u5c06IP\u5730\u5740\u89e3\u6790\u4e3aMAC\u5730\u5740\u3002<\/li>\n\n\n\n<li><strong>\u4ea4\u6362\u673a (Switch)\uff1a<\/strong> \u6839\u636eMAC\u5730\u5740\u8f6c\u53d1\u5e27\u3002<\/li>\n\n\n\n<li><strong>LLC (Logical Link Control) \u5b50\u5c42\uff1a<\/strong> \u63d0\u4f9b\u6570\u636e\u94fe\u8def\u670d\u52a1\u8bbf\u95ee\u70b9 (DSAP\/SSAP)\uff0c\u4e0e\u7f51\u7edc\u5c42\u63a5\u53e3\u3002<\/li>\n\n\n\n<li><strong>MAC (Media Access Control) \u5b50\u5c42\uff1a<\/strong> \u8d1f\u8d23\u4ecb\u8d28\u8bbf\u95ee\u63a7\u5236\u3001\u5e27\u7684\u5c01\u88c5\u548c\u89e3\u5c01\u88c5\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong> \u4ee5\u592a\u7f51 (Ethernet)\u3001Wi-Fi (802.11)\u3001PPP (Point-to-Point Protocol)\u3002<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u8bbe\u5907\uff1a<\/strong> \u7f51\u5361\u3001\u4ea4\u6362\u673a (Switch)\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u5728\u4e00\u6761\u7279\u5b9a\u7684\u9053\u8def\u4e0a\uff0c\u8f66\u8f86\uff08\u5e27\uff09\u5982\u4f55\u884c\u9a76\uff0c\u5982\u4f55\u907f\u514d\u78b0\u649e\uff0c\u4ee5\u53ca\u6bcf\u8f86\u8f66\u90fd\u6709\u4e00\u4e2a\u72ec\u7279\u7684\u8f66\u724c\u53f7\uff08MAC\u5730\u5740\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong> <strong>\u65e0\u3002<\/strong> \u6570\u636e\u94fe\u8def\u5c42\u4f7f\u7528MAC\u5730\u5740\u8fdb\u884c\u5c40\u57df\u7f51\u5185\u7684\u5bfb\u5740\uff0c\u4e0d\u6d89\u53ca\u7aef\u53e3\u53f7\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u4e09\u5c42\uff1a\u7f51\u7edc\u5c42 (Network Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u8d1f\u8d23\u5728<strong>\u4e0d\u540c\u7f51\u7edc\u4e4b\u95f4<\/strong>\u8fdb\u884c\u6570\u636e\u5305\u7684\u8def\u7531\u548c\u8f6c\u53d1\uff0c\u5b9e\u73b0<strong>\u7aef\u5230\u7aef (End-to-End)<\/strong> \u7684\u903b\u8f91\u5bfb\u5740\u3002\u5b83\u5b9a\u4e49\u4e86\u6570\u636e\u5305\u5982\u4f55\u4ece\u6e90\u4e3b\u673a\u4f20\u8f93\u5230\u76ee\u7684\u4e3b\u673a\uff0c\u5373\u4f7f\u5b83\u4eec\u4e0d\u5728\u540c\u4e00\u4e2a\u5c40\u57df\u7f51\u4e2d\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> <strong>\u6570\u636e\u5305 (Packet)<\/strong>\u3002<\/li>\n\n\n\n<li>\u5173\u952e\u6982\u5ff5\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>IP \u5730\u5740 (Internet Protocol Address)\uff1a<\/strong> \u903b\u8f91\u5730\u5740\uff0c\u7528\u4e8e\u5728\u4e92\u8054\u7f51\u4e0a\u552f\u4e00\u6807\u8bc6\u4e00\u53f0\u4e3b\u673a\u3002<\/li>\n\n\n\n<li><strong>\u8def\u7531 (Routing)\uff1a<\/strong> \u51b3\u5b9a\u6570\u636e\u5305\u4ece\u6e90\u5230\u76ee\u7684\u7684\u6700\u4f73\u8def\u5f84\u3002<\/li>\n\n\n\n<li><strong>\u8def\u7531\u5668 (Router)\uff1a<\/strong> \u8fde\u63a5\u4e0d\u540c\u7f51\u7edc\uff0c\u6839\u636eIP\u5730\u5740\u8f6c\u53d1\u6570\u636e\u5305\u3002<\/li>\n\n\n\n<li><strong>ICMP (Internet Control Message Protocol)\uff1a<\/strong> \u4e92\u8054\u7f51\u63a7\u5236\u62a5\u6587\u534f\u8bae\uff0c\u7528\u4e8e\u53d1\u9001\u9519\u8bef\u62a5\u544a\u548c\u7f51\u7edc\u8bca\u65ad\u4fe1\u606f\uff08\u5982Ping\uff09\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong> IP (IPv4, IPv6)\u3001ICMP\u3001IGMP (Internet Group Management Protocol)\u3002<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u8bbe\u5907\uff1a<\/strong> \u8def\u7531\u5668 (Router)\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u5168\u7403\u90ae\u653f\u7cfb\u7edf\uff0c\u8d1f\u8d23\u5c06\u4fe1\u4ef6\uff08\u6570\u636e\u5305\uff09\u4ece\u4e00\u4e2a\u57ce\u5e02\u7684\u5730\u5740\uff08\u6e90IP\uff09\u53d1\u9001\u5230\u53e6\u4e00\u4e2a\u57ce\u5e02\u7684\u5730\u5740\uff08\u76ee\u7684IP\uff09\uff0c\u4e2d\u95f4\u53ef\u80fd\u7ecf\u8fc7\u5f88\u591a\u4e2d\u8f6c\u7ad9\uff08\u8def\u7531\u5668\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong> <strong>\u65e0\u3002<\/strong> \u7f51\u7edc\u5c42\u4f7f\u7528IP\u5730\u5740\u8fdb\u884c\u4e3b\u673a\u95f4\u7684\u5bfb\u5740\uff0c\u4e0d\u6d89\u53ca\u7aef\u53e3\u53f7\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u56db\u5c42\uff1a\u4f20\u8f93\u5c42 (Transport Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u63d0\u4f9b<strong>\u7aef\u5230\u7aef (End-to-End)<\/strong> \u7684<strong>\u8fdb\u7a0b\u95f4\u901a\u4fe1<\/strong>\u3002\u5b83\u8d1f\u8d23\u5c06\u6570\u636e\u4ece\u6e90\u4e3b\u673a\u4e0a\u7684<strong>\u67d0\u4e2a\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b<\/strong>\u4f20\u8f93\u5230\u76ee\u7684\u4e3b\u673a\u4e0a\u7684<strong>\u67d0\u4e2a\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b<\/strong>\u3002\u5b83\u63d0\u4f9b\u4e24\u79cd\u4e3b\u8981\u670d\u52a1\uff1a\u53ef\u9760\u7684\u9762\u5411\u8fde\u63a5\u670d\u52a1 (TCP) \u548c\u4e0d\u53ef\u9760\u7684\u65e0\u8fde\u63a5\u670d\u52a1 (UDP)\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> <strong>TCP \u6bb5 (Segment)<\/strong> \u6216 <strong>UDP \u6570\u636e\u62a5 (Datagram)<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u5173\u952e\u6982\u5ff5\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7aef\u53e3\u53f7 (Port Number)\uff1a<\/strong> 16\u4f4d\u6570\u5b57\uff0c\u7528\u4e8e\u6807\u8bc6\u4e00\u53f0\u4e3b\u673a\u4e0a\u4e0d\u540c\u7684\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b\u3002\u8fd9\u662f\u672c\u5c42\u6700\u91cd\u8981\u7684\u6982\u5ff5\u3002<\/li>\n\n\n\n<li><strong>TCP (Transmission Control Protocol)\uff1a<\/strong> \u63d0\u4f9b\u53ef\u9760\u7684\u3001\u9762\u5411\u8fde\u63a5\u7684\u3001\u5168\u53cc\u5de5\u7684\u4f20\u8f93\u670d\u52a1\uff0c\u5177\u6709\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236\u3001\u91cd\u4f20\u673a\u5236\u7b49\u3002<\/li>\n\n\n\n<li><strong>UDP (User Datagram Protocol)\uff1a<\/strong> \u63d0\u4f9b\u4e0d\u53ef\u9760\u7684\u3001\u65e0\u8fde\u63a5\u7684\u3001\u5c3d\u529b\u800c\u4e3a\u7684\u4f20\u8f93\u670d\u52a1\uff0c\u5f00\u9500\u5c0f\uff0c\u901f\u5ea6\u5feb\u3002<\/li>\n\n\n\n<li><strong>\u5e8f\u5217\u53f7 (Sequence Number)\uff1a<\/strong> TCP\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u6309\u5e8f\u5230\u8fbe\u3002<\/li>\n\n\n\n<li><strong>\u786e\u8ba4\u5e94\u7b54 (Acknowledgment - ACK)\uff1a<\/strong> TCP\u7528\u4e8e\u786e\u8ba4\u6570\u636e\u6536\u5230\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong> TCP\u3001UDP\u3002<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u8bbe\u5907\uff1a<\/strong> \u65e0\u72ec\u7acb\u8bbe\u5907\uff0c\u529f\u80fd\u7531\u64cd\u4f5c\u7cfb\u7edf\u5b9e\u73b0\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u5728\u6536\u5230\u4e86\u4fe1\u4ef6\u7684\u5927\u697c\u91cc\uff0c\u5c06\u4fe1\u4ef6\u51c6\u786e\u5730\u6295\u9012\u5230\u6536\u4ef6\u4eba\u6240\u5728\u7684<strong>\u5177\u4f53\u623f\u95f4\u53f7<\/strong>\uff08\u7aef\u53e3\u53f7\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong><strong>\u6709\uff01\u8fd9\u662f\u7aef\u53e3\u6982\u5ff5\u7684\u8bde\u751f\u5730\u3002<\/strong> \u7aef\u53e3\u53f7\u662f\u4f20\u8f93\u5c42\u7528\u6765\u533a\u5206\u4e0d\u540c\u5e94\u7528\u7a0b\u5e8f\u8fdb\u7a0b\u7684\u6807\u8bc6\u7b26\u3002\n<ul class=\"wp-block-list\">\n<li><strong>\u7aef\u53e3\u8303\u56f4\uff1a<\/strong> 0 - 65535<\/li>\n\n\n\n<li><strong>\u5468\u77e5\u7aef\u53e3 (Well-known Ports)\uff1a0 - 1023<\/strong>\uff0c\u7531IANA\uff08\u4e92\u8054\u7f51\u53f7\u7801\u5206\u914d\u673a\u6784\uff09\u5206\u914d\u7ed9\u5e38\u7528\u7684\u7f51\u7edc\u670d\u52a1\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u518c\u7aef\u53e3 (Registered Ports)\uff1a1024 - 49151<\/strong>\uff0c\u53ef\u7531\u7528\u6237\u8fdb\u7a0b\u6216\u5e94\u7528\u7a0b\u5e8f\u6ce8\u518c\u4f7f\u7528\u3002<\/li>\n\n\n\n<li><strong>\u52a8\u6001\/\u79c1\u6709\u7aef\u53e3 (Dynamic\/Private Ports)\uff1a49152 - 65535<\/strong>\uff0c\u901a\u5e38\u7531\u5ba2\u6237\u7aef\u7a0b\u5e8f\u4e34\u65f6\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u4e94\u5c42\uff1a\u4f1a\u8bdd\u5c42 (Session Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u8d1f\u8d23\u5efa\u7acb\u3001\u7ba1\u7406\u548c\u7ec8\u6b62\u5e94\u7528\u7a0b\u5e8f\u4e4b\u95f4\u7684\u4f1a\u8bdd\uff08\u5bf9\u8bdd\uff09\u3002\u5b83\u63d0\u4f9b\u540c\u6b65\u670d\u52a1\uff0c\u5305\u62ec\u5728\u6570\u636e\u6d41\u4e2d\u8bbe\u7f6e\u68c0\u67e5\u70b9\uff0c\u4ee5\u4fbf\u5728\u7f51\u7edc\u6545\u969c\u65f6\u4ece\u4e0a\u6b21\u68c0\u67e5\u70b9\u6062\u590d\u4f1a\u8bdd\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> \u6570\u636e (Data)\u3002<\/li>\n\n\n\n<li>\u5173\u952e\u6982\u5ff5\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u5bf9\u8bdd\u63a7\u5236\uff1a<\/strong> \u51b3\u5b9a\u7531\u54ea\u4e00\u65b9\u53d1\u9001\u6570\u636e\uff0c\u54ea\u4e00\u65b9\u63a5\u6536\u6570\u636e\uff08\u5168\u53cc\u5de5\u3001\u534a\u53cc\u5de5\u3001\u5355\u5de5\uff09\u3002<\/li>\n\n\n\n<li><strong>\u540c\u6b65\uff1a<\/strong> \u5728\u6570\u636e\u6d41\u4e2d\u63d2\u5165\u540c\u6b65\u70b9\uff0c\u65b9\u4fbf\u6062\u590d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong> NetBIOS\u3001RPC (Remote Procedure Call)\u3001PPTP (Point-to-Point Tunneling Protocol\uff0c\u6709\u65f6\u4e5f\u5f52\u4e3a\u6b64\u5c42)\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u4f60\u548c\u670b\u53cb\u6253\u7535\u8bdd\uff0c\u4f1a\u8bdd\u5c42\u8d1f\u8d23\u7ba1\u7406\u4f60\u4eec\u7684\u5bf9\u8bdd\uff08\u8c01\u5148\u8bf4\uff0c\u8c01\u540e\u8bf4\uff0c\u4ec0\u4e48\u65f6\u5019\u6302\u65ad\uff09\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong> <strong>\u65e0\u3002<\/strong> \u4f1a\u8bdd\u5c42\u672c\u8eab\u4e0d\u4f7f\u7528\u7aef\u53e3\u53f7\uff0c\u5b83\u4f9d\u8d56\u4e8e\u4f20\u8f93\u5c42\u63d0\u4f9b\u7684\u7aef\u53e3\u670d\u52a1\u6765\u5efa\u7acb\u548c\u7ba1\u7406\u4f1a\u8bdd\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u516d\u5c42\uff1a\u8868\u793a\u5c42 (Presentation Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u8d1f\u8d23\u6570\u636e\u683c\u5f0f\u7684\u8f6c\u6362\u3001\u7f16\u7801\u3001\u89e3\u7801\u3001\u52a0\u5bc6\u548c\u89e3\u5bc6\uff0c\u4ee5\u53ca\u6570\u636e\u538b\u7f29\u548c\u89e3\u538b\u7f29\u3002\u5b83\u786e\u4fdd\u4ece\u5e94\u7528\u5c42\u63a5\u6536\u5230\u7684\u6570\u636e\u80fd\u591f\u88ab\u76ee\u7684\u4e3b\u673a\u7684\u5e94\u7528\u5c42\u7406\u89e3\u548c\u5904\u7406\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> \u6570\u636e (Data)\u3002<\/li>\n\n\n\n<li>\u5173\u952e\u6982\u5ff5\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u6570\u636e\u683c\u5f0f\u5316\uff1a<\/strong> \u5c06\u5e94\u7528\u7a0b\u5e8f\u6570\u636e\u8f6c\u6362\u4e3a\u7f51\u7edc\u6807\u51c6\u683c\u5f0f\uff0c\u6216\u5c06\u7f51\u7edc\u6807\u51c6\u683c\u5f0f\u8f6c\u6362\u56de\u5e94\u7528\u7a0b\u5e8f\u683c\u5f0f\uff08\u5982ASCII\u3001EBCDIC\uff09\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u52a0\u5bc6\/\u89e3\u5bc6\uff1a<\/strong> \u63d0\u4f9b\u6570\u636e\u5b89\u5168\u670d\u52a1\u3002<\/li>\n\n\n\n<li><strong>\u6570\u636e\u538b\u7f29\/\u89e3\u538b\u7f29\uff1a<\/strong> \u63d0\u9ad8\u4f20\u8f93\u6548\u7387\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong> JPEG\u3001MPEG\u3001ASCII\u3001EBCDIC\u3002SSL\/TLS\uff08\u5b89\u5168\u5957\u63a5\u5c42\/\u4f20\u8f93\u5c42\u5b89\u5168\uff09\u901a\u5e38\u88ab\u8ba4\u4e3a\u5de5\u4f5c\u5728\u8868\u793a\u5c42\u548c\u4f1a\u8bdd\u5c42\u4e4b\u95f4\uff0c\u751a\u81f3\u8de8\u8d8a\u66f4\u591a\u5c42\u3002<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u4e00\u4e2a\u7ffb\u8bd1\u5b98\u6216\u6570\u636e\u683c\u5f0f\u8f6c\u6362\u5668\uff0c\u786e\u4fdd\u4f60\u53d1\u51fa\u7684\u4e2d\u6587\u4fe1\u606f\u80fd\u88ab\u5916\u56fd\u4eba\u7406\u89e3\uff0c\u6216\u8005\u5bf9\u4fe1\u606f\u8fdb\u884c\u52a0\u5bc6\u548c\u538b\u7f29\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong> <strong>\u65e0\u3002<\/strong> \u8868\u793a\u5c42\u5904\u7406\u7684\u662f\u6570\u636e\u7684\u8868\u73b0\u5f62\u5f0f\uff0c\u4e0d\u6d89\u53ca\u7aef\u53e3\u53f7\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\u7b2c\u4e03\u5c42\uff1a\u5e94\u7528\u5c42 (Application Layer)<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u63d0\u4f9b\u7528\u6237\u4e0e\u7f51\u7edc\u4e4b\u95f4\u7684\u63a5\u53e3\uff0c\u76f4\u63a5\u4e3a\u6700\u7ec8\u7528\u6237\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u7f51\u7edc\u670d\u52a1\u3002\u5b83\u5305\u542b\u4e86\u5404\u79cd\u5e94\u7528\u7a0b\u5e8f\u6240\u9700\u7684\u534f\u8bae\uff0c\u7528\u4e8e\u6587\u4ef6\u4f20\u8f93\u3001\u7535\u5b50\u90ae\u4ef6\u3001\u7f51\u9875\u6d4f\u89c8\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u4f20\u8f93\u5355\u4f4d\uff1a<\/strong> \u6570\u636e (Data)\u3002<\/li>\n\n\n\n<li><strong>\u5173\u952e\u6982\u5ff5\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7528\u6237\u754c\u9762\uff1a<\/strong> \u5e94\u7528\u7a0b\u5e8f\u4e0e\u7528\u6237\u4ea4\u4e92\u7684\u754c\u9762\u3002<\/li>\n\n\n\n<li><strong>\u7279\u5b9a\u670d\u52a1\uff1a<\/strong> \u5404\u79cd\u5177\u4f53\u7684\u7f51\u7edc\u670d\u52a1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5e38\u89c1\u534f\u8bae\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>HTTP (Hypertext Transfer Protocol)\uff1a<\/strong> \u7f51\u9875\u6d4f\u89c8\u3002<\/li>\n\n\n\n<li><strong>HTTPS (Hypertext Transfer Protocol Secure)\uff1a<\/strong> \u5b89\u5168\u7f51\u9875\u6d4f\u89c8\u3002<\/li>\n\n\n\n<li><strong>FTP (File Transfer Protocol)\uff1a<\/strong> \u6587\u4ef6\u4f20\u8f93\u3002<\/li>\n\n\n\n<li><strong>SMTP (Simple Mail Transfer Protocol)\uff1a<\/strong> \u7535\u5b50\u90ae\u4ef6\u53d1\u9001\u3002<\/li>\n\n\n\n<li><strong>POP3 (Post Office Protocol version 3)\uff1a<\/strong> \u7535\u5b50\u90ae\u4ef6\u63a5\u6536\u3002<\/li>\n\n\n\n<li><strong>IMAP (Internet Message Access Protocol)\uff1a<\/strong> \u7535\u5b50\u90ae\u4ef6\u63a5\u6536\u548c\u7ba1\u7406\u3002<\/li>\n\n\n\n<li><strong>DNS (Domain Name System)\uff1a<\/strong> \u57df\u540d\u89e3\u6790\u3002<\/li>\n\n\n\n<li><strong>DHCP (Dynamic Host Configuration Protocol)\uff1a<\/strong> \u52a8\u6001\u4e3b\u673a\u914d\u7f6e\u3002<\/li>\n\n\n\n<li><strong>Telnet\uff1a<\/strong> \u8fdc\u7a0b\u7ec8\u7aef\u8bbf\u95ee\uff08\u4e0d\u5b89\u5168\uff09\u3002<\/li>\n\n\n\n<li><strong>SSH (Secure Shell)\uff1a<\/strong> \u5b89\u5168\u8fdc\u7a0b\u7ec8\u7aef\u8bbf\u95ee\u3002<\/li>\n\n\n\n<li><strong>SNMP (Simple Network Management Protocol)\uff1a<\/strong> \u7f51\u7edc\u8bbe\u5907\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u901a\u4fd7\u6bd4\u55bb\uff1a<\/strong> \u5c31\u50cf\u4f60\u4f7f\u7528\u7684\u5404\u79cd\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\uff08\u6d4f\u89c8\u5668\u3001\u90ae\u4ef6\u5ba2\u6237\u7aef\u3001\u6587\u4ef6\u7ba1\u7406\u5668\uff09\uff0c\u5b83\u4eec\u901a\u8fc7\u7f51\u7edc\u6765\u5b9e\u73b0\u7279\u5b9a\u529f\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u7aef\u53e3\u7684\u5173\u8054\uff1a<\/strong><strong>\u6709\uff01\u5e94\u7528\u5c42\u534f\u8bae\u4f1a\u4f7f\u7528\u4f20\u8f93\u5c42\u7684\u7aef\u53e3\u53f7\u3002<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5e38\u89c1\u5e94\u7528\u5c42\u534f\u8bae\u53ca\u5176\u9ed8\u8ba4\u7aef\u53e3\u53f7 (TCP\/UDP)\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>HTTP\uff1a<\/strong> TCP 80<\/li>\n\n\n\n<li><strong>HTTPS\uff1a<\/strong> TCP 443<\/li>\n\n\n\n<li><strong>FTP\uff1a<\/strong> TCP 20 (\u6570\u636e), TCP 21 (\u63a7\u5236)<\/li>\n\n\n\n<li><strong>SSH\uff1a<\/strong> TCP 22<\/li>\n\n\n\n<li><strong>Telnet\uff1a<\/strong> TCP 23<\/li>\n\n\n\n<li><strong>SMTP\uff1a<\/strong> TCP 25<\/li>\n\n\n\n<li><strong>DNS\uff1a<\/strong> UDP 53 (\u67e5\u8be2), TCP 53 (\u533a\u57df\u4f20\u8f93)<\/li>\n\n\n\n<li><strong>DHCP\uff1a<\/strong> UDP 67 (\u670d\u52a1\u5668), UDP 68 (\u5ba2\u6237\u7aef)<\/li>\n\n\n\n<li><strong>TFTP (Trivial File Transfer Protocol)\uff1a<\/strong> UDP 69<\/li>\n\n\n\n<li><strong>POP3\uff1a<\/strong> TCP 110<\/li>\n\n\n\n<li><strong>IMAP\uff1a<\/strong> TCP 143<\/li>\n\n\n\n<li><strong>SNMP\uff1a<\/strong> UDP 161 (\u4ee3\u7406), UDP 162 (\u7ba1\u7406\u5668)<\/li>\n\n\n\n<li><strong>LDAP (Lightweight Directory Access Protocol)\uff1a<\/strong> TCP 389<\/li>\n\n\n\n<li><strong>RDP (Remote Desktop Protocol)\uff1a<\/strong> TCP 3389<\/li>\n\n\n\n<li><strong>MySQL\uff1a<\/strong> TCP 3306<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>\u9762\u8bd5\u603b\u7ed3\u8981\u70b9\uff1a<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>OSI\u6a21\u578b\u662f\u6982\u5ff5\u6027\u6846\u67b6<\/strong>\uff0cTCP\/IP\u6a21\u578b\u662f\u5b9e\u9645\u5e94\u7528\u3002<\/li>\n\n\n\n<li><strong>\u8bb0\u4f4f\u6bcf\u4e00\u5c42\u7684\u540d\u79f0\u3001\u7f16\u53f7\u548c\u6838\u5fc3\u529f\u80fd\u3002<\/strong><\/li>\n\n\n\n<li><strong>\u8bb0\u4f4f\u6bcf\u4e00\u5c42\u7684\u4f20\u8f93\u5355\u4f4d\u3002<\/strong> (\u6bd4\u7279\u3001\u5e27\u3001\u6570\u636e\u5305\u3001\u6bb5\/\u6570\u636e\u62a5\u3001\u6570\u636e)<\/li>\n\n\n\n<li><strong>\u660e\u786e\u7aef\u53e3\u662f\u4f20\u8f93\u5c42 (L4) \u7684\u6982\u5ff5\u3002<\/strong> \u5f3a\u8c03\u5176\u4ed6\u5c42\u6ca1\u6709\u7aef\u53e3\u3002<\/li>\n\n\n\n<li><strong>\u80fd\u591f\u5217\u4e3e\u5e38\u89c1\u5e94\u7528\u5c42\u534f\u8bae\u53ca\u5176\u5bf9\u5e94\u7684\u7aef\u53e3\u53f7\u3002<\/strong> \u8fd9\u662fL7\u534f\u8bae\u201c\u4f7f\u7528\u201dL4\u7aef\u53e3\u7684\u4f53\u73b0\u3002<\/li>\n\n\n\n<li><strong>\u7406\u89e3\u6570\u636e\u5c01\u88c5\u548c\u89e3\u5c01\u88c5\u7684\u8fc7\u7a0b\u3002<\/strong><\/li>\n\n\n\n<li><strong>\u7406\u89e3\u5206\u5c42\u5e26\u6765\u7684\u597d\u5904<\/strong>\uff08\u6a21\u5757\u5316\u3001\u6807\u51c6\u5316\u3001\u6613\u4e8e\u7ef4\u62a4\u548c\u5347\u7ea7\uff09\u3002<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ea4\u6362\u673a\u662f\u4ec0\u4e48\uff1f\u4ea4\u6362\u673a\u7684\u79cd\u7c7b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ea4\u6362\u673a\u662f\u4ec0\u4e48\uff1f<\/h3>\n\n\n\n<p><strong>\u4ea4\u6362\u673a (Switch)<\/strong> \u662f\u4e00\u79cd\u7f51\u7edc\u8bbe\u5907\uff0c\u7528\u4e8e\u5728\u5c40\u57df\u7f51 (LAN) \u4e2d\u8fde\u63a5\u591a\u4e2a\u8ba1\u7b97\u673a\u3001\u670d\u52a1\u5668\u3001\u6253\u5370\u673a\u7b49\u8bbe\u5907\uff0c\u5e76\u5141\u8bb8\u5b83\u4eec\u4e4b\u95f4\u8fdb\u884c\u901a\u4fe1\u3002\u5b83\u5de5\u4f5c\u5728OSI\u6a21\u578b\u7684<strong>\u6570\u636e\u94fe\u8def\u5c42\uff08\u7b2c\u4e8c\u5c42\uff09<\/strong>\uff0c\u4f46\u4e5f\u6709\u4e00\u4e9b\u9ad8\u7ea7\u4ea4\u6362\u673a\u53ef\u4ee5\u5de5\u4f5c\u5728<strong>\u7f51\u7edc\u5c42\uff08\u7b2c\u4e09\u5c42\uff09<\/strong>\u3002<\/p>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u5c06\u4ea4\u6362\u673a\u60f3\u8c61\u6210\u4e00\u4e2a\u667a\u80fd\u7684\u4ea4\u901a\u6307\u6325\u4e2d\u5fc3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u667a\u80fd\u8f6c\u53d1\uff1a<\/strong> \u5f53\u6570\u636e\u5e27\uff08\u6570\u636e\u94fe\u8def\u5c42\u7684\u6570\u636e\u5355\u5143\uff09\u5230\u8fbe\u4ea4\u6362\u673a\u65f6\uff0c\u4ea4\u6362\u673a\u4f1a\u8bfb\u53d6\u5e27\u5934\u4e2d\u7684<strong>\u76ee\u6807MAC\u5730\u5740<\/strong>\u3002<\/li>\n\n\n\n<li><strong>MAC\u5730\u5740\u5b66\u4e60\uff1a<\/strong> \u4ea4\u6362\u673a\u4f1a\u7ef4\u62a4\u4e00\u4e2a<strong>MAC\u5730\u5740\u8868\uff08CAM\u8868\uff09<\/strong>\u3002\u5b83\u901a\u8fc7\u76d1\u542c\u8fde\u63a5\u5230\u5176\u7aef\u53e3\u7684\u8bbe\u5907\u53d1\u9001\u7684\u6570\u636e\u5e27\uff0c\u5b66\u4e60\u8fd9\u4e9b\u8bbe\u5907\u7684MAC\u5730\u5740\u4ee5\u53ca\u5b83\u4eec\u8fde\u63a5\u5728\u54ea\u4e2a\u7aef\u53e3\u4e0a\u3002<\/li>\n\n\n\n<li><strong>\u7cbe\u786e\u4f20\u8f93\uff1a<\/strong> \u4e00\u65e6\u4ea4\u6362\u673a\u77e5\u9053\u76ee\u6807MAC\u5730\u5740\u8fde\u63a5\u5728\u54ea\u4e2a\u7aef\u53e3\uff0c\u5b83\u5c31\u4f1a\u5c06\u6570\u636e\u5e27<strong>\u7cbe\u786e\u5730\u8f6c\u53d1\u5230\u8be5\u7aef\u53e3<\/strong>\uff0c\u800c\u4e0d\u662f\u50cf\u96c6\u7ebf\u5668\uff08Hub\uff09\u90a3\u6837\u5c06\u6570\u636e\u5e7f\u64ad\u7ed9\u6240\u6709\u7aef\u53e3\u3002\u8fd9\u5927\u5927\u63d0\u9ad8\u4e86\u7f51\u7edc\u7684\u6548\u7387\u548c\u5b89\u5168\u6027\u3002<\/li>\n\n\n\n<li><strong>\u72ec\u4eab\u5e26\u5bbd\uff1a<\/strong> \u7531\u4e8e\u4ea4\u6362\u673a\u662f\u70b9\u5bf9\u70b9\u8f6c\u53d1\uff0c\u6bcf\u4e2a\u8fde\u63a5\u5230\u4ea4\u6362\u673a\u7684\u8bbe\u5907\u90fd\u53ef\u4ee5\u83b7\u5f97<strong>\u72ec\u7acb\u7684\u5e26\u5bbd<\/strong>\uff0c\u907f\u514d\u4e86\u51b2\u7a81\u57df\u7684\u6269\u5927\uff0c\u63d0\u9ad8\u4e86\u7f51\u7edc\u6027\u80fd\u3002<\/li>\n<\/ol>\n\n\n\n<p><strong>\u6838\u5fc3\u529f\u80fd\u603b\u7ed3\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8fde\u63a5\u8bbe\u5907\uff1a<\/strong> \u5c06\u5c40\u57df\u7f51\u5185\u7684\u5404\u79cd\u8bbe\u5907\u8fde\u63a5\u8d77\u6765\u3002<\/li>\n\n\n\n<li><strong>MAC\u5730\u5740\u5b66\u4e60\uff1a<\/strong> \u81ea\u52a8\u5b66\u4e60\u8fde\u63a5\u8bbe\u5907\u7684MAC\u5730\u5740\u53ca\u5176\u5bf9\u5e94\u7684\u7aef\u53e3\u3002<\/li>\n\n\n\n<li><strong>\u5e27\u8f6c\u53d1\uff1a<\/strong> \u6839\u636eMAC\u5730\u5740\u8868\uff0c\u5c06\u6570\u636e\u5e27\u7cbe\u786e\u5730\u8f6c\u53d1\u5230\u76ee\u6807\u8bbe\u5907\u6240\u5728\u7684\u7aef\u53e3\u3002<\/li>\n\n\n\n<li><strong>\u6d88\u9664\u51b2\u7a81\u57df\uff1a<\/strong> \u6bcf\u4e2a\u4ea4\u6362\u673a\u7aef\u53e3\u90fd\u6784\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u51b2\u7a81\u57df\uff0c\u63d0\u9ad8\u4e86\u7f51\u7edc\u6548\u7387\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u4ea4\u6362\u673a\u7684\u79cd\u7c7b<\/h3>\n\n\n\n<p>\u4ea4\u6362\u673a\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u6807\u51c6\u8fdb\u884c\u5206\u7c7b\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4e3b\u8981\u7684\u5206\u7c7b\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u6309\u7ba1\u7406\u80fd\u529b\u5206\u7c7b<\/h4>\n\n\n\n<p>\u8fd9\u662f\u6700\u5e38\u89c1\u7684\u5206\u7c7b\u65b9\u5f0f\uff0c\u4e5f\u662f\u5728CTF\u4e2d\u9700\u8981\u7279\u522b\u5173\u6ce8\u7684\u4e00\u70b9\uff0c\u56e0\u4e3a\u7ba1\u7406\u578b\u4ea4\u6362\u673a\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u914d\u7f6e\u548c\u5b89\u5168\u9009\u9879\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u975e\u7ba1\u7406\u578b\u4ea4\u6362\u673a (Unmanaged Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u5373\u63d2\u5373\u7528\uff0c\u65e0\u9700\u4efb\u4f55\u914d\u7f6e\u3002\u5b83\u4eec\u6ca1\u6709\u7ba1\u7406\u754c\u9762\uff08\u5982Web\u754c\u9762\u6216\u547d\u4ee4\u884c\u63a5\u53e3\uff09\uff0c\u4e5f\u4e0d\u80fd\u8fdb\u884c\u4efb\u4f55\u9ad8\u7ea7\u8bbe\u7f6e\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u4ef7\u683c\u4fbf\u5b9c\uff0c\u5b89\u88c5\u7b80\u5355\uff0c\u9002\u5408\u5bb6\u5ead\u7f51\u7edc\u6216\u5c0f\u578b\u529e\u516c\u5ba4\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9\uff1a<\/strong> \u65e0\u6cd5\u914d\u7f6eVLAN\u3001QoS\u3001\u7aef\u53e3\u5b89\u5168\u7b49\u529f\u80fd\uff0c\u7f3a\u4e4f\u5bf9\u7f51\u7edc\u7684\u63a7\u5236\u548c\u53ef\u89c1\u6027\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u8fd9\u79cd\u4ea4\u6362\u673a\u901a\u5e38\u5b89\u5168\u98ce\u9669\u8f83\u4f4e\uff0c\u56e0\u4e3a\u6ca1\u6709\u914d\u7f6e\u6f0f\u6d1e\u53ef\u5229\u7528\uff0c\u4f46\u5176\u7f3a\u4e4f\u7ba1\u7406\u80fd\u529b\u4e5f\u4f7f\u5f97\u7f51\u7edc\u96be\u4ee5\u8fdb\u884c\u7ec6\u7c92\u5ea6\u9694\u79bb\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7ba1\u7406\u578b\u4ea4\u6362\u673a (Managed Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u7ba1\u7406\u529f\u80fd\uff0c\u53ef\u4ee5\u901a\u8fc7Web\u754c\u9762\u3001\u547d\u4ee4\u884c\u63a5\u53e3 (CLI)\u3001SNMP\u7b49\u65b9\u5f0f\u8fdb\u884c\u914d\u7f6e\u548c\u76d1\u63a7\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u63d0\u4f9b\u4e86\u5bf9\u7f51\u7edc\u7684\u5168\u9762\u63a7\u5236\uff0c\u53ef\u4ee5\u914d\u7f6eVLAN\u3001QoS\u3001\u7aef\u53e3\u955c\u50cf\u3001\u751f\u6210\u6811\u534f\u8bae (STP)\u3001\u94fe\u8def\u805a\u5408 (LACP)\u3001\u7aef\u53e3\u5b89\u5168\u3001ACLs\u7b49\u9ad8\u7ea7\u529f\u80fd\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9\uff1a<\/strong> \u4ef7\u683c\u8f83\u9ad8\uff0c\u914d\u7f6e\u590d\u6742\uff0c\u9700\u8981\u4e13\u4e1a\u7684\u7f51\u7edc\u77e5\u8bc6\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u8fd9\u662fCTF\u4e2d\u5e38\u89c1\u7684\u653b\u51fb\u76ee\u6807\uff0c\u56e0\u4e3a\u5176\u590d\u6742\u7684\u914d\u7f6e\u53ef\u80fd\u5bfc\u81f4\u6f0f\u6d1e\uff08\u5982\u5f31\u5bc6\u7801\u3001\u672a\u6388\u6743\u8bbf\u95ee\u7ba1\u7406\u754c\u9762\u3001\u914d\u7f6e\u9519\u8bef\u5bfc\u81f4\u7684\u5b89\u5168\u7b56\u7565\u7ed5\u8fc7\u3001SNMP\u793e\u533a\u5b57\u7b26\u4e32\u6cc4\u9732\u7b49\uff09\u3002\u4e86\u89e3\u5176\u7ba1\u7406\u529f\u80fd\u5bf9\u4e8e\u7f51\u7edc\u4fa6\u5bdf\u548c\u6f0f\u6d1e\u5229\u7528\u81f3\u5173\u91cd\u8981\u3002<\/li>\n\n\n\n<li>\u5b50\u5206\u7c7b\uff1a\n<ul class=\"wp-block-list\">\n<li><strong>\u667a\u80fd\u4ea4\u6362\u673a \/ Web\u7ba1\u7406\u578b\u4ea4\u6362\u673a (Smart\/Web-Managed Switches)\uff1a<\/strong> \u63d0\u4f9b\u57fa\u672c\u7684Web\u7ba1\u7406\u754c\u9762\uff0c\u529f\u80fd\u4ecb\u4e8e\u975e\u7ba1\u7406\u578b\u548c\u5168\u7ba1\u7406\u578b\u4e4b\u95f4\uff0c\u901a\u5e38\u9002\u5408\u4e2d\u5c0f\u578b\u4f01\u4e1a\u3002<\/li>\n\n\n\n<li><strong>\u4f01\u4e1a\u7ea7\u7ba1\u7406\u578b\u4ea4\u6362\u673a (Enterprise-grade Managed Switches)\uff1a<\/strong> \u529f\u80fd\u6700\u5168\u9762\uff0c\u901a\u5e38\u901a\u8fc7CLI\u8fdb\u884c\u9ad8\u7ea7\u914d\u7f6e\uff0c\u652f\u6301\u590d\u6742\u7684\u7f51\u7edc\u62d3\u6251\u548c\u5b89\u5168\u7b56\u7565\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. \u6309\u5de5\u4f5c\u5c42\u6b21\u5206\u7c7b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e8c\u5c42\u4ea4\u6362\u673a (Layer 2 Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u57fa\u4e8eMAC\u5730\u5740\u8fdb\u884c\u6570\u636e\u5e27\u8f6c\u53d1\uff0c\u5de5\u4f5c\u5728OSI\u6a21\u578b\u7684\u6570\u636e\u94fe\u8def\u5c42\u3002<\/li>\n\n\n\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u4e3b\u8981\u7528\u4e8e\u8fde\u63a5\u540c\u4e00\u5c40\u57df\u7f51\u5185\u7684\u8bbe\u5907\uff0c\u5b9e\u73b0\u8bbe\u5907\u95f4\u7684\u901a\u4fe1\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> \u5927\u591a\u6570\u5e38\u89c1\u7684\u4ea4\u6362\u673a\u90fd\u662f\u4e8c\u5c42\u4ea4\u6362\u673a\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> ARP\u6b3a\u9a97\u3001MAC\u6cdb\u6d2a\u7b49\u653b\u51fb\u901a\u5e38\u9488\u5bf9\u4e8c\u5c42\u4ea4\u6362\u673a\u3002\u7406\u89e3VLAN\uff08\u865a\u62df\u5c40\u57df\u7f51\uff09\u5728\u4e8c\u5c42\u4ea4\u6362\u673a\u4e0a\u7684\u5b9e\u73b0\u5bf9\u4e8e\u7406\u89e3\u7f51\u7edc\u9694\u79bb\u548c\u7a81\u7834\u9694\u79bb\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4e09\u5c42\u4ea4\u6362\u673a (Layer 3 Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u9664\u4e86\u5177\u5907\u4e8c\u5c42\u4ea4\u6362\u673a\u7684\u8f6c\u53d1\u529f\u80fd\u5916\uff0c\u8fd8\u5177\u5907\u90e8\u5206\u8def\u7531\u5668\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u57fa\u4e8eIP\u5730\u5740\u8fdb\u884c\u6570\u636e\u5305\u8f6c\u53d1\uff08\u8def\u7531\uff09\u3002\u5b83\u5de5\u4f5c\u5728OSI\u6a21\u578b\u7684\u7f51\u7edc\u5c42\u3002<\/li>\n\n\n\n<li><strong>\u529f\u80fd\uff1a<\/strong> \u53ef\u4ee5\u5b9e\u73b0\u4e0d\u540cVLAN\u4e4b\u95f4\u7684\u8def\u7531\uff08VLAN\u95f4\u8def\u7531\uff09\uff0c\u4ee5\u53ca\u8fde\u63a5\u4e0d\u540c\u7684\u5b50\u7f51\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u8def\u7531\u901f\u5ea6\u6bd4\u4f20\u7edf\u8def\u7531\u5668\u5feb\uff08\u56e0\u4e3a\u662f\u786c\u4ef6\u8f6c\u53d1\uff09\uff0c\u9002\u7528\u4e8e\u5927\u578b\u7f51\u7edc\u7684\u6838\u5fc3\u5c42\u6216\u6c47\u805a\u5c42\uff0c\u9700\u8981\u9ad8\u6027\u80fd\u8def\u7531\u7684\u573a\u666f\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u4e86\u89e3\u4e09\u5c42\u4ea4\u6362\u673a\u7684\u8def\u7531\u529f\u80fd\u5bf9\u4e8e\u7406\u89e3\u7f51\u7edc\u5206\u6bb5\u3001\u8def\u7531\u7b56\u7565\u548c\u6f5c\u5728\u7684\u8def\u7531\u6f0f\u6d1e\uff08\u5982BGP\u52ab\u6301\u3001OSPF\/EIGRP\u8def\u7531\u534f\u8bae\u6f0f\u6d1e\uff09\u975e\u5e38\u91cd\u8981\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. \u6309\u7aef\u53e3\u914d\u7f6e\u5206\u7c7b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56fa\u5b9a\u914d\u7f6e\u4ea4\u6362\u673a (Fixed Configuration Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u7aef\u53e3\u6570\u91cf\u548c\u7c7b\u578b\u662f\u56fa\u5b9a\u7684\uff0c\u4e0d\u80fd\u6269\u5c55\u6216\u66f4\u6539\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u6210\u672c\u8f83\u4f4e\uff0c\u7ed3\u6784\u7d27\u51d1\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> \u9002\u7528\u4e8e\u7aef\u53e3\u9700\u6c42\u76f8\u5bf9\u7a33\u5b9a\u7684\u5c0f\u578b\u5230\u4e2d\u578b\u7f51\u7edc\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u6a21\u5757\u5316\u4ea4\u6362\u673a (Modular Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u5141\u8bb8\u7528\u6237\u6839\u636e\u9700\u6c42\u63d2\u5165\u6216\u66f4\u6362\u4e0d\u540c\u7684\u6a21\u5757\uff0c\u4f8b\u5982\u4e0d\u540c\u6570\u91cf\u548c\u7c7b\u578b\u7684\u7aef\u53e3\u6a21\u5757\u3001\u7535\u6e90\u6a21\u5757\u3001\u7ba1\u7406\u6a21\u5757\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u7075\u6d3b\u6027\u9ad8\uff0c\u53ef\u6269\u5c55\u6027\u5f3a\uff0c\u652f\u6301\u5197\u4f59\u914d\u7f6e\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> \u9002\u7528\u4e8e\u5927\u578b\u4f01\u4e1a\u7f51\u7edc\u3001\u6570\u636e\u4e2d\u5fc3\u7684\u6838\u5fc3\u5c42\uff0c\u9700\u8981\u9ad8\u53ef\u7528\u6027\u548c\u672a\u6765\u6269\u5c55\u6027\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4. \u6309\u662f\u5426\u652f\u6301PoE\u5206\u7c7b<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>PoE \u4ea4\u6362\u673a (Power over Ethernet Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u80fd\u591f\u901a\u8fc7\u4ee5\u592a\u7f51\u7ebf\u7f06\u540c\u65f6\u4e3a\u8fde\u63a5\u7684\u8bbe\u5907\u63d0\u4f9b\u6570\u636e\u4f20\u8f93\u548c\u7535\u529b\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9\uff1a<\/strong> \u7b80\u5316\u5e03\u7ebf\uff0c\u65b9\u4fbf\u90e8\u7f72IP\u7535\u8bdd\u3001\u65e0\u7ebf\u63a5\u5165\u70b9 (AP)\u3001\u7f51\u7edc\u6444\u50cf\u5934\u7b49\u8bbe\u5907\u3002<\/li>\n\n\n\n<li><strong>CTF\u76f8\u5173\uff1a<\/strong> \u4e86\u89e3PoE\u4f9b\u7535\u673a\u5236\u53ef\u4ee5\u5e2e\u52a9\u8bc6\u522b\u7f51\u7edc\u4e2d\u7684\u7279\u5b9a\u8bbe\u5907\uff0c\u6216\u8005\u5728\u7269\u7406\u8bbf\u95ee\u53d7\u9650\u7684\u60c5\u51b5\u4e0b\uff0c\u5229\u7528PoE\u4f9b\u7535\u7684\u7279\u6027\u8fdb\u884c\u4e00\u4e9b\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u975ePoE \u4ea4\u6362\u673a (Non-PoE Switches)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u7279\u70b9\uff1a<\/strong> \u53ea\u63d0\u4f9b\u6570\u636e\u4f20\u8f93\u529f\u80fd\uff0c\u4e0d\u63d0\u4f9b\u7535\u529b\u3002<\/li>\n\n\n\n<li><strong>\u5e94\u7528\uff1a<\/strong> \u5927\u591a\u6570\u4f20\u7edf\u4ea4\u6362\u673a\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u8282\u70b9<\/h2>\n\n\n\n<p>\u201c\u8282\u70b9\u201d\uff08Node\uff09\u662f\u4e00\u4e2a\u975e\u5e38\u901a\u7528\u4e14\u57fa\u7840\u7684\u8ba1\u7b97\u673a\u79d1\u5b66\u548c\u7f51\u7edc\u9886\u57df\u7684\u672f\u8bed\u3002\u5b83\u7684\u5177\u4f53\u542b\u4e49\u4f1a\u6839\u636e\u4f60\u6240\u8ba8\u8bba\u7684<strong>\u4e0a\u4e0b\u6587<\/strong>\u800c\u6709\u6240\u4e0d\u540c\uff0c\u4f46\u6838\u5fc3\u601d\u60f3\u662f\u76f8\u4f3c\u7684\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6838\u5fc3\u601d\u60f3<\/h3>\n\n\n\n<p>\u4e00\u4e2a\u201c\u8282\u70b9\u201d\u901a\u5e38\u6307\u7684\u662f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7cfb\u7edf\u4e2d\u7684\u4e00\u4e2a\u70b9\u6216\u5b9e\u4f53\uff1a<\/strong> \u5b83\u662f\u67d0\u4e2a\u66f4\u5927\u7cfb\u7edf\u3001\u7ed3\u6784\u6216\u7f51\u7edc\u4e2d\u7684\u4e00\u4e2a<strong>\u57fa\u672c\u7ec4\u6210\u5355\u5143<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u5177\u6709\u7279\u5b9a\u529f\u80fd\uff1a<\/strong> \u8fd9\u4e2a\u70b9\u6216\u5b9e\u4f53\u901a\u5e38\u5177\u6709\u67d0\u79cd\u5904\u7406\u3001\u5b58\u50a8\u3001\u8f6c\u53d1\u6216\u53c2\u4e0e\u7279\u5b9a\u4efb\u52a1\u7684\u80fd\u529b\u3002<\/li>\n\n\n\n<li><strong>\u4e0e\u5176\u4ed6\u70b9\u4ea4\u4e92\uff1a<\/strong> \u5b83\u901a\u5e38\u4e0e\u5176\u4ed6\u8282\u70b9\u76f8\u4e92\u8fde\u63a5\u3001\u901a\u4fe1\u6216\u534f\u4f5c\u3002<\/li>\n<\/ol>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u628a\u201c\u8282\u70b9\u201d\u60f3\u8c61\u6210\u4e00\u4e2a<strong>\u7f51\u7edc\u4e2d\u7684\u201c\u505c\u9760\u7ad9\u201d<\/strong>\uff0c\u6216\u8005\u4e00\u4e2a<strong>\u7ed3\u6784\u4e2d\u7684\u201c\u7816\u5757\u201d<\/strong>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e0d\u540c\u9886\u57df\u7684\u201c\u8282\u70b9\u201d<\/h3>\n\n\n\n<p>\u4e3a\u4e86\u8ba9\u4f60\u66f4\u6e05\u695a\u5730\u7406\u89e3\uff0c\u6211\u4eec\u6765\u770b\u770b\u5728\u4e0d\u540c\u4e0a\u4e0b\u6587\u4e2d\uff0c\u201c\u8282\u70b9\u201d\u5177\u4f53\u6307\u4ec0\u4e48\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1. \u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d\u7684\u201c\u8282\u70b9\u201d (CTF\u4e2d\u6700\u5e38\u89c1\u542b\u4e49)<\/h4>\n\n\n\n<p>\u5728\u8ba1\u7b97\u673a\u7f51\u7edc\u4e2d\uff0c\u201c\u8282\u70b9\u201d\u662f\u6700\u5e38\u89c1\u7684\u7528\u6cd5\uff0c\u5b83\u6307\u7684\u662f<strong>\u4efb\u4f55\u8fde\u63a5\u5230\u7f51\u7edc\u7684\u8bbe\u5907\u6216\u8ba1\u7b97\u673a<\/strong>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b\u5b50\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f60\u7684<strong>\u7535\u8111<\/strong> (PC)<\/li>\n\n\n\n<li><strong>\u670d\u52a1\u5668<\/strong> (Server)<\/li>\n\n\n\n<li><strong>\u8def\u7531\u5668<\/strong> (Router)<\/li>\n\n\n\n<li><strong>\u4ea4\u6362\u673a<\/strong> (Switch)<\/li>\n\n\n\n<li><strong>\u6253\u5370\u673a<\/strong> (Printer)<\/li>\n\n\n\n<li><strong>\u667a\u80fd\u624b\u673a<\/strong> (Smartphone)<\/li>\n\n\n\n<li><strong>\u7269\u8054\u7f51\u8bbe\u5907<\/strong> (IoT Device\uff0c\u5982\u667a\u80fd\u6444\u50cf\u5934\u3001\u667a\u80fd\u97f3\u7bb1)<\/li>\n\n\n\n<li>\u4efb\u4f55\u5177\u6709<strong>\u7f51\u7edc\u63a5\u53e3<\/strong>\u5e76\u80fd\u591f\u53d1\u9001\u6216\u63a5\u6536\u6570\u636e\u7684\u8bbe\u5907\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u6bcf\u4e2a\u8282\u70b9\u901a\u5e38\u90fd\u6709\u4e00\u4e2a<strong>\u552f\u4e00\u7684\u7f51\u7edc\u5730\u5740<\/strong>\uff08\u5982MAC\u5730\u5740\u548cIP\u5730\u5740\uff09\u3002<\/li>\n\n\n\n<li>\u5b83\u4eec\u901a\u8fc7\u7f51\u7edc\u4ecb\u8d28\uff08\u5982\u7f51\u7ebf\u3001Wi-Fi\uff09\u76f8\u4e92\u8fde\u63a5\u3002<\/li>\n\n\n\n<li>\u5b83\u4eec\u80fd\u591f\u4e0e\u5176\u4ed6\u8282\u70b9\u8fdb\u884c\u6570\u636e\u901a\u4fe1\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>CTF\u4e2d\u7684\u610f\u4e49\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5728CTF\u4e2d\u8fdb\u884c\u7f51\u7edc\u6e17\u900f\u6d4b\u8bd5\u65f6\uff0c\u4f60\u9996\u5148\u8981\u505a\u7684\u5c31\u662f<strong>\u8bc6\u522b\u7f51\u7edc\u4e2d\u6709\u54ea\u4e9b\u8282\u70b9<\/strong>\uff08\u8bbe\u5907\uff09\uff0c\u5b83\u4eec\u662f\u4ec0\u4e48\u7c7b\u578b\uff0c\u8fd0\u884c\u4ec0\u4e48\u670d\u52a1\uff0c\u4ee5\u53ca\u5b83\u4eec\u4e4b\u95f4\u7684\u8fde\u63a5\u5173\u7cfb\u3002<\/li>\n\n\n\n<li>\u653b\u51fb\u76ee\u6807\u5f80\u5f80\u662f\u7f51\u7edc\u4e2d\u7684\u67d0\u4e2a\u6216\u67d0\u7ec4\u8282\u70b9\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">2. \u6570\u636e\u7ed3\u6784\u4e0e\u7b97\u6cd5\u4e2d\u7684\u201c\u8282\u70b9\u201d<\/h4>\n\n\n\n<p>\u5728\u8ba1\u7b97\u673a\u79d1\u5b66\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff0c\u201c\u8282\u70b9\u201d\u662f\u6784\u5efa\u590d\u6742\u6570\u636e\u7ed3\u6784\uff08\u5982\u94fe\u8868\u3001\u6811\u3001\u56fe\uff09\u7684\u57fa\u672c\u5355\u5143\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b\u5b50\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u94fe\u8868 (Linked List) \u4e2d\u7684\u8282\u70b9\uff1a<\/strong> \u901a\u5e38\u5305\u542b\u4e24\u90e8\u5206\u2014\u2014\u6570\u636e\u672c\u8eab\uff0c\u4ee5\u53ca\u4e00\u4e2a\u6307\u5411\u4e0b\u4e00\u4e2a\u8282\u70b9\u7684\u6307\u9488\uff08\u6216\u5f15\u7528\uff09\u3002 <code>[\u6570\u636e | \u6307\u5411\u4e0b\u4e00\u4e2a\u8282\u70b9\u7684\u6307\u9488]<\/code><\/li>\n\n\n\n<li><strong>\u6811 (Tree) \u4e2d\u7684\u8282\u70b9\uff1a<\/strong> \u5305\u542b\u6570\u636e\uff0c\u4ee5\u53ca\u6307\u5411\u5176\u5b50\u8282\u70b9\u7684\u6307\u9488\u3002\u6811\u6709\u6839\u8282\u70b9 (Root Node)\u3001\u7236\u8282\u70b9 (Parent Node)\u3001\u5b50\u8282\u70b9 (Child Node) \u548c\u53f6\u8282\u70b9 (Leaf Node) \u7b49\u6982\u5ff5\u3002 <code>[\u6570\u636e | \u6307\u5411\u5b50\u8282\u70b9\u7684\u6307\u9488]<\/code><\/li>\n\n\n\n<li><strong>\u56fe (Graph) \u4e2d\u7684\u8282\u70b9\uff1a<\/strong> \u4e5f\u79f0\u4e3a\u201c\u9876\u70b9\u201d\uff08Vertex\uff09\uff0c\u4ee3\u8868\u56fe\u4e2d\u7684\u4e00\u4e2a\u5b9e\u4f53\uff0c\u53ef\u4ee5\u6709\u6570\u636e\uff0c\u5e76\u901a\u8fc7\u201c\u8fb9\u201d\uff08Edge\uff09\u4e0e\u5176\u4ed6\u8282\u70b9\u8fde\u63a5\u3002 <code>[\u6570\u636e]<\/code><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u7279\u70b9\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5b58\u50a8\u6570\u636e\u3002<\/li>\n\n\n\n<li>\u5305\u542b\u6307\u5411\u5176\u4ed6\u8282\u70b9\u7684\u94fe\u63a5\uff0c\u4ece\u800c\u5f62\u6210\u7279\u5b9a\u7684\u7ed3\u6784\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3. \u5206\u5e03\u5f0f\u7cfb\u7edf\u548c\u533a\u5757\u94fe\u4e2d\u7684\u201c\u8282\u70b9\u201d<\/h4>\n\n\n\n<p>\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u548c\u533a\u5757\u94fe\u6280\u672f\u4e2d\uff0c\u201c\u8282\u70b9\u201d\u6307\u7684\u662f\u53c2\u4e0e\u5230\u8fd9\u4e2a\u5206\u5e03\u5f0f\u7f51\u7edc\u4e2d\u7684<strong>\u6bcf\u4e00\u53f0\u72ec\u7acb\u7684\u8ba1\u7b97\u673a\u6216\u670d\u52a1\u5668<\/strong>\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f8b\u5b50\uff1a<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>\u533a\u5757\u94fe\u7f51\u7edc\u4e2d\u7684\u8282\u70b9\uff1a<\/strong> 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