{"id":2268,"date":"2026-05-19T17:38:16","date_gmt":"2026-05-19T09:38:16","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=2268"},"modified":"2026-05-19T17:38:17","modified_gmt":"2026-05-19T09:38:17","slug":"dns%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/05\/19\/dns%e6%9f%a5%e8%af%a2\/preluna\/text\/","title":{"rendered":"DNS\u67e5\u8be2"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/05\/1011-1-343x1024.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"343\" height=\"1024\" 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class=\"wp-block-paragraph\">\u8fd9\u91cc\u6700\u5bb9\u6613\u9519\u7684\u5730\u65b9\u662f\u628a\u201c\u89e3\u6790\u8fc7\u7a0b\u7ecf\u8fc7\u591a\u4e2a\u57df\u540d\u670d\u52a1\u5668\u201d\u8bef\u8ba4\u4e3a\u201c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u4e00\u5b9a\u53d1\u591a\u6761\u8bf7\u6c42\u201d\u3002\u5176\u5b9e\u8981\u770b\u67e5\u8be2\u65b9\u5f0f\u3002\u5982\u679c\u662f\u8fed\u4ee3\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u81ea\u5df1\u9010\u7ea7\u95ee\uff0c\u6240\u4ee5\u591a\u6761\uff1b\u5982\u679c\u662f\u9012\u5f52\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53ea\u628a\u95ee\u9898\u4ea4\u7ed9\u4e0b\u4e00\u7ea7\uff0c\u6240\u4ee5\u5b83\u81ea\u5df1\u53ea\u53d1\u4e00\u6761\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c 12 \u9898\u548c\u524d\u4e24\u9898\u53c8\u4e0d\u4e00\u6837\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9898\u5e72\u8bf4\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u6240\u6709\u57df\u540d\u670d\u52a1\u5668\u5747\u91c7\u7528\u8fed\u4ee3\u67e5\u8be2\u65b9\u5f0f\u8fdb\u884c\u57df\u540d\u89e3\u6790\u3002\u5f53\u4e3b\u673a\u8bbf\u95ee\u89c4\u8303\u57df\u540d <a href=\"http:\/\/www.abc.xyz.com\/\">www.abc.xyz.com<\/a> \u7684\u7f51\u7ad9\u65f6\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u5728\u5b8c\u6210\u8be5\u57df\u540d\u89e3\u6790\u7684\u8fc7\u7a0b\u4e2d\uff0c\u53ef\u80fd\u53d1\u51fa DNS \u67e5\u8be2\u7684\u6700\u5c11\u548c\u6700\u591a\u6b21\u6570\u5206\u522b\u662f\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u9898\u4e0d\u518d\u95ee\u201c\u7528\u6237\u4e3b\u673a\u548c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u5206\u522b\u53d1\u51e0\u6761\u201d\uff0c\u800c\u662f\u53ea\u95ee\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53ef\u80fd\u53d1\u51fa\u591a\u5c11\u6b21 DNS \u67e5\u8be2\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e76\u4e14\u9898\u76ee\u6ca1\u6709\u8bf4\u201c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u65e0\u7f13\u5b58\u201d\u3002\u6240\u4ee5\u6700\u5c11\u6b21\u6570\u8981\u8003\u8651\u7f13\u5b58\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u4e2d\u5df2\u7ecf\u7f13\u5b58\u4e86 <code>www.abc.xyz.com<\/code> \u5bf9\u5e94\u7684 IP \u5730\u5740\uff0c\u90a3\u4e48\u5b83\u4e0d\u9700\u8981\u518d\u5411\u5916\u90e8\u57df\u540d\u670d\u52a1\u5668\u53d1\u67e5\u8be2\u8bf7\u6c42\uff0c\u76f4\u63a5\u8fd4\u56de\u7ed9\u4e3b\u673a\u5373\u53ef\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u6700\u5c11\u662f 0 \u6b21\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u591a\u6b21\u6570\u8981\u6309\u57df\u540d\u5c42\u6b21\u6765\u6570\u3002<code>www.abc.xyz.com<\/code> \u7684\u5b8c\u6574\u5c42\u6b21\u53ef\u4ee5\u7406\u89e3\u4e3a\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u57df <code>.<\/code><br>\u9876\u7ea7\u57df <code>com<\/code><br>\u4e8c\u7ea7\u57df <code>xyz.com<\/code><br>\u4e09\u7ea7\u57df <code>abc.xyz.com<\/code><br>\u4e3b\u673a\u540d <code>www.abc.xyz.com<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u6700\u4e0d\u5229\u60c5\u51b5\u4e0b\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u6ca1\u6709\u4efb\u4f55\u7f13\u5b58\uff0c\u5e76\u4e14\u6bcf\u4e00\u7ea7\u90fd\u9700\u8981\u9010\u7ea7\u8fed\u4ee3\u67e5\u8be2\uff0c\u90a3\u4e48\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53ef\u80fd\u4f9d\u6b21\u67e5\u8be2\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u95ee\u6839\u57df\u540d\u670d\u52a1\u5668\uff1a\u8c01\u8d1f\u8d23 <code>com<\/code>\uff1f<\/li>\n\n\n\n<li>\u95ee <code>com<\/code> \u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668\uff1a\u8c01\u8d1f\u8d23 <code>xyz.com<\/code>\uff1f<\/li>\n\n\n\n<li>\u95ee <code>xyz.com<\/code> \u57df\u540d\u670d\u52a1\u5668\uff1a\u8c01\u8d1f\u8d23 <code>abc.xyz.com<\/code>\uff1f<\/li>\n\n\n\n<li>\u95ee <code>abc.xyz.com<\/code> \u6743\u9650\u57df\u540d\u670d\u52a1\u5668\uff1a<code>www.abc.xyz.com<\/code> \u7684 IP \u662f\u4ec0\u4e48\uff1f<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u6700\u591a\u662f 4 \u6b21\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\u7b2c 12 \u9898\u9009 C\uff1a0\uff0c4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u9898\u5bb9\u6613\u9519\u9009 A\uff1a0\uff0c3\u3002\u9519\u56e0\u901a\u5e38\u662f\u6f0f\u6570\u4e86\u201c\u6839\u57df\u540d\u670d\u52a1\u5668\u201d\u8fd9\u4e00\u5c42\uff0c\u6216\u8005\u628a\u6700\u540e\u4e00\u6b21\u5411\u6743\u9650\u57df\u540d\u670d\u52a1\u5668\u67e5\u8be2\u4e3b\u673a IP \u7684\u8fc7\u7a0b\u6f0f\u6389\u4e86\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e09\u7c7b\u9898\u53ef\u4ee5\u8fd9\u6837\u533a\u5206\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u9898\u578b<\/th><th>\u770b\u9898\u5e72\u5173\u952e\u8bcd<\/th><th>\u89e3\u9898\u91cd\u70b9<\/th><th>\u5178\u578b\u7ed3\u8bba<\/th><\/tr><\/thead><tbody><tr><td>\u7b2c 10 \u7c7b<\/td><td>\u201c\u4e3b\u673a\u9012\u5f52\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u8fed\u4ee3\u201d<\/td><td>\u672c\u5730 DNS \u8981\u81ea\u5df1\u9010\u7ea7\u95ee<\/td><td>\u4e3b\u673a 1 \u6761\uff0c\u672c\u5730 DNS \u591a\u6761<\/td><\/tr><tr><td>\u7b2c 11 \u7c7b<\/td><td>\u201c\u91c7\u7528\u9012\u5f52\u65b9\u6cd5\u89e3\u6790\u201d<\/td><td>\u6bcf\u4e00\u7ea7\u53ea\u628a\u8bf7\u6c42\u4ea4\u7ed9\u4e0b\u4e00\u7ea7<\/td><td>\u4e3b\u673a 1 \u6761\uff0c\u672c\u5730 DNS 1 \u6761<\/td><\/tr><tr><td>\u7b2c 12 \u7c7b<\/td><td>\u201c\u6240\u6709\u670d\u52a1\u5668\u8fed\u4ee3\u201d\u201c\u6700\u5c11\u548c\u6700\u591a\u6b21\u6570\u201d\u201c\u5177\u4f53\u57df\u540d\u201d<\/td><td>\u8003\u7f13\u5b58 + \u57df\u540d\u5c42\u6b21<\/td><td>\u6700\u5c11\u770b\u7f13\u5b58\uff0c\u6700\u591a\u6309\u5c42\u6b21\u6570<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u505a\u8fd9\u7c7b\u9898\u65f6\uff0c\u5148\u4e0d\u8981\u6025\u7740\u6570\u6839\u3001\u9876\u7ea7\u57df\u3001\u6743\u9650\u57df\uff0c\u800c\u662f\u5148\u5224\u65ad\u9898\u76ee\u95ee\u7684\u662f\u54ea\u4e00\u79cd\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u95ee\u201c\u7528\u6237\u4e3b\u673a\u53d1\u9001\u51e0\u6761\u201d\uff0c\u901a\u5e38\u662f 1 \u6761\uff0c\u56e0\u4e3a\u7528\u6237\u4e3b\u673a\u4e00\u822c\u53ea\u95ee\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u95ee\u201c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53d1\u9001\u51e0\u6761\u201d\uff0c\u5c31\u8981\u770b\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u5411\u5916\u90e8\u91c7\u7528\u4ec0\u4e48\u65b9\u5f0f\u3002\u91c7\u7528\u9012\u5f52\uff0c\u4e00\u822c\u662f 1 \u6761\uff1b\u91c7\u7528\u8fed\u4ee3\uff0c\u4e00\u822c\u662f\u591a\u6761\uff0c\u9700\u8981\u9010\u7ea7\u67e5\u8be2\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u95ee\u201c\u6700\u5c11\u3001\u6700\u591a\u201d\uff0c\u4e00\u5b9a\u8981\u770b\u6709\u6ca1\u6709\u8bf4\u201c\u65e0\u7f13\u5b58\u201d\u3002\u9898\u76ee\u6ca1\u6709\u660e\u786e\u65e0\u7f13\u5b58\u65f6\uff0c\u6700\u5c11\u53ef\u80fd\u662f 0\uff0c\u56e0\u4e3a\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53ef\u80fd\u5df2\u7ecf\u7f13\u5b58\u4e86\u7ed3\u679c\u3002\u9898\u76ee\u660e\u786e\u201c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u65e0\u7f13\u5b58\u201d\u65f6\uff0c\u5c31\u4e0d\u80fd\u518d\u628a\u6700\u5c11\u7b97\u6210 0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u540e\u518d\u770b\u662f\u4e0d\u662f\u7ed9\u4e86\u5177\u4f53\u57df\u540d\u3002\u5982\u679c\u7ed9\u4e86 <code>www.abc.xyz.com<\/code> \u8fd9\u79cd\u57df\u540d\uff0c\u901a\u5e38\u5c31\u8981\u6309\u5c42\u6b21\u8ba1\u7b97\u6700\u5927\u8fed\u4ee3\u6b21\u6570\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6839\u670d\u52a1\u5668 \u2192 \u9876\u7ea7\u57df\u670d\u52a1\u5668 \u2192 \u4e8c\u7ea7\u57df\u6743\u9650\u670d\u52a1\u5668 \u2192 \u66f4\u4e0b\u7ea7\u6743\u9650\u670d\u52a1\u5668 \u2192 \u76ee\u6807\u4e3b\u673a\u8bb0\u5f55<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u7b2c 12 \u9898\u7684\u6700\u591a\u6b21\u6570\u662f 4\uff0c\u800c\u4e0d\u662f 3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/05\/DNS\u67e5\u8be2-1024x768.jpg'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-original=\"http:\/\/www.preluna.xyz\/wp-content\/uploads\/2026\/05\/DNS\u67e5\u8be2-1024x768.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-2273\"  sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7b2c14\u9898\u7684\u5173\u952e\u4e0d\u662f\u201c\u53ea\u8003\u8651 Web \u8bf7\u6c42\u7684 TCP \u4e09\u6b21\u63e1\u624b\u201d\uff0c\u800c\u662f\u8981\u5206\u6e05\u4e24\u7c7b\u8fc7\u7a0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u7c7b\u662f <strong>DNS \u57df\u540d\u89e3\u6790\u8fc7\u7a0b<\/strong>\uff0c\u901a\u5e38\u6309 <strong>UDP \u67e5\u8be2\/\u54cd\u5e94<\/strong> \u8ba1\u7b97\uff0c\u4e0d\u5efa\u7acb TCP \u8fde\u63a5\uff0c\u6240\u4ee5\u4e0d\u9700\u8981 TCP \u4e09\u6b21\u63e1\u624b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u4e00\u7c7b\u662f <strong>HTTP \u8bbf\u95ee Web \u670d\u52a1\u5668\u8fc7\u7a0b<\/strong>\uff0cHTTP \u8fd0\u884c\u5728 TCP \u4e4b\u4e0a\uff0c\u6240\u4ee5\u8bbf\u95ee <code>www.abc.com<\/code> \u7684 Web \u9875\u9762\u65f6\uff0c\u9700\u8981\u5148\u5efa\u7acb TCP \u8fde\u63a5\uff0c\u518d\u53d1\u9001 HTTP \u8bf7\u6c42\u5e76\u63a5\u6536\u54cd\u5e94\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u9898\u7b54\u6848\u5e94\u4e3a\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. 20ms\uff0c50ms<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7406\u89e3\u5982\u4e0b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6d4f\u89c8\u5668\u70b9\u51fb\u8d85\u94fe\u63a5 <code>http:\/\/www.abc.com\/index.html<\/code> \u540e\uff0c\u9996\u5148\u8981\u77e5\u9053 <code>www.abc.com<\/code> \u5bf9\u5e94\u7684 IP \u5730\u5740\uff0c\u8fd9\u4e00\u6b65\u9760 DNS \u67e5\u8be2\u5b8c\u6210\u3002\u666e\u901a DNS \u67e5\u8be2\u9ed8\u8ba4\u4f7f\u7528 UDP 53 \u7aef\u53e3\uff0c\u4e0d\u662f TCP \u8fde\u63a5\uff0c\u56e0\u6b64\u4e0d\u4f1a\u51fa\u73b0\u201c\u548c\u6839\u57df\u540d\u670d\u52a1\u5668\u3001com \u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668\u3001abc.com \u57df\u540d\u670d\u52a1\u5668\u5206\u522b\u8fdb\u884c TCP \u4e09\u6b21\u63e1\u624b\u201d\u7684\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f46\u662f\uff0c\u867d\u7136 DNS \u4e0d\u8fdb\u884c TCP \u4e09\u6b21\u63e1\u624b\uff0cDNS \u67e5\u8be2\u672c\u8eab\u4ecd\u7136\u6709\u5f80\u8fd4\u65f6\u5ef6 RTT\u3002\u9898\u76ee\u8bf4\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u53ea\u63d0\u4f9b\u9012\u5f52\u67e5\u8be2\u670d\u52a1\uff0c\u5176\u4ed6\u57df\u540d\u670d\u52a1\u5668\u53ea\u63d0\u4f9b\u8fed\u4ee3\u67e5\u8be2\u670d\u52a1\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u610f\u601d\u662f\u4e3b\u673a H \u628a\u67e5\u8be2\u8bf7\u6c42\u4ea4\u7ed9\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u518d\u4f9d\u6b21\u53bb\u95ee\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6839\u57df\u540d\u670d\u52a1\u5668\n\u2192 com \u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668\n\u2192 abc.com \u57df\u540d\u670d\u52a1\u5668\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\u679c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u6ca1\u6709\u7f13\u5b58\uff0c\u6700\u957f\u60c5\u51b5\u4e0b\u8981\u7ecf\u8fc7 3 \u6b21 Internet \u4e0a\u7684 DNS \u67e5\u8be2\uff0c\u6bcf\u6b21 RTT \u4e3a 10ms\uff0c\u6240\u4ee5 DNS \u89e3\u6790\u6700\u957f\u8017\u65f6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>3 \u00d7 10ms = 30ms\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7136\u540e\u6d4f\u89c8\u5668\u624d\u80fd\u8bbf\u95ee\u771f\u6b63\u7684 Web \u670d\u52a1\u5668 <code>www.abc.com<\/code>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bbf\u95ee Web \u9875\u9762\u65f6\uff0c\u56e0\u4e3a HTTP \u57fa\u4e8e TCP\uff0c\u6240\u4ee5\u8981\u8003\u8651\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP \u4e09\u6b21\u63e1\u624b\uff1a1 \u4e2a RTT = 10ms\nHTTP \u8bf7\u6c42\u5e76\u63a5\u6536\u54cd\u5e94\uff1a1 \u4e2a RTT = 10ms\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5 Web \u8bbf\u95ee\u9636\u6bb5\u8017\u65f6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>2 \u00d7 10ms = 20ms\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u6b64\u6700\u957f\u65f6\u95f4\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>DNS \u89e3\u6790 30ms + Web \u8bbf\u95ee 20ms = 50ms\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6700\u77ed\u60c5\u51b5\u4e0b\uff0c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u5df2\u7ecf\u7f13\u5b58\u4e86 <code>www.abc.com<\/code> \u7684 IP \u5730\u5740\uff0c\u672c\u5730\u67e5\u8be2\u65f6\u5ef6\u9898\u76ee\u4e00\u822c\u5ffd\u7565\uff0c\u56e0\u6b64 DNS \u89e3\u6790\u53ef\u4ee5\u8ba4\u4e3a\u4e0d\u7ecf\u8fc7 Internet \u67e5\u8be2\u3002\u6b64\u65f6\u53ea\u9700\u8981\u8003\u8651 Web \u8bbf\u95ee\u9636\u6bb5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>TCP \u4e09\u6b21\u63e1\u624b 10ms + HTTP \u8bf7\u6c42\/\u54cd\u5e94 10ms = 20ms\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6240\u4ee5\u6700\u77ed\u65f6\u95f4\u662f 20ms\uff0c\u6700\u957f\u65f6\u95f4\u662f 50ms\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u7406\u89e3\u7684\u65b9\u5411\u662f\u5bf9\u7684\uff1a<strong>DNS \u67e5\u8be2\u4e0d\u7b49\u540c\u4e8e\u4f20\u7edf\u610f\u4e49\u4e0a\u7684 TCP \u4e09\u6b21\u63e1\u624b\u8fde\u63a5<\/strong>\u3002408\/\u7edf\u8003\u8fd9\u7c7b\u9898\u91cc\uff0c\u9664\u975e\u9898\u76ee\u7279\u522b\u8bf4\u660e DNS \u4f7f\u7528 TCP\uff0c\u5426\u5219\u666e\u901a DNS \u67e5\u8be2\u9ed8\u8ba4\u6309 UDP \u67e5\u8be2\/\u54cd\u5e94\u5904\u7406\uff0c\u53ea\u8ba1\u7b97 DNS \u67e5\u8be2\u7684 RTT\uff0c\u4e0d\u989d\u5916\u8ba1\u7b97 TCP \u5efa\u7acb\u8fde\u63a5\u65f6\u95f4\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u7c7b\u9898\u6700\u5bb9\u6613\u9519\u5728\u4e24\u70b9\uff1a\u7b2c\u4e00\uff0c\u628a DNS \u67e5\u8be2\u4e5f\u5f53\u6210 TCP \u8fde\u63a5\uff0c\u9519\u8bef\u5730\u7ed9\u6bcf\u4e2a DNS \u670d\u52a1\u5668\u90fd\u52a0\u4e09\u6b21\u63e1\u624b\u65f6\u95f4\uff1b\u7b2c\u4e8c\uff0c\u53ea\u7b97 TCP \u4e09\u6b21\u63e1\u624b\uff0c\u4e0d\u7b97 HTTP \u8bf7\u6c42\u5230\u54cd\u5e94\u7684\u90a3 1 \u4e2a RTT\u3002\u8bb0\u6cd5\u53ef\u4ee5\u76f4\u63a5\u538b\u7f29\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u603b\u65f6\u95f4 = DNS \u89e3\u6790 RTT \u6570 + TCP \u5efa\u7acb\u8fde\u63a5 1RTT + HTTP \u8bf7\u6c42\u54cd\u5e94 1RTT\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u672c\u9898\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6700\u77ed\uff1a0 + 1RTT + 1RTT = 20ms\n\u6700\u957f\uff1a3RTT + 1RTT + 1RTT = 50ms\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u4e09\u9898\u7b54\u6848\u5206\u522b\u662f\uff1a \u7b2c 10 \u9898\uff1aB\uff0c1 \u6761\uff0c\u591a\u6761\u7b2c 11 \u9898\uff1aA\uff0c1 \u6761\uff0c1 \u6761\u7b2c 12 \u9898\uff1aC\uff0c0 \u6761\uff0c4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2268","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2268","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2268"}],"version-history":[{"count":1,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2268\/revisions"}],"predecessor-version":[{"id":2274,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2268\/revisions\/2274"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2268"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2268"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2268"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}