DNS工作原理

{"value":"## DNS\u7684\u5de5\u4f5c\u539f\u7406\u662f\u4ec0\u4e48\uff1f\n\nDNS\u7684\u5de5\u4f5c\u539f\u7406\u57fa\u4e8e\u4e00\u4e2a\u5206\u5e03\u5f0f\u548c\u5c42\u7ea7\u5316\u7684\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u65e8\u5728\u628a\u7528\u6237\u53ef\u8bfb\u7684\u57df\u540d\u8f6c\u6362\u4e3a\u673a\u5668\u53ef\u8bfb\u7684IP\u5730\u5740\uff0c\u4ece\u800c\u4f7f\u5f97\u8ba1\u7b97\u673a\u548c\u5176\u4ed6\u8bbe\u5907\u80fd\u591f\u8bbf\u95ee\u4e92\u8054\u7f51\u8d44\u6e90\u3002DNS\u67e5\u8be2\u7684\u7ed3\u679c\u901a\u5e38\u4f1a\u5728\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u4e2d\u8fdb\u884c\u7f13\u5b58\uff0c\u5982\u679c\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u4e2d\u6709\u7f13\u5b58\u7684\u60c5\u51b5\u4e0b\uff0c\u5219\u4f1a\u8df3\u8fc7DNS\u67e5\u8be2\u6b65\u9aa4\uff0c\u5f88\u5feb\u8fd4\u56de\u89e3\u6790\u7ed3\u679c\u3002\n\n## \u793a\u4f8b\n\n\u4ee5\u4e0b\u793a\u4f8b\u4e3a\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u6ca1\u6709\u7f13\u5b58\u7684\u60c5\u51b5\u4e0b\uff0cDNS\u67e5\u8be2\u6240\u9700\u76848\u4e2a\u6b65\u9aa4\uff1a\n\n1.\u7528\u6237\u5728Web\u6d4f\u89c8\u5668\u4e2d\u8f93\u5165\u201cexample.com\u201d\uff0c \u7531\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\uff08DNS Resolver\uff09\u5f00\u59cb\u8fdb\u884c\u9012\u5f52\u67e5\u8be2\u3002\n\n2.\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u91c7\u7528\u8fed\u4ee3\u67e5\u8be2\u7684\u65b9\u6cd5\uff0c\u5411\u6839\u57df\u540d\u670d\u52a1\u5668\uff08Root Server\uff09\u8fdb\u884c\u67e5\u8be2\u3002\n\n3.\u6839\u57df\u540d\u670d\u52a1\u5668\u544a\u8bc9\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\uff0c\u4e0b\u4e00\u6b65\u5e94\u8be5\u67e5\u8be2\u7684\u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668.com TLD\u7684IP\u5730\u5740\u3002\n\n4.\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\uff08DNS Resolver\uff09\u5411\u9876\u7ea7\u57df\u540d\u670d\u52a1\u5668.com TLD\uff08TLD Server\uff09\u8fdb\u884c\u67e5\u8be2\u3002\n\n5.com TLD\u670d\u52a1\u5668\u544a\u8bc9\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\uff0c\u4e0b\u4e00\u6b65\u67e5\u8be2example.com\u6743\u5a01\u57df\u540d\u670d\u52a1\u5668\u7684IP\u5730\u5740\u3002\n\n6.\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u5411example.com\u6743\u5a01\u57df\u540d\u670d\u52a1\u5668\uff08example Server\uff09\u53d1\u9001\u67e5\u8be2\u3002\n\n7.example.com\u6743\u5a01\u57df\u540d\u670d\u52a1\u5668\u544a\u8bc9\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u6240\u67e5\u8be2\u7684\u4e3b\u673aIP\u5730\u5740\u3002\n\n8.\u672c\u5730\u57df\u540d\u670d\u52a1\u5668\u6700\u540e\u628a\u67e5\u8be2\u7684IP\u5730\u5740\u54cd\u5e94\u7ed9Web\u6d4f\u89c8\u5668\u3002\n\n\u4e00\u65e6DNS\u67e5\u8be2\u76848\u4e2a\u6b65\u9aa4\u8fd4\u56de\u4e86example.com\u7684IP\u5730\u5740\uff0c\u6d4f\u89c8\u5668\u5c31\u80fd\u591f\u53d1\u51fa\u5bf9\u7f51\u9875\u7684\u8bf7\u6c42\uff1a\n\n\u6d4f\u89c8\u5668\u5411IP\u5730\u5740\u53d1\u51faHTTP\u8bf7\u6c42\u3002\n\n\u8be5IP\u7684Web\u670d\u52a1\u5668\u8fd4\u56de\u8981\u5728\u6d4f\u89c8\u5668\u4e2d\u5448\u73b0\u7684\u7f51\u9875\u3002\n\n"}