DNS简介

{"value":"## DNS\u7b80\u4ecb\n\nDNS\uff08Domain Name System\uff09\u662f\u56e0\u7279\u7f51\u7684\u4e00\u9879\u670d\u52a1\u3002\u5b83\u4f5c\u4e3a\u4e00\u79cd\u5206\u5e03\u5f0f\u6570\u636e\u5e93\uff0c\u5141\u8bb8\u7528\u6237\u901a\u8fc7\u65b9\u4fbf\u8bb0\u5fc6\u7684\u57df\u540d\uff08\u5982example.com\uff09\u6765\u8bbf\u95ee\u4e92\u8054\u7f51\u4e0a\u7684\u8d44\u6e90\uff0c\u800c\u4e0d\u662f\u96be\u4ee5\u8bb0\u5fc6\u7684IP\u5730\u5740\uff08\u5982192.0.2.1\uff09\u3002\u5176\u4e3b\u8981\u529f\u80fd\u662f\u5c06\u57df\u540d\u548cIP\u5730\u5740\u76f8\u4e92\u6620\u5c04\uff0c\u8fd9\u6837\u5f53\u7528\u6237\u5728\u6d4f\u89c8\u5668\u6216\u5e94\u7528\u4e2d\u8f93\u5165\u4e00\u4e2a\u57df\u540d\u65f6\uff0cDNS\u670d\u52a1\u5c31\u53ef\u4ee5\u6307\u5bfc\u8bf7\u6c42\u5230\u8fbe\u6b63\u786e\u7684\u670d\u52a1\u5668\u3002\n\n## DNS\u6709\u54ea\u4e9b\u4f7f\u7528\u573a\u666f\uff1f\n\n*** *\u7f51\u9875\u8bbf\u95ee **--\u7528\u6237\u5728\u6d4f\u89c8\u5668\u5730\u5740\u680f\u8f93\u5165\u7f51\u5740\u65f6\uff0cDNS\u670d\u52a1\u8d1f\u8d23\u5c06\u57df\u540d\u89e3\u6790\u4e3a\u5bf9\u5e94\u7684IP\u5730\u5740\uff0c\u4f7f\u5f97\u6d4f\u89c8\u5668\u53ef\u4ee5\u52a0\u8f7d\u7528\u6237\u8bf7\u6c42\u7684\u7f51\u9875\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u8f93\u5165\u201cwww.example.com\u201d\u65f6\uff0cDNS\u89e3\u6790\u8be5\u57df\u540d\u4e3a\u5206\u914d\u7ed9\u8be5\u57df\u7684\u7279\u5b9aIP\u5730\u5740\uff0c\u4ee5\u4fbf\u6d4f\u89c8\u5668\u53ef\u4ee5\u8fde\u63a5\u5230\u6258\u7ba1\u76f8\u5e94\u7f51\u7ad9\u7684\u670d\u52a1\u5668\u3002\n\n*** *\u7535\u5b50\u90ae\u4ef6\u670d\u52a1 **--\u53d1\u9001\u548c\u63a5\u6536\u7535\u5b50\u90ae\u4ef6\u65f6\uff0cDNS\u5e2e\u52a9\u90ae\u4ef6\u670d\u52a1\u5668\u5c06\u90ae\u4ef6\u53d1\u9001\u5230\u6b63\u786e\u7684\u63a5\u6536\u670d\u52a1\u5668\u3002\u4f8b\u5982\uff0c\u5f53\u7528\u6237\u53d1\u9001\u90ae\u4ef6\u5230\"[email protected]\"\uff0cDNS\u89e3\u6790\u51fa\u5bf9\u5e94\u7684\u90ae\u4ef6\u670d\u52a1\u5668IP\u5730\u5740\uff0c\u786e\u4fdd\u90ae\u4ef6\u80fd\u6b63\u786e\u6295\u9012example.com\u7684\u90ae\u7bb1\u4e2d\u3002\n\n*** *\u7f51\u7edc\u5b89\u5168\u4e0e\u8fc7\u6ee4 **--DNS\u53ef\u4ee5\u88ab\u7528\u4f5c\u7f51\u7edc\u5b89\u5168\u7b56\u7565\u7684\u4e00\u90e8\u5206\uff0c\u901a\u8fc7\u62e6\u622a\u6076\u610f\u57df\u540d\u6765\u9632\u6b62\u7528\u6237\u8bbf\u95ee\u4e0d\u5b89\u5168\u7684\u7f51\u7ad9\u3002\u4f8b\u5982\uff0c\u67d0\u4f01\u4e1a\u53ef\u80fd\u901a\u8fc7DNS\u5c06\u5df2\u77e5\u7684\u9493\u9c7c\u7f51\u7ad9\u57df\u540d\u62e6\u622a\uff0c\u907f\u514d\u5458\u5de5\u8bbf\u95ee\u5e76\u6cc4\u9732\u654f\u611f\u4fe1\u606f\u3002\n\n*** *\u591a\u5730\u57df\u90e8\u7f72 **--\u5bf9\u4e8e\u8de8\u56fd\u516c\u53f8\u548c\u670d\u52a1\uff0cDNS\u6709\u52a9\u4e8e\u6307\u5f15\u7528\u6237\u5230\u6700\u8fd1\u7684\u670d\u52a1\u5668\u533a\u57df\uff0c\u7f29\u77ed\u54cd\u5e94\u65f6\u95f4\u548c\u63d0\u9ad8\u670d\u52a1\u8d28\u91cf\u3002\u4f8b\u5982\uff0c\u4e00\u4e2a\u56fd\u9645\u7535\u5546\u5e73\u53f0\u53ef\u4ee5\u6839\u636e\u7528\u6237\u7684\u5730\u7406\u4f4d\u7f6e\uff0c\u901a\u8fc7DNS\u89e3\u6790\u6307\u5411\u4e9a\u6d32\u3001\u7f8e\u6d32\u6216\u6b27\u6d32\u7684\u6570\u636e\u4e2d\u5fc3\u3002\n\n## DNS\u670d\u52a1\u6709\u54ea\u4e9b\u7c7b\u578b\uff1f\n\nDNS\u670d\u52a1\u7684\u7c7b\u578b\u901a\u5e38\u6307\u7684\u662f\u63d0\u4f9bDNS\u89e3\u6790\u670d\u52a1\u7684\u51e0\u79cd\u57fa\u672c\u65b9\u5f0f\u3002\u4ee5\u4e0b\u4e24\u79cd\u662f\u6700\u4e3b\u8981\u7684DNS\u670d\u52a1\u7c7b\u578b\uff1a\n\n*** *\u6743\u5a01DNS\u670d\u52a1\uff08Authoritative DNS Service\uff09**\n\n\u6743\u5a01DNS\u670d\u52a1\u662f\u4e00\u79cd\u63d0\u4f9b\u5173\u4e8e\u57df\u540d\u53ca\u5176\u76f8\u5173\u8bb0\u5f55\uff08\u5982A\u8bb0\u5f55\u3001MX\u8bb0\u5f55\u3001CNAME\u8bb0\u5f55\u7b49\uff09\u6743\u5a01\u4fe1\u606f\u7684\u670d\u52a1\u3002\u5b83\u54cd\u5e94\u5916\u754c\u5bf9\u4e8e\u7279\u5b9a\u57df\u540d\u7684\u89e3\u6790\u8bf7\u6c42\uff0c\u5e76\u5bf9\u57df\u540d\u4e0b\u7684\u6240\u6709\u8bb0\u5f55\u8fdb\u884c\u7ba1\u7406\u3002\u8fd9\u79cd\u670d\u52a1\u901a\u5e38\u7531\u62e5\u6709\u57df\u540d\u7684\u7ec4\u7ec7\u6216\u5176\u6258\u7ba1\u670d\u52a1\u63d0\u4f9b\u5546\u6765\u7ef4\u62a4\u3002\u5f53\u8bf7\u6c42\u5230\u8fbe\u6743\u5a01DNS\u670d\u52a1\u5668\u65f6\uff0c\u670d\u52a1\u5668\u4f1a\u8fd4\u56de\u5b58\u50a8\u5728\u5176\u6570\u636e\u5e93\u4e2d\u7684\u6b63\u786e\u8bb0\u5f55\u3002\n\n\u6258\u7ba1DNS\u670d\u52a1\u662f\u7531\u4e13\u4e1a\u7684DNS\u670d\u52a1\u63d0\u4f9b\u5546\u63d0\u4f9b\u7684\u6743\u5a01DNS\u89e3\u6790\u670d\u52a1\u3002\u8fd9\u4e9b\u670d\u52a1\u901a\u5e38\u4ee5\u8ba2\u9605\u7684\u5f62\u5f0f\u6765\u8fd0\u8425\uff0c\u63d0\u4f9b\u9ad8\u6027\u80fd\u3001\u9ad8\u53ef\u7528\u6027\u548c\u9644\u52a0\u5b89\u5168\u63aa\u65bd\uff0c\u5982DDoS\u653b\u51fb\u9632\u62a4\u3002\u6258\u7ba1DNS\u670d\u52a1\u975e\u5e38\u9002\u5408\u90a3\u4e9b\u9700\u8981\u7a33\u5b9a\u3001\u53ef\u9760DNS\u89e3\u6790\u7684\u4f01\u4e1a\uff0c\u4f46\u4e0d\u60f3\u6295\u5165\u8d44\u6e90\u6765\u81ea\u5df1\u7ef4\u62a4DNS\u57fa\u7840\u8bbe\u65bd\u3002\n\n*** *\u9012\u5f52DNS\u670d\u52a1\uff08Recursive DNS Service\uff09**\n\n\u9012\u5f52DNS\u670d\u52a1\u4e3a\u7528\u6237\u63d0\u4f9b\u4e86\u67e5\u8be2\u4efb\u610f\u57df\u540d\u7684\u80fd\u529b\u3002\u5f53\u5ba2\u6237\u7aef\u53d1\u8d77DNS\u67e5\u8be2\u8bf7\u6c42\u65f6\uff0c\u9012\u5f52DNS\u670d\u52a1\u5668\u5c06\u4ee3\u8868\u7528\u6237\u6267\u884c\u6574\u4e2a\u89e3\u6790\u8fc7\u7a0b\uff0c\u4ece\u6839\u670d\u52a1\u5668\u5230TLD\uff08\u9876\u7ea7\u57df\u540d\uff09\u670d\u52a1\u5668\uff0c\u4e00\u76f4\u5230\u6743\u5a01DNS\u670d\u52a1\u5668\uff0c\u6700\u540e\u5c06\u89e3\u6790\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u8fd9\u79cd\u670d\u52a1\u7684\u7279\u70b9\u662f\u4e3a\u7528\u6237\u9690\u85cf\u4e86\u89e3\u6790\u7684\u590d\u6742\u6027\uff0c\u63d0\u4f9b\u4e86\u65b9\u4fbf\u7684\u4e00\u7ad9\u5f0f\u89e3\u6790\u670d\u52a1\u3002 \u516c\u5171DNS\u670d\u52a1\u7279\u6307\u90a3\u4e9b\u7531\u7b2c\u4e09\u65b9\u7ec4\u7ec7\u8fd0\u8425\u5e76\u5411\u5927\u4f17\u63d0\u4f9b\u7684\u9012\u5f52DNS\u670d\u52a1\u3002\u8fd9\u4e9b\u670d\u52a1\u5f80\u5f80\u5f3a\u8c03\u63d0\u4f9b\u66f4\u5feb\u901f\u3001\u66f4\u53ef\u9760\u3001\u66f4\u5b89\u5168\u7684DNS\u89e3\u6790\u4f53\u9a8c\u3002\u4f8b\u5982\uff0c\u963f\u91cc\u4e91\u516c\u5171DNS\u63d0\u4f9b\u6bcf\u67081000\u4e07\u6b21\u514d\u8d39HTTPDNS\u89e3\u6790\u670d\u52a1\u5e76\u627f\u8bfa\u589e\u5f3a\u7528\u6237\u9690\u79c1\u4fdd\u62a4\u3002\n\n\u8fd9\u4e9bDNS\u670d\u52a1\u7c7b\u578b\u5404\u81ea\u6ee1\u8db3\u4e86\u4e0d\u540c\u7684\u9700\u6c42\uff0c\u4ece\u4f01\u4e1a\u7ea7\u7684\u7a33\u5b9a\u6027\u548c\u5b89\u5168\u6027\u8981\u6c42\u5230\u666e\u901a\u7528\u6237\u7684\u65b9\u4fbf\u6027\u548c\u53ef\u63a5\u53d7\u6027\u3002\u9009\u62e9\u5408\u9002\u7684DNS\u670d\u52a1\u7c7b\u578b\u53ef\u4ee5\u5e2e\u52a9\u4fdd\u969c\u7f51\u7edc\u8fde\u63a5\u7684\u7a33\u5b9a\u6027\u548c\u89e3\u6790\u901f\u5ea6\uff0c\u540c\u65f6\u5bf9\u4e8e\u5927\u578b\u7f51\u7ad9\u6216\u670d\u52a1\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7\u6539\u5584DNS\u89e3\u6790\u6548\u7387\u6765\u63d0\u5347\u6700\u7ec8\u7528\u6237\u7684\u4f53\u9a8c\u3002\n\n"}