{"id":476883,"date":"2023-08-09T09:05:02","date_gmt":"2023-08-09T09:05:02","guid":{"rendered":""},"modified":"2023-09-05T11:13:37","modified_gmt":"2023-09-05T11:13:37","slug":"dns-cache","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/cn\/wiki\/dns-cache\/","title":{"rendered":"DNS\u7f13\u5b58"},"content":{"rendered":"<p>DNS \u7f13\u5b58\u662f\u57df\u540d\u7cfb\u7edf\u7f13\u5b58\u7684\u7f29\u5199\uff0c\u662f\u4e92\u8054\u7f51\u57fa\u7840\u8bbe\u65bd\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\u3002\u5b83\u5728\u52a0\u901f\u5c06\u57df\u540d\u8f6c\u6362\u4e3a IP \u5730\u5740\u7684\u8fc7\u7a0b\u4e2d\u53d1\u6325\u7740\u81f3\u5173\u91cd\u8981\u7684\u4f5c\u7528\uff0c\u4f7f\u7f51\u9875\u6d4f\u89c8\u66f4\u52a0\u9ad8\u6548\u548c\u65e0\u7f1d\u3002 DNS\u7f13\u5b58\u5b58\u50a8\u4ee5\u524d\u89e3\u6790\u7684\u57df\u540d\u8bb0\u5f55\uff0c\u5141\u8bb8\u5feb\u901f\u68c0\u7d22\u5e76\u51cf\u5c11\u5bf9\u6743\u5a01\u670d\u52a1\u5668\u91cd\u590dDNS\u67e5\u8be2\u7684\u9700\u8981\u3002<\/p>\n<h2>DNS\u7f13\u5b58\u7684\u8d77\u6e90\u548c\u9996\u6b21\u63d0\u53ca\u7684\u5386\u53f2<\/h2>\n<p>DNS \u7f13\u5b58\u7684\u6982\u5ff5\u662f\u5728 1983 \u5e74 Paul Mockapetris \u548c Jon Postel \u5f00\u53d1\u57df\u540d\u7cfb\u7edf\u65f6\u5f15\u5165\u7684\u3002 DNS \u65e8\u5728\u7ba1\u7406\u57df\u540d\u5230 IP \u5730\u5740\u7684\u6620\u5c04\uff0c\u53cd\u4e4b\u4ea6\u7136\uff0c\u4ece\u800c\u4fc3\u8fdb\u4e92\u8054\u7f51\u4e0a\u8ba1\u7b97\u673a\u4e4b\u95f4\u7684\u901a\u4fe1\u3002\u4e3a\u4e86\u63d0\u9ad8\u6548\u7387\uff0cDNS \u7f13\u5b58\u88ab\u5b9e\u73b0\u4e3a\u4e00\u79cd\u51cf\u5c11\u67e5\u8be2\u54cd\u5e94\u65f6\u95f4\u548c\u7f51\u7edc\u8d1f\u8f7d\u7684\u6280\u672f\u3002<\/p>\n<h2>\u6709\u5173 DNS 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\u5468\u671f\u3002\u7f13\u5b58\u67e5\u627e\u8fc7\u7a0b\u6d89\u53ca\u5728\u5411\u6743\u5a01\u670d\u52a1\u5668\u53d1\u9001\u67e5\u8be2\u4e4b\u524d\u641c\u7d22\u672c\u5730\u7f13\u5b58\u3002<\/p>\n<p>DNS\u7f13\u5b58\u7684\u5185\u90e8\u7ed3\u6784\u5305\u62ec\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u7f13\u5b58\u8bb0\u5f55<\/strong>\uff1a\u6bcf\u6761\u7f13\u5b58\u8bb0\u5f55\u5305\u542b\u57df\u540d\u3001\u5bf9\u5e94\u7684IP\u5730\u5740\u3001TTL\u7b49\u5143\u6570\u636e\u3002\u5f53 DNS \u67e5\u8be2\u5f97\u5230\u7b54\u590d\u65f6\uff0c\u89e3\u6790\u5668\u4f1a\u521b\u5efa\u6216\u66f4\u65b0\u7f13\u5b58\u8bb0\u5f55\u3002<\/p>\n<\/li>\n<li>\n<p><strong>TTL\u7ba1\u7406<\/strong>\uff1aTTL \u503c\u6307\u5b9a\u8bb0\u5f55\u5728\u7f13\u5b58\u4e2d\u4fdd\u6301\u6709\u6548\u7684\u65f6\u95f4\u3002 TTL \u8fc7\u671f\u540e\uff0c\u7f13\u5b58\u5c06\u6e05\u9664\u8bb0\u5f55\u4ee5\u786e\u4fdd\u65b0\u7684 DNS \u89e3\u6790\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7f13\u5b58\u8fc7\u671f<\/strong>\uff1a\u9700\u8981\u5b9a\u671f\u68c0\u67e5\u7f13\u5b58\u662f\u5426\u6709\u8fc7\u671f\u8bb0\u5f55\uff0c\u4ee5\u4fdd\u6301\u6570\u636e\u51c6\u786e\u3002\u5fc5\u987b\u4ece\u7f13\u5b58\u4e2d\u5220\u9664\u8fc7\u65f6\u7684\u8bb0\u5f55\uff0c\u4ee5\u9632\u6b62\u63d0\u4f9b\u9519\u8bef\u7684 IP \u5730\u5740\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>DNS\u7f13\u5b58\u7684\u5173\u952e\u7279\u6027\u5206\u6790<\/h2>\n<p>DNS \u7f13\u5b58\u63d0\u4f9b\u4e86\u51e0\u4e2a\u5173\u952e\u529f\u80fd\uff0c\u53ef\u63d0\u9ad8 DNS \u89e3\u6790\u8fc7\u7a0b\u7684\u6548\u7387\u548c\u53ef\u9760\u6027\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u66f4\u5feb\u7684\u54cd\u5e94\u65f6\u95f4<\/strong>\uff1a\u901a\u8fc7\u5b58\u50a8\u5148\u524d\u89e3\u6790\u7684 DNS \u67e5\u8be2\uff0c\u53ef\u4ee5\u4ece\u672c\u5730\u7f13\u5b58\u5feb\u901f\u54cd\u5e94\u540c\u4e00\u57df\u7684\u540e\u7eed\u8bf7\u6c42\uff0c\u4ece\u800c\u51cf\u5c11\u5ef6\u8fdf\u5e76\u6539\u5584\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u51cf\u5c11\u7f51\u7edc\u8d1f\u8f7d<\/strong>\uff1aDNS \u7f13\u5b58\u51cf\u5c11\u4e86\u53d1\u9001\u5230\u6743\u5a01 DNS \u670d\u52a1\u5668\u7684\u67e5\u8be2\u6570\u91cf\uff0c\u6709\u52a9\u4e8e\u5206\u914d DNS \u67e5\u8be2\u8d1f\u8f7d\u5e76\u63d0\u9ad8\u6574\u4f53\u7f51\u7edc\u6027\u80fd\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u63d0\u9ad8\u5f39\u6027<\/strong>\uff1a\u5982\u679c\u6743\u5a01 DNS \u670d\u52a1\u5668\u51fa\u73b0\u6545\u969c\u6216\u65e0\u6cd5\u8bbf\u95ee\uff0c\u7f13\u5b58\u7684 DNS \u8bb0\u5f55\u4ecd\u53ef\u7528\u4e8e\u89e3\u6790\u57df\u540d\uff0c\u786e\u4fdd\u7f51\u7ad9\u6301\u7eed\u53ef\u8bbf\u95ee\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>DNS \u7f13\u5b58\u7684\u7c7b\u578b<\/h2>\n<p>DNS \u7f13\u5b58\u6709\u4e24\u79cd\u4e3b\u8981\u7c7b\u578b\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u5ba2\u6237\u7aef DNS \u7f13\u5b58<\/strong>\uff1a\u6b64\u7f13\u5b58\u5b58\u5728\u4e8e\u5404\u4e2a\u7528\u6237\u8bbe\u5907\uff08\u4f8b\u5982\u8ba1\u7b97\u673a\u3001\u667a\u80fd\u624b\u673a\u3001\u8def\u7531\u5668\uff09\u4e0a\u3002\u5b83\u5b58\u50a8\u7528\u6237\u8bbf\u95ee\u7684\u57df\u7684 DNS \u8bb0\u5f55\uff0c\u4ee5\u4fbf\u66f4\u5feb\u5730\u89e3\u6790\u5bf9\u76f8\u540c\u57df\u7684\u540e\u7eed\u8bbf\u95ee\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u89e3\u6790\u5668\u7aef DNS \u7f13\u5b58<\/strong>\uff1a\u4e5f\u79f0\u4e3a\u9012\u5f52 DNS \u7f13\u5b58\uff0c\u6b64\u7f13\u5b58\u7531 DNS \u89e3\u6790\u5668\uff08\u4f8b\u5982 ISP DNS \u670d\u52a1\u5668\u3001\u516c\u5171 DNS \u670d\u52a1\u5668\uff09\u7ba1\u7406\u3002\u5b83\u5b58\u50a8\u4ece\u6743\u5a01\u670d\u52a1\u5668\u68c0\u7d22\u7684 DNS \u8bb0\u5f55\u5e76\u4e3a\u591a\u4e2a\u7528\u6237\u63d0\u4f9b\u670d\u52a1\uff0c\u4ece\u800c\u51cf\u5c11\u603b\u4f53 DNS \u67e5\u8be2\u6d41\u91cf\u3002<\/p>\n<\/li>\n<\/ol>\n<p>\u6211\u4eec\u7528\u8868\u683c\u603b\u7ed3\u4e00\u4e0b DNS \u7f13\u5b58\u7684\u7c7b\u578b\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u7c7b\u578b<\/th>\n<th>\u5730\u70b9<\/th>\n<th>\u7ba1\u7406<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u5ba2\u6237\u7aef DNS \u7f13\u5b58<\/td>\n<td>\u7528\u6237\u8bbe\u5907<\/td>\n<td>\u7531\u64cd\u4f5c\u7cfb\u7edf\u81ea\u52a8\u7f13\u5b58<\/td>\n<\/tr>\n<tr>\n<td>\u89e3\u6790\u5668\u7aef DNS \u7f13\u5b58<\/td>\n<td>DNS \u89e3\u6790\u5668\uff08\u670d\u52a1\u5668\uff09<\/td>\n<td>DNS\u89e3\u6790\u5668\u8f6f\u4ef6\u81ea\u52a8\u7f13\u5b58<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>DNS\u7f13\u5b58\u7684\u4f7f\u7528\u65b9\u6cd5\u3001\u4f7f\u7528\u8fc7\u7a0b\u4e2d\u9047\u5230\u7684\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6cd5<\/h2>\n<h3>DNS\u7f13\u5b58\u7684\u4f7f\u7528\u65b9\u6cd5\uff1a<\/h3>\n<ol>\n<li>\n<p><strong>\u6d4f\u89c8\u901f\u5ea6\u66f4\u5feb<\/strong>\uff1a\u901a\u8fc7\u5728\u5ba2\u6237\u7aef\u8bbe\u5907\u4e0a\u542f\u7528 DNS \u7f13\u5b58\u6216\u4f7f\u7528\u5177\u6709\u9ad8\u6548\u7f13\u5b58\u7684 DNS \u89e3\u6790\u5668\uff0c\u7528\u6237\u53ef\u4ee5\u4f53\u9a8c\u66f4\u5feb\u7684\u7f51\u9875\u6d4f\u89c8\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7f51\u7edc\u4f18\u5316<\/strong>\uff1aDNS \u7f13\u5b58\u53ef\u51cf\u5c11 DNS \u67e5\u8be2\u91cf\uff0c\u4f18\u5316\u7f51\u7edc\u6027\u80fd\u5e76\u964d\u4f4e\u51fa\u73b0 DNS \u76f8\u5173\u74f6\u9888\u7684\u673a\u4f1a\u3002<\/p>\n<\/li>\n<\/ol>\n<h3>\u95ee\u9898\u53ca\u89e3\u51b3\u65b9\u6848\uff1a<\/h3>\n<ol>\n<li>\n<p><strong>\u8fc7\u65f6\u7684\u7f13\u5b58<\/strong>\uff1a\u7f13\u5b58\u4e2d\u8fc7\u671f\u6216\u4e0d\u6b63\u786e\u7684 DNS \u8bb0\u5f55\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8bbf\u95ee\u7f51\u7ad9\u65f6\u51fa\u73b0\u95ee\u9898\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cDNS \u89e3\u6790\u5668\u901a\u8fc7\u91cd\u65b0\u67e5\u8be2\u6743\u5a01\u670d\u52a1\u5668\u6765\u5b9a\u671f\u5237\u65b0\u5176\u7f13\u5b58\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u7f13\u5b58\u4e2d\u6bd2<\/strong>\uff1a\u5f53\u653b\u51fb\u8005\u64cd\u7eb5\u7f13\u5b58\u4e2d\u7684 DNS \u8bb0\u5f55\u65f6\uff0c\u53ef\u80fd\u4f1a\u53d1\u751f DNS \u7f13\u5b58\u4e2d\u6bd2\uff0c\u5bfc\u81f4\u7528\u6237\u88ab\u91cd\u5b9a\u5411\u5230\u6076\u610f\u7f51\u7ad9\u3002\u5b9e\u65bd DNSSEC\uff08\u57df\u540d\u7cfb\u7edf\u5b89\u5168\u6269\u5c55\uff09\u6709\u52a9\u4e8e\u9632\u6b62\u7f13\u5b58\u4e2d\u6bd2\u653b\u51fb\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5927 TTL \u503c<\/strong>\uff1a\u4e3a DNS \u8bb0\u5f55\u8bbe\u7f6e\u8fc7\u957f\u7684 TTL \u503c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u66f4\u65b0\u5ef6\u8fdf\uff0c\u4ece\u800c\u5728\u670d\u52a1\u5668\u53d1\u751f\u66f4\u6539\u65f6\u96be\u4ee5\u91cd\u5b9a\u5411\u6d41\u91cf\u3002\u4e3a\u4e86\u907f\u514d\u6b64\u95ee\u9898\uff0c\u9700\u8981\u4ed4\u7ec6\u7ba1\u7406 TTL\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>\u4e3b\u8981\u7279\u70b9\u53ca\u4e0e\u540c\u7c7b\u672f\u8bed\u7684\u5176\u4ed6\u6bd4\u8f83<\/h2>\n<table>\n<thead>\n<tr>\n<th>\u5b66\u671f<\/th>\n<th>\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>DNS\u7f13\u5b58<\/td>\n<td>\u4e34\u65f6\u5b58\u50a8 DNS \u67e5\u8be2\u7ed3\u679c\u4ee5\u52a0\u5feb\u89e3\u6790\u901f\u5ea6<\/td>\n<\/tr>\n<tr>\n<td>DNS\u89e3\u6790\u5668<\/td>\n<td>\u8d1f\u8d23\u4ee3\u8868\u5ba2\u6237\u7aef\u67e5\u8be2 DNS \u8bb0\u5f55\u7684\u670d\u52a1\u5668<\/td>\n<\/tr>\n<tr>\n<td>DNS\u8f6c\u53d1\u5668<\/td>\n<td>\u5c06 DNS \u67e5\u8be2\u8f6c\u53d1\u5230\u5176\u4ed6 DNS \u670d\u52a1\u5668\u7684\u670d\u52a1\u5668<\/td>\n<\/tr>\n<tr>\n<td>DNSSEC<\/td>\n<td>\u589e\u52a0 DNS \u534f\u8bae\u5b89\u5168\u6027\u7684\u4e00\u7ec4\u6269\u5c55<\/td>\n<\/tr>\n<tr>\n<td>\u7f13\u5b58\u673a\u5236<\/td>\n<td>\u5b58\u50a8\u7ecf\u5e38\u8bbf\u95ee\u7684\u6570\u636e\u4ee5\u4fbf\u5feb\u901f\u68c0\u7d22\u7684\u8fc7\u7a0b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u4e0e DNS \u7f13\u5b58\u76f8\u5173\u7684\u672a\u6765\u524d\u666f\u548c\u6280\u672f<\/h2>\n<p>DNS \u7f13\u5b58\u7684\u672a\u6765\u4e0e\u7f51\u7edc\u57fa\u7840\u8bbe\u65bd\u548c\u5b89\u5168\u6027\u7684\u8fdb\u6b65\u5bc6\u5207\u76f8\u5173\u3002\u968f\u7740\u4e92\u8054\u7f51\u4f7f\u7528\u91cf\u7684\u6301\u7eed\u589e\u957f\uff0c\u4f18\u5316 DNS \u89e3\u6790\u4ecd\u7136\u81f3\u5173\u91cd\u8981\u3002\u4e00\u4e9b\u6f5c\u5728\u7684\u53d1\u5c55\u5305\u62ec\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u6539\u8fdb\u7684 TTL \u7ba1\u7406<\/strong>\uff1a\u66f4\u667a\u80fd\u7684\u7b97\u6cd5\u53ef\u4ee5\u6839\u636e\u5386\u53f2\u67e5\u8be2\u6a21\u5f0f\u52a8\u6001\u8c03\u6574 TTL \u503c\uff0c\u786e\u4fdd\u6700\u4f73\u7684\u7f13\u5b58\u4fdd\u7559\u5e76\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u9648\u65e7\u6570\u636e\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5206\u5e03\u5f0fDNS\u7f13\u5b58<\/strong>\uff1a\u5b9e\u65bd\u5206\u5e03\u5f0f\u7f13\u5b58\u7cfb\u7edf\u53ef\u4ee5\u8fdb\u4e00\u6b65\u51cf\u5c11\u5404\u4e2a\u89e3\u6790\u5668\u7684\u8d1f\u8f7d\u5e76\u63d0\u4f9b\u5197\u4f59\uff0c\u589e\u5f3aDNS\u7684\u6574\u4f53\u7a33\u5065\u6027\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u4eba\u5de5\u667a\u80fd\u9a71\u52a8\u7684\u7f13\u5b58<\/strong>\uff1a\u4eba\u5de5\u667a\u80fd\u53ef\u7528\u4e8e\u9884\u6d4b\u9891\u7e41\u8bbf\u95ee\u7684\u57df\u5e76\u7f13\u5b58\u76f8\u5173\u8bb0\u5f55\uff0c\u8fdb\u4e00\u6b65\u6539\u5584\u54cd\u5e94\u65f6\u95f4\u548c\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>\u5982\u4f55\u4f7f\u7528\u4ee3\u7406\u670d\u52a1\u5668\u6216\u5c06\u5176\u4e0e DNS \u7f13\u5b58\u5173\u8054<\/h2>\n<p>\u4ee3\u7406\u670d\u52a1\u5668\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u589e\u5f3a DNS \u7f13\u5b58\u7684\u6709\u6548\u6027\uff1a<\/p>\n<ol>\n<li>\n<p><strong>\u7f13\u5b58\u4ee3\u7406<\/strong>\uff1a\u67d0\u4e9b\u4ee3\u7406\u670d\u52a1\u5668\u5728\u672c\u5730\u7f13\u5b58 DNS \u8bb0\u5f55\uff0c\u4ece\u800c\u51cf\u5c11\u7ecf\u5e38\u8bbf\u95ee\u7684\u57df\u7684 DNS \u89e3\u6790\u65f6\u95f4\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5185\u5bb9\u8fc7\u6ee4<\/strong>\uff1a\u5177\u6709 DNS \u8fc7\u6ee4\u529f\u80fd\u7684\u4ee3\u7406\u53ef\u4ee5\u963b\u6b62\u5bf9\u6076\u610f\u57df\u7684\u8bbf\u95ee\uff0c\u4ece\u800c\u63d0\u4f9b\u989d\u5916\u7684\u5b89\u5168\u5c42\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u8d1f\u8f7d\u5747\u8861<\/strong>\uff1a\u4ee3\u7406\u53ef\u4ee5\u8de8\u591a\u4e2a\u89e3\u6790\u5668\u5206\u53d1 DNS \u67e5\u8be2\uff0c\u5e73\u8861\u67e5\u8be2\u8d1f\u8f7d\u5e76\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<\/li>\n<\/ol>\n<h2>\u76f8\u5173\u94fe\u63a5<\/h2>\n<p>\u6709\u5173 DNS \u7f13\u5b58\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u8003\u8651\u63a2\u7d22\u4ee5\u4e0b\u8d44\u6e90\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/www.icann.org\/en\/system\/files\/files\/dns-for-dummies-12dec11-en.pdf\" target=\"_new\" rel=\"noopener nofollow\">\u57df\u540d\u7cfb\u7edf (DNS) \u6982\u8ff0<\/a><\/li>\n<li><a href=\"https:\/\/www.cloudflare.com\/learning\/dns\/dns-cache-poisoning\/\" target=\"_new\" rel=\"noopener nofollow\">DNS \u7f13\u5b58\u4e2d\u6bd2\u89e3\u91ca<\/a><\/li>\n<li><a href=\"https:\/\/www.akamai.com\/us\/en\/resources\/learn-understand\/understanding-dns-caching-and-ttls.jsp\" target=\"_new\" rel=\"noopener nofollow\">\u4e86\u89e3 DNS \u7f13\u5b58\u548c TTL<\/a><\/li>\n<\/ul>","protected":false},"featured_media":476884,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476883","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>DNS Cache: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is DNS cache, and how does it work?","answer":"<p>DNS cache, also known as Domain Name System cache, is a temporary storage location that stores previously resolved domain name records. It works by retaining the results of previous DNS lookups, allowing quick retrieval of IP addresses for domain names without having to contact authoritative DNS servers. This caching mechanism reduces query response time and network load, making web browsing more efficient.<\/p>"},{"question":"Who developed DNS cache, and when was it first introduced?","answer":"<p>The concept of DNS caching was introduced in 1983 by Paul Mockapetris and Jon Postel when they developed the Domain Name System (DNS). The DNS cache was designed to improve the efficiency of DNS resolution, reducing the time required to translate domain names into IP addresses and vice versa.<\/p>"},{"question":"What are the types of DNS cache?","answer":"<p>There are two primary types of DNS cache:<\/p><ol><li><p>Client-Side DNS Cache: This cache exists on individual user devices (e.g., computers, smartphones, routers) and stores DNS records for domains accessed by the user.<\/p><\/li><li><p>Resolver-Side DNS Cache: Also known as Recursive DNS Cache, this cache is managed by DNS resolvers (e.g., ISP DNS servers, public DNS servers) and serves multiple users, reducing overall DNS query traffic.<\/p><\/li><\/ol>"},{"question":"What are the key features of DNS cache?","answer":"<p>DNS cache offers several key features:<\/p><ol><li><p>Faster Response Times: Previously resolved DNS queries are retrieved from the cache, resulting in quicker domain name resolutions.<\/p><\/li><li><p>Reduced Network Load: DNS caching minimizes the number of queries sent to authoritative DNS servers, optimizing network performance.<\/p><\/li><li><p>Improved Resilience: Cached DNS records can still be used to resolve domain names even if authoritative servers experience downtime.<\/p><\/li><\/ol>"},{"question":"What are some problems related to DNS cache usage, and how can they be solved?","answer":"<p>Common issues related to DNS cache usage include:<\/p><ol><li><p>Stale Cache: Expired or incorrect DNS records in the cache can lead to issues accessing websites. The cache can be periodically refreshed by re-querying authoritative servers.<\/p><\/li><li><p>Cache Poisoning: DNS cache poisoning can occur when attackers manipulate DNS records in the cache. Implementing DNSSEC helps prevent such attacks.<\/p><\/li><li><p>Large TTL Values: Setting excessively long TTL values for DNS records can result in delayed updates during server changes. Careful TTL management is necessary to avoid this problem.<\/p><\/li><\/ol>"},{"question":"How can proxy servers be associated with DNS cache?","answer":"<p>Proxy servers can enhance DNS cache efficiency in various ways:<\/p><ol><li><p>Caching Proxies: Some proxy servers cache DNS records locally, reducing DNS resolution time for frequently accessed domains.<\/p><\/li><li><p>Content Filtering: Proxies with DNS filtering capabilities can block access to malicious domains, providing an additional layer of security.<\/p><\/li><li><p>Load Balancing: Proxies can distribute DNS queries across multiple resolvers, balancing the query load and improving performance.<\/p><\/li><\/ol>"},{"question":"What does the future hold for DNS cache technology?","answer":"<p>The future of DNS cache is likely to see advancements in network infrastructure and security. Possible developments may include improved TTL management, distributed DNS cache systems, and AI-driven caching to further enhance DNS resolution efficiency.<\/p>"},{"question":"How can I learn more about DNS cache?","answer":"<p>For more in-depth information about DNS cache, you can explore additional resources such as:<\/p><ul><li><a href=\"https:\/\/www.icann.org\/en\/system\/files\/files\/dns-for-dummies-12dec11-en.pdf\" target=\"_new\">Domain Name System (DNS) Overview<\/a><\/li><li><a href=\"https:\/\/www.cloudflare.com\/learning\/dns\/dns-cache-poisoning\/\" target=\"_new\">DNS Cache Poisoning Explained<\/a><\/li><li><a href=\"https:\/\/www.akamai.com\/us\/en\/resources\/learn-understand\/understanding-dns-caching-and-ttls.jsp\" target=\"_new\">Understanding DNS Caching and TTLs<\/a><\/li><\/ul>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/476883","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/wiki\/476883\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/media\/476884"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/cn\/wp-json\/wp\/v2\/media?parent=476883"}],"curies":[{"name":"\u53ef\u6e7f\u6027\u7c89\u5242","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}