请求dns域名解析商是不是直接和全球根服务器联系的

ref: DNS 查询的工作原理自己动手(on *nix)观察DNS请求的递归查询过程:dig +trace -t A @8.8.8.8 taobao.com; \u0026lt;\u0026lt;\u0026gt;\u0026gt; DiG 9.7.0-P1 \u0026lt;\u0026lt;\u0026gt;\u0026gt; +trace -t A @8.8.8.8 taobao.com; (1 server found);; global options: +cmd.\t\t\t13024\tIN\tNS\tg.root-servers.net..\t\t\t13024\tIN\tNS\tl.root-servers.net..\t\t\t13024\tIN\tNS\th.root-servers.net..\t\t\t13024\tIN\tNS\tb.root-servers.net..\t\t\t13024\tIN\tNS\td.root-servers.net..\t\t\t13024\tIN\tNS\tk.root-servers.net..\t\t\t13024\tIN\tNS\tc.root-servers.net..\t\t\t13024\tIN\tNS\tm.root-servers.net..\t\t\t13024\tIN\tNS\tj.root-servers.net..\t\t\t13024\tIN\tNS\ti.root-servers.net..\t\t\t13024\tIN\tNS\ta.root-servers.net..\t\t\t13024\tIN\tNS\tf.root-servers.net..\t\t\t13024\tIN\tNS\te.root-servers.net.;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 212 mscom.\t\t\t172800\tIN\tNS\ta.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tb.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tc.gtld-servers.net.com.\t\t\t172800\tIN\tNS\td.gtld-servers.net.com.\t\t\t172800\tIN\tNS\te.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tf.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tg.gtld-servers.net.com.\t\t\t172800\tIN\tNS\th.gtld-servers.net.com.\t\t\t172800\tIN\tNS\ti.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tj.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tk.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tl.gtld-servers.net.com.\t\t\t172800\tIN\tNS\tm.gtld-servers.net.;; Received 488 bytes from 2001:500:1::803f:235#53(h.root-servers.net) in 236 mstaobao.com.\t\t172800\tIN\tNS\tns4.taobao.com.taobao.com.\t\t172800\tIN\tNS\tns5.taobao.com.taobao.com.\t\t172800\tIN\tNS\tns6.taobao.com.taobao.com.\t\t172800\tIN\tNS\tns7.taobao.com.;; Received 180 bytes from 192.42.93.30#53(g.gtld-servers.net) in 275 mstaobao.com.\t\t600\tIN\tA\t110.75.115.70taobao.com.\t\t10800\tIN\tNS\tns7.taobao.com.taobao.com.\t\t10800\tIN\tNS\tns4.taobao.com.taobao.com.\t\t10800\tIN\tNS\tns5.taobao.com.taobao.com.\t\t10800\tIN\tNS\tns6.taobao.com.;; Received 196 bytes from 110.75.20.29#53(ns6.taobao.com) in 36 ms


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