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31、DNS介绍


[root@centos6 ~]# dig @8.8.8.8 www.baidu.com +trace

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.37.rc1.el6 <<>> @8.8.8.8 www.baidu.com +trace

; (1 server found)

;; global options: +cmd

. 194151 IN NS e.root-servers.net.

. 194151 IN NS a.root-servers.net.

. 194151 IN NS g.root-servers.net.

. 194151 IN NS h.root-servers.net.

. 194151 IN NS b.root-servers.net.

. 194151 IN NS l.root-servers.net.

. 194151 IN NS i.root-servers.net.

. 194151 IN NS d.root-servers.net.

. 194151 IN NS k.root-servers.net.

. 194151 IN NS f.root-servers.net.

. 194151 IN NS j.root-servers.net.

. 194151 IN NS c.root-servers.net.

. 194151 IN NS m.root-servers.net.

;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 277 ms


com. 172800 IN NS a.gtld-servers.net.

com. 172800 IN NS b.gtld-servers.net.

com. 172800 IN NS c.gtld-servers.net.

com. 172800 IN NS d.gtld-servers.net.

com. 172800 IN NS e.gtld-servers.net.

com. 172800 IN NS f.gtld-servers.net.

com. 172800 IN NS g.gtld-servers.net.

com. 172800 IN NS h.gtld-servers.net.

com. 172800 IN NS i.gtld-servers.net.

com. 172800 IN NS j.gtld-servers.net.

com. 172800 IN NS k.gtld-servers.net.

com. 172800 IN NS l.gtld-servers.net.

com. 172800 IN NS m.gtld-servers.net.

;; Received 491 bytes from 199.7.91.13#53(199.7.91.13) in 537 ms


baidu.com. 172800 IN NS dns.baidu.com.

baidu.com. 172800 IN NS ns2.baidu.com.

baidu.com. 172800 IN NS ns3.baidu.com.

baidu.com. 172800 IN NS ns4.baidu.com.

baidu.com. 172800 IN NS ns7.baidu.com.

;; Received 201 bytes from 192.42.93.30#53(192.42.93.30) in 320 ms


www.baidu.com. 1200 IN CNAME www.a.shifen.com.

a.shifen.com. 1200 IN NS ns2.a.shifen.com.

a.shifen.com. 1200 IN NS ns1.a.shifen.com.

a.shifen.com. 1200 IN NS ns3.a.shifen.com.

a.shifen.com. 1200 IN NS ns5.a.shifen.com.

a.shifen.com. 1200 IN NS ns4.a.shifen.com.

;; Received 228 bytes from 220.181.37.10#53(220.181.37.10) in 36 ms

31.1、端口知识：

posted @ 2020-02-15 20:43  云起时。  阅读(106)  评论(0)  编辑  收藏  举报