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--使用dig工具指定某个DNS域名服务器，对www.cloudcentrics.com,有5台授权DNS服务器 root@kali:~# dig -t ns cloudcentrics.com ; <<>> DiG 9.9.5-9+deb8u2-Debian <<>> -t ns cloudcentrics.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62005 ;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 6 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; MBZ: 0005 , udp: 4096 ;; QUESTION SECTION: ;cloudcentrics.com.             IN      NS ;; ANSWER SECTION: cloudcentrics.com.      5       IN      NS      dns3.name-services.com. cloudcentrics.com.      5       IN      NS      dns4.name-services.com. cloudcentrics.com.      5       IN      NS      dns5.name-services.com. cloudcentrics.com.      5       IN      NS      dns1.name-services.com. cloudcentrics.com.      5       IN      NS      dns2.name-services.com. ;; ADDITIONAL SECTION: dns1.name-services.com. 5       IN      A       98.124.192.1 dns2.name-services.com. 5       IN      A       98.124.197.1 dns3.name-services.com. 5       IN      A       98.124.193.1 dns4.name-services.com. 5       IN      A       98.124.194.1 dns5.name-services.com. 5       IN      A       98.124.196.1 ;; Query time: 215 msec ;; SERVER: 192.168.144.2#53(192.168.144.2) ;; WHEN: Sun Oct 25 16:50:09 EDT 2015 ;; MSG SIZE  rcvd: 235

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