; <<>> DiG 9.2.4 <<>> +trace roclinux.cn
;; global options: printcmd
. 335937 IN NS l.root-servers.net.
. 335937 IN NS b.root-servers.net.
. 335937 IN NS d.root-servers.net.
. 335937 IN NS k.root-servers.net.
. 335937 IN NS h.root-servers.net.
. 335937 IN NS j.root-servers.net.
. 335937 IN NS a.root-servers.net.
. 335937 IN NS e.root-servers.net.
. 335937 IN NS c.root-servers.net.
. 335937 IN NS m.root-servers.net.
. 335937 IN NS g.root-servers.net.
. 335937 IN NS i.root-servers.net.
. 335937 IN NS f.root-servers.net.
;; Received 400 bytes from 10.23.0.231#53(10.23.0.231) in 0 ms //从本地DNS查找到根域DNS列表
cn. 172800 IN NS c.dns.cn.
cn. 172800 IN NS a.dns.cn.
cn. 172800 IN NS b.dns.cn.
cn. 172800 IN NS e.dns.cn.
cn. 172800 IN NS ns.cernet.net.
cn. 172800 IN NS d.dns.cn.
;; Received 292 bytes from 192.228.79.201#53(b.root-servers.net) in 460 ms //选择了b.root-servers.net这台根域DNS来查找cn.域DNS列表
roclinux.cn. 21600 IN NS ns11.edong.com.
roclinux.cn. 21600 IN NS ns12.edong.com.
;; Received 76 bytes from 203.119.27.1#53(c.dns.cn) in 0 ms //选择了c.dns.cn这台cn.域DNS服务器来查找roclinux.cn的DNS列表
roclinux.cn. 3600 IN A 116.255.245.206
roclinux.cn. 3600 IN NS ns12.edong.com.
roclinux.cn. 3600 IN NS ns11.edong.com.
;; Received 124 bytes from 61.147.124.145#53(ns11.edong.com) in 104 ms //最终查找到A记录