DNS protocol analysis

The first 1 Turn off ：nslookup Domain name resolution

Our mission ： Use nslookup Realization IP Address and domain name conversion and resolution .

 Query domain name www.educoder.net Of DNS The server IP：172.21.0.10
 domain name www.educoder.net Of IP：121.40.10.136
 Query domain name www.educoder.net In the name service result origin value ：ns.dns.cluster.local
172.21.0.10 Corresponding domain name ：kube