We pick d.root-servers.net, one of the 13 root servers (1), and ask it about cc.cu and learn that cu is delegated to six name servers (2), so we ask ns.dns.br where we learn that cc.cu is delegated to two name servers, including ns1.etecsa.net.cu (3), so we ask that one and get the following answer:
All of the one domains that only use the name server ns1.cc.cu use only the mail server ns1.cc.cu. Worth noting is that one of the domains that only use the mail server ns1.cc.cu use only the name server ns1.cc.cu.
The IP number 200.55.139.82
All of the one host names that point to the IP number 200.55.139.82 point only to that ip number.
The mail server ns1.cc.cu only
One of the two domains that only use the mail server ns1.cc.cu use only the name server ns1.cc.cu. Worth noting is that all of the domains that only use the name server ns1.cc.cu use only the mail server ns1.cc.cu.
