Apex domains cannot have CNAME records.
Question and response
Question
dig ns2.wnetserver.com. NS
Answer
ns2.wnetserver.com. 1 NS ns2.wnetserver.com.
ns2.wnetserver.com. 1 NS ns1.wnetserver.com.
Authority
The response has no authority records.
Additional
ns1.wnetserver.com. 1 A 192.142.2.20
ns2.wnetserver.com. 1 A 192.142.2.20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0