Apex domains cannot have CNAME records.
Question and response
Question
dig dnsresolve.net. NS
Answer
dnsresolve.net. 5 NS ns1.dnsresolve.net.
dnsresolve.net. 5 NS ns2.dnsresolve.net.
Authority
The response has no authority records.
Additional
ns1.dnsresolve.net. 5 A 193.254.184.231
ns2.dnsresolve.net. 5 A 193.254.185.231
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0