Apex domains cannot have CNAME records.
Question and response
Question
dig virtualns.net. NS
Answer
virtualns.net. 5 NS ns2.neodigit.net.
virtualns.net. 5 NS ns1.neodigit.net.
Authority
The response has no authority records.
Additional
ns1.neodigit.net. 5 A 31.47.72.140
ns2.neodigit.net. 5 A 31.47.72.150
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0