Apex domains cannot have CNAME records.
Question and response
Question
dig virtual1.com. NS
Answer
virtual1.com. 5 NS ns3.virtual1.com.
virtual1.com. 5 NS ns4.virtual1.com.
Authority
The response has no authority records.
Additional
ns3.virtual1.com. 5 A 79.98.167.69
ns4.virtual1.com. 5 A 79.98.167.70
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0