Apex domains cannot have CNAME records.
Question and response
Question
dig top-consulting.net. NS
Answer
top-consulting.net. 4 NS ns3.top-consulting.net.
top-consulting.net. 4 NS ns4.top-consulting.net.
Authority
The response has no authority records.
Additional
ns3.top-consulting.net. 4 A 69.28.212.201
ns4.top-consulting.net. 4 A 65.39.216.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0