Apex domains cannot have CNAME records.
Question and response
Question
dig comnet-telecom.com. NS
Answer
comnet-telecom.com. 5 NS ns2.comnet-telecom.com.
comnet-telecom.com. 5 NS ns4.comnet-telecom.com.
comnet-telecom.com. 5 NS ns1.comnet-telecom.com.
comnet-telecom.com. 5 NS ns3.comnet-telecom.com.
Authority
The response has no authority records.
Additional
ns1.comnet-telecom.com. 5 A 202.68.194.225
ns2.comnet-telecom.com. 5 A 202.68.194.226
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0