Apex domains cannot have CNAME records.
Question and response
Question
dig trans-telco.net. NS
Answer
trans-telco.net. 4 NS ns1.telconet.net.
trans-telco.net. 4 NS ns3.telconet.net.
trans-telco.net. 4 NS ns2.telconet.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0