Apex domains cannot have CNAME records.
Question and response
Question
dig telus.net. NS
Answer
telus.net. 4 NS dns24.telus.ca.
telus.net. 4 NS dns24.telus.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0