Apex domains cannot have CNAME records.
Question and response
Question
dig cygnal.ca. NS
Answer
cygnal.ca. 3 NS ns2.cygnal.ca.
cygnal.ca. 3 NS ns.cygnal.ca.
Authority
The response has no authority records.
Additional
ns.cygnal.ca. 3 A 24.244.219.144
ns2.cygnal.ca. 3 A 24.244.192.98
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0