Apex domains cannot have CNAME records.
Question and response
Question
dig cgocable.com. NS
Answer
cgocable.com. 4 NS ns3.cgocable.ca.
cgocable.com. 4 NS ns4.cgocable.ca.
cgocable.com. 4 NS ns1.cgocable.net.
cgocable.com. 4 NS ns2.cgocable.net.
Authority
The response has no authority records.
Additional
ns2.cgocable.net. 4 A 24.226.1.42
ns3.cgocable.ca. 4 A 24.226.157.82
ns4.cgocable.ca. 4 A 24.226.157.94
ns2.cgocable.net. 4 AAAA 2001:1970:c06e:c0:0:0:0:46
ns3.cgocable.ca. 4 AAAA 2001:18c0:ffe0:1a:0:0:0:2
ns4.cgocable.ca. 4 AAAA 2001:18c0:ffe0:1b:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0