Apex domains cannot have CNAME records.
Question and response
Question
dig dnscloud.ca. NS
Answer
dnscloud.ca. 2 NS ns4.dnscloud.ca.
dnscloud.ca. 2 NS ns2.dnscloud.ca.
dnscloud.ca. 2 NS ns1.dnscloud.ca.
dnscloud.ca. 2 NS ns3.dnscloud.ca.
Authority
The response has no authority records.
Additional
ns1.dnscloud.ca. 2 A 69.168.228.101
ns2.dnscloud.ca. 2 A 69.168.229.101
ns3.dnscloud.ca. 2 A 69.168.230.101
ns4.dnscloud.ca. 2 A 69.168.231.101
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0