Apex domains cannot have CNAME records.
Question and response
Question
dig net.ec. NS
Answer
net.ec. 3 NS n3.dns.ec.
net.ec. 3 NS ns1.anycastdns.cz.
net.ec. 3 NS ns2.anycastdns.cz.
net.ec. 3 NS n2.nic.ec.
net.ec. 3 NS a.lactld.org.
Authority
The response has no authority records.
Additional
a.lactld.org. 2 A 200.0.68.10
n2.nic.ec. 161717 A 200.12.199.1
n3.dns.ec. 164576 A 204.61.216.39
a.lactld.org. 2 AAAA 2801:14:a000:0:0:0:0:10
n2.nic.ec. 161717 AAAA 2801:0:60:0:0:0:0:1
n3.dns.ec. 164576 AAAA 2001:500:14:6039:ad:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0