Apex domains cannot have CNAME records.
Question and response
Question
dig ecnet.ec. NS
Answer
ecnet.ec. 5 NS ecnet.ec.
ecnet.ec. 5 NS ecua.net.ec.
Authority
The response has no authority records.
Additional
ecua.net.ec. 5 A 157.100.1.2
ecnet.ec. 5 A 157.100.1.4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0