Apex domains cannot have CNAME records.
Question and response
Question
dig uees.edu.ec. NS
Answer
uees.edu.ec. 4 NS dns.uees.edu.ec.
uees.edu.ec. 4 NS dns2.uees.edu.ec.
Authority
The response has no authority records.
Additional
dns.uees.edu.ec. 4 A 200.1.161.59
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0