Apex domains cannot have CNAME records.
Question and response
Question
dig etapanet.net. NS
Answer
etapanet.net. 4 NS dns2.etapa.net.ec.
etapanet.net. 4 NS dns1.etapa.net.ec.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0