Apex domains cannot have CNAME records.
Question and response
Question
dig Fonnet.RO. NS
Answer
fonnet.ro. 1 NS dns1.s-net.ro.
fonnet.ro. 1 NS ns1.s-net.ro.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0