Apex domains cannot have CNAME records.
Question and response
Question
dig acenet.hu. NS
Answer
acenet.hu. 5 NS pdns2.acetelecom.hu.
acenet.hu. 5 NS pdns1.acetelecom.hu.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0