Apex domains cannot have CNAME records.
Question and response
Question
dig vcsk.hu. NS
Answer
vcsk.hu. 5 NS ns2.iif.hu.
vcsk.hu. 5 NS ns.vcsk.hu.
Authority
The response has no authority records.
Additional
ns.vcsk.hu. 5 A 193.224.140.100
ns2.iif.hu. 5 A 193.225.12.59
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0