Apex domains cannot have CNAME records.
Question and response
Question
dig ruffnet.hu. NS
Answer
ruffnet.hu. 5 NS ns2.ruffnet.hu.
ruffnet.hu. 5 NS ns1.ruffnet.hu.
Authority
The response has no authority records.
Additional
ns1.ruffnet.hu. 5 A 162.55.180.65
ns2.ruffnet.hu. 5 A 116.202.104.74
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0