Apex domains cannot have CNAME records.
Question and response
Question
dig educatio.hu. NS
Answer
educatio.hu. 5 NS ns1.educatio.hu.
educatio.hu. 5 NS ns2.educatio.hu.
Authority
The response has no authority records.
Additional
ns1.educatio.hu. 5 A 193.6.241.251
ns2.educatio.hu. 5 A 193.225.215.150
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0