Apex domains cannot have CNAME records.
Question and response
Question
dig up2university.eu. NS
Answer
up2university.eu. 4 NS ns03.geant.net.
up2university.eu. 4 NS ns02.geant.net.
up2university.eu. 4 NS ns01.geant.net.
Authority
The response has no authority records.
Additional
ns01.geant.net. 4 A 62.40.104.250
ns02.geant.net. 4 A 62.40.116.114
ns03.geant.net. 4 A 62.40.116.122
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0