Apex domains cannot have CNAME records.
Question and response
Question
dig mediasat.ro. NS
Answer
mediasat.ro. 5 NS bombur.mediasat.ro.
mediasat.ro. 5 NS thorin.mediasat.ro.
Authority
The response has no authority records.
Additional
bombur.mediasat.ro. 5 A 193.231.169.3
thorin.mediasat.ro. 5 A 193.231.169.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0