Apex domains cannot have CNAME records.
Question and response
Question
dig vbu.rdsnet.ro. NS
Answer
vbu.rdsnet.ro. 5 NS ns1.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc1vm.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc2new.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS bupa-dc3.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc2vm.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS bufo-dc1.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc4new.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc1new.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS dc3new.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS bhda-dc2.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS intra-vbu-bk.vbu.rdsnet.ro.
vbu.rdsnet.ro. 5 NS intra-vbu-dc2.vbu.rdsnet.ro.
Authority
The response has no authority records.
Additional
ns1.rdsnet.ro. 5 A 193.231.236.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0