Apex domains cannot have CNAME records.
Question and response
Question
dig atnetwork.ro. NS
Answer
atnetwork.ro. 5 NS ns1.romarg.com.
atnetwork.ro. 5 NS ns2.romarg.com.
atnetwork.ro. 5 NS ns3.romarg.com.
atnetwork.ro. 5 NS ns4.romarg.com.
Authority
The response has no authority records.
Additional
ns1.romarg.com. 5 A 89.42.216.2
ns2.romarg.com. 5 A 86.106.30.242
ns3.romarg.com. 5 A 89.42.216.3
ns4.romarg.com. 5 A 188.209.214.242
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0