Apex domains cannot have CNAME records.
Question and response
Question
dig beotel.net. NS
Answer
beotel.net. 4 NS ns.beotel.rs.
beotel.net. 4 NS ns.beotel.net.
Authority
The response has no authority records.
Additional
ns.beotel.net. 4 A 194.106.162.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0