Apex domains cannot have CNAME records.
Question and response
Question
dig ziyonet.uz. NS
Answer
ziyonet.uz. 5 NS ns1.dc.uz.
ziyonet.uz. 5 NS rdns1.dc.uz.
Authority
The response has no authority records.
Additional
ns1.dc.uz. 2 A 91.212.89.4
rdns1.dc.uz. 2 A 91.212.89.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0