Apex domains cannot have CNAME records.
Question and response
Question
dig deac.net. NS
Answer
deac.net. 4 NS ns3.deac.lv.
deac.net. 4 NS ns1.deac.lv.
deac.net. 4 NS ns2.deac.lv.
Authority
The response has no authority records.
Additional
ns1.deac.lv. 4 A 194.9.175.2
ns2.deac.lv. 4 A 194.19.240.232
ns3.deac.lv. 4 A 20.61.59.136
ns1.deac.lv. 4 AAAA 2a00:17c0:dc01:deac:0:0:0:53
ns2.deac.lv. 4 AAAA 2a02:16d8:2:9:0:0:0:53
ns3.deac.lv. 4 AAAA 2603:1020:200:0:0:0:682f:a26c
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0