Apex domains cannot have CNAME records.
Question and response
Question
dig internl.net. NS
Answer
internl.net. 5 NS auth10.dns.internl.net.
internl.net. 5 NS auth20.dns.internl.net.
Authority
The response has no authority records.
Additional
auth10.dns.internl.net. 5 A 77.95.250.4
auth20.dns.internl.net. 5 A 77.95.250.5
auth10.dns.internl.net. 5 AAAA 2a00:1478:40:f:8:3031:0:1
auth20.dns.internl.net. 5 AAAA 2a00:1478:40:f:8:3033:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0