Apex domains cannot have CNAME records.
Question and response
Question
dig isp.as2116.net. NS
Answer
isp.as2116.net. 4 NS ns02.no.brand.one.com.
isp.as2116.net. 4 NS ns01.no.brand.one.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0