Apex domains cannot have CNAME records.
Question and response
Question
dig novanet.is. NS
Answer
novanet.is. 5 NS ns1.nova.is.
novanet.is. 5 NS ns2.nova.is.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0