Apex domains cannot have CNAME records.
Question and response
Question
dig xetnet.fi. NS
Answer
xetnet.fi. 1 NS mary.ns.cloudflare.com.
xetnet.fi. 1 NS theo.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0