Apex domains cannot have CNAME records.
Question and response
Question
dig systec.fi. NS
Answer
systec.fi. 5 NS dns3.web1.fi.
systec.fi. 5 NS dns2.web1.fi.
systec.fi. 5 NS dns1.web1.fi.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0