Apex domains cannot have CNAME records.
Question and response
Question
dig fim.ch. NS
Answer
fim.ch. 5 NS ns-99-b.gandi.net.
fim.ch. 5 NS ns-203-c.gandi.net.
fim.ch. 5 NS ns-170-a.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0