Apex domains cannot have CNAME records.
Question and response
Question
dig suomicom.com. NS
Answer
suomicom.com. 5 NS ns3.suomicom.com.
suomicom.com. 5 NS ns4.suomicom.com.
suomicom.com. 5 NS ns2.suomicom.fi.
suomicom.com. 5 NS ns1.suomicom.fi.
suomicom.com. 5 NS ns5.suomicom.com.
Authority
The response has no authority records.
Additional
ns1.suomicom.fi. 5 A 217.119.36.5
ns2.suomicom.fi. 5 A 217.119.37.5
ns3.suomicom.com. 5 A 185.42.137.98
ns4.suomicom.com. 5 A 194.58.192.32
ns5.suomicom.com. 5 A 194.58.198.32
ns1.suomicom.fi. 5 AAAA 2a00:1190:53:aa1:0:0:0:1
ns2.suomicom.fi. 5 AAAA 2a00:1190:53:aa2:0:0:0:1
ns3.suomicom.com. 5 AAAA 2a01:3f0:400:0:0:0:0:32
ns4.suomicom.com. 5 AAAA 2a01:3f1:32:0:0:0:0:53
ns5.suomicom.com. 5 AAAA 2a01:3f1:3032:0:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0