Apex domains cannot have CNAME records.
Question and response
Question
dig geneseo.net. NS
Answer
geneseo.net. 5 NS ns3.geneseo.net.
geneseo.net. 5 NS puck.nether.net.
Authority
The response has no authority records.
Additional
ns3.geneseo.net. 5 A 208.123.225.14
puck.nether.NET. 5 A 204.42.254.5
puck.nether.NET. 5 AAAA 2602:fe55:5:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0