Apex domains cannot have CNAME records.
Question and response
Question
dig rrdns.pch.net. NS
Answer
rrdns.pch.net. 3 NS admin1.sjc.rrdns.pch.net.
rrdns.pch.net. 3 NS ns1.quadnine.org.
Authority
The response has no authority records.
Additional
admin1.sjc.rrdns.pch.net. 3 A 216.21.3.41
admin1.sjc.rrdns.pch.net. 3 AAAA 2620:0:871:9000:0:0:0:41
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0