Apex domains cannot have CNAME records.
Question and response
Question
dig oxfordnetworks.com. NS
Answer
oxfordnetworks.com. 4 NS ns1.oxfordnetworks.net.
oxfordnetworks.com. 4 NS dns1.firstlight.net.
oxfordnetworks.com. 4 NS ns2.oxfordnetworks.net.
oxfordnetworks.com. 4 NS dns2.firstlight.net.
Authority
The response has no authority records.
Additional
ns1.oxfordnetworks.net. 4 A 72.12.70.169
ns2.oxfordnetworks.net. 4 A 209.198.94.19
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0