Apex domains cannot have CNAME records.
Question and response
Question
dig dca.net. NS
Answer
dca.net. 5 NS ns2.dca.net.
dca.net. 5 NS ns1.dca.net.
Authority
The response has no authority records.
Additional
ns1.dca.net. 5 A 207.245.84.201
ns2.dca.net. 5 A 207.245.82.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0