Apex domains cannot have CNAME records.
Question and response
Question
dig encirca.com. NS
Answer
encirca.com. 5 NS dnssec1.encirca.net.
encirca.com. 5 NS dnssec2.encirca.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0