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