Apex domains cannot have CNAME records.
Question and response
Question
dig brsite.net. NS
Answer
brsite.net. 1 NS ns1.brs.com.br.
brsite.net. 1 NS ns2.brs.com.br.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0