Apex domains cannot have CNAME records.
Question and response
Question
dig brasilis.com.br. NS
Answer
brasilis.com.br. 2 NS nss.brasilis.com.br.
brasilis.com.br. 2 NS nsp.brasilis.com.br.
brasilis.com.br. 2 NS nst.brasilis.com.br.
Authority
The response has no authority records.
Additional
nsp.brasilis.com.br. 2 A 186.237.194.22
nss.brasilis.com.br. 2 A 186.237.194.23
nst.brasilis.com.br. 2 A 186.237.201.18
nsp.brasilis.com.br. 2 AAAA 2804:270:ff:ff0f:0:0:0:4
nss.brasilis.com.br. 2 AAAA 2804:270:ff:ff0f:0:0:0:5
nst.brasilis.com.br. 2 AAAA 2804:270:2ff:ff0b:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0