Apex domains cannot have CNAME records.
Question and response
Question
dig alog.com.br. NS
Answer
alog.com.br. 5 NS dns2.p07.nsone.net.
alog.com.br. 5 NS dns3.p07.nsone.net.
alog.com.br. 5 NS dns4.p07.nsone.net.
alog.com.br. 5 NS dns1.p07.nsone.net.
Authority
The response has no authority records.
Additional
dns2.p07.nsone.net. 2 A 198.51.45.7
dns4.p07.nsone.net. 2 A 198.51.45.71
dns2.p07.nsone.net. 2 AAAA 2a00:edc0:6259:7:7:0:0:2
dns4.p07.nsone.net. 2 AAAA 2a00:edc0:6259:7:7:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0