ns2.linknettelecom.tec.br has no CNAME records.
Question and response
Question
dig ns2.linknettelecom.tec.br. NS
Answer
The response has no answer records.
Authority
linknettelecom.tec.br. 300 SOA ns1.linknettelecom.tec.br. hostmaster.linknettelecom.tec.br. 2023022470 14400 3600 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0