dns.nic.net.tw has no CNAME records.
Question and response
Question
dig dns.nic.net.tw. NS
Answer
The response has no answer records.
Authority
nic.net.tw. 10800 SOA dns.twnic.net.tw. snw.twnic.net.tw. 199912113 7200 1800 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0