Apex domains cannot have CNAME records.
Question and response
Question
dig nic.net.tw. NS
Answer
nic.net.tw. 5 NS dns.nic.net.tw.
nic.net.tw. 5 NS dns.twnic.net.tw.
Authority
The response has no authority records.
Additional
dns.nic.net.tw. 5 A 140.111.246.11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0