Apex domains cannot have CNAME records.
Question and response
Question
dig link.net.id. NS
Answer
link.net.id. 5 NS dns2.link.net.id.
link.net.id. 5 NS ns1.fast.net.id.
link.net.id. 5 NS dns1.link.net.id.
Authority
The response has no authority records.
Additional
dns1.link.net.id. 5 A 202.137.3.120
dns2.link.net.id. 5 A 202.137.3.121
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0