Apex domains cannot have CNAME records.
Question and response
Question
dig rootnet.nl. NS
Answer
rootnet.nl. 5 NS nsauth.myrootnet.nl.
rootnet.nl. 5 NS nsauth.myrootnet.com.
Authority
The response has no authority records.
Additional
nsauth.myrootnet.nl. 4 A 185.173.20.5
nsauth.myrootnet.com. 4 A 87.233.176.5
nsauth.myrootnet.nl. 4 AAAA 2a0b:3100:53:0:0:0:0:10
nsauth.myrootnet.com. 4 AAAA 2001:9a8:0:1b:53:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0