Apex domains cannot have CNAME records.
Question and response
Question
dig in.mynet.it. NS
Answer
in.mynet.it. 5 NS ns2.mynet.it.
in.mynet.it. 5 NS ns1.mynet.it.
Authority
The response has no authority records.
Additional
ns1.mynet.it. 5 A 77.241.15.249
ns2.mynet.it. 5 A 80.68.177.40
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0