See the exhibit of DNS lookup with dig command:

What might be wrong in the zone definition?
Select an option, then click Submit answer.
-
○
Nothing all seems to be good
-
○
There’s no “.” after linuserv.example.net in the PTR record in the forward lookup zone file
-
○
There’s no “.”after linuserv in the PTR record in the forward lookup zone file
-
○
There’s no “.” after linuserv.example.net in the PTR record in the reverse lookup zone file
-
○
The “.” in the NS definition in reverse lookup zone has to be removed