Here are the various fields.
Whenever you create a new zone (domain or IP reverse mapping), the template domain is used to initialized the new zone. The template domain is one domain you have already created.
The template domain is used when you create a new domain either interactively or from the command line. The information copied is:
A DNS either knows directly the answer to a query (it is a request for a domain it is authoritative for) or can solve it by asking other DNSs. It does the later either by doing a top down query using the Internet root DNS or by asking other servers known as forwarders.
This check box disable the first behavior: The DNS will only use predefined forwarders (see the forwarders dialog).
We generally use this feature for DNS without proper Internet connectivity or to hook together domains not registered officially (with the various Internet registry out there).
By default, a DNS will solve a request by doing a top down search (from the root servers, down to the authoritative servers for a domain). When "no recursion" is selected, the DNS will return to the caller some hint so it can solve itself the request.
While solving requests, the DNS collects has much information as needed and caches it for future use. With "no fetch glue", the DNS does not cache the intermediate informations.
Simulate the obsolete DNS query type IQUERY.
Notify secondary server when some zones/domains are updated so they can update as needed.
For security reason, some are running the DNS server in a chroot environment. The server is locked in a sub-directory. To enter this sub-directory path here.
Inside this sub-directory, you still have the /var/named directory and friends.