Master Server will resolve the names for every hosts which we defined in the zone database and use UDP protocol, because UDP protocols never use the acknowledgement process while tcp uses acknowledgement.DNS servers also use UDP protocols to resolve the query request at the earliest. (dot) at the end of the say to search the root server of namespace.The Domain Name System (DNS) is a hierarchical naming system built on a distributed database for computers, services, or any resource connected to the Internet or a private network.It associates various information with domain names assigned to each of the participating entities.
Secondary servers are recommended in larger setups.
With BIND 9.9.x, the slave zone files are now saved in a default raw binary format.
This was done to improve performance, but at the sacrifice of being able to easily view the contents of the files.
Note: There are some issues with this Howto, too numerable to fix quickly, and it requires bringing up to standard. in all other places, the document uses the machine name example ns.
I'm mentioning this to help anyone to avoid the unnecessary time trying to resolve their DNS, owing the the inconsistencies in this document, particularly if you're new to DNS configuration. Here it changes to box (I believe the author was simply trying to show that additional computers would be listed, but failed to use a different address for box.