Originally written by four graduate students at the Computer Systems Research Group at the University of California, Berkeley (UCB), the name originates as an acronym from Berkeley Internet Name Domain.
It associates various information with domain names assigned to each of the participating entities.
Most importantly, it translates domain names meaningful to humans into the numerical identifiers associated with networking equipment for the purpose of locating and addressing these devices worldwide.
How does a file tells the name server whether it is the primary master or a slave on a per-zone basis.
The NS records don't tell us which server is the primary master for a zone and which servers are slaves -- they only say who the servers are.
A primary master name server reads its data from zone data files.
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.Dynamic update permits more than the simple addition and deletion of records.Updaters can add or delete individual resource records, delete ), or even delete all records associated with a given domain name.NOTIFY messages ensure zone changes are rapidly propagated to the slaves (interrupt driven) rather than rely on the slave server periodically polling for changes.You need to set up another name server for robustness.A second name server splits the load with the first server or handles the whole load if the first server is down.