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2. Internet Protocol Control Protocol - Wikipedia

   en.wikipedia.org/wiki/Internet_Protocol_Control...

   Primary DNS Server Address. RFC 1877: 130 6: Primary NBNS Server Address. RFC 1877: 131 6: Secondary DNS Server Address. RFC 1877: 132 6: Secondary NBNS Server ...

3. Comparison of DNS server software - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_DNS_server...

   Authoritative name servers can be primary name servers, also known as master servers, i.e. they contain the original set of data, or they can be secondary or slave name servers, containing data copies usually obtained from synchronization directly with the primary server, either via a DNS mechanism, or by other data store synchronization ...

4. SOA record - Wikipedia

   en.wikipedia.org/wiki/SOA_record

   Serial number for this zone. If a secondary name server slaved to this one observes an increase in this number, the slave will assume that the zone has been updated and initiate a zone transfer. REFRESH Number of seconds after which secondary name servers should query the master for the SOA record, to detect zone changes.

5. DNS zone transfer - Wikipedia

   en.wikipedia.org/wiki/DNS_zone_transfer

   DNS zone transfer, also sometimes known by the inducing DNS query type AXFR, is a type of DNS transaction. It is one of the many mechanisms available for administrators to replicate DNS databases across a set of DNS servers .

6. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   A primary server is a server that stores the original copies of all zone records. A secondary server uses a special automatic updating mechanism in the DNS protocol in communication with its primary to maintain an identical copy of the primary records. Every DNS zone must be assigned a set of authoritative name servers.

7. Name server - Wikipedia

   en.wikipedia.org/wiki/Name_server

   A secondary server for a zone uses an automatic updating mechanism to maintain an identical copy of the primary server's database for a zone. Examples of such mechanisms include DNS zone transfers and file transfer protocols. DNS provides a mechanism whereby the primary for a zone can notify all the known secondaries for that zone when the ...