Zone Transfers

Zone Transfers

There is one primary name server for each zone, and typically at least
one other secondary name server. The secondary name servers within a
zone need to have a current version of the zone file, the file containing
the host to IP mappings for every host within the zone. Certain
conditions exist where a secondary name server will request a zone
transfer:
• The secondary name server has just been placed on the network or
the DNS service has just been restarted.
• The time specified by the Refresh field on the secondary name
server has elapsed.