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DNS Server Types - Definition

DNS Server Types - Primary DNS Server: A Primary (master) DNS Server can be setup to be a zone transfer server. Zone transfer will allow the DNS Server to query other DNS Servers if it is unable to resolve the request. A Primary Server maintains the master copy of DNS information. Most DNS zones also have at least one slave or Secondary server. Secondary DNS Server: A Secondary DNS server uses Zone Transfers to collect the DNS database from its Primary DNS Server. Caching DNS Server: A Caching DNS Server does not maintain any static DNS records. All of its records are created by resolving DNS queries to a Primary or Secondary DNS server. Caching DNS servers thus add redundancy to the DNS namespace.

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