For example, a machine can be a primary master server for one zone and a secondary master server for another zone. These different server functions can be performed by the same machine. If your network is not connected to the Internet, you must set up your own root domain server. If your network is connected to the Internet, your root domain servers are out on the Internet itself. A root domain server is the authoritative server for the top of your DNS domain hierarchy. A cache-only server is a server that is not a master server for any zone other than the in-addr.arpa. All servers are caching servers in the sense that they maintain a cache of DNS data. (See "Primary Master Server".)Ĭache-only Server. Secondary master servers obtain their DNS data from the zone's primary master server. A zone can have one or more secondary master servers. Each zone has one server that is designated as the primary master server for that zone. Master servers are commonly called authoritative name servers. A master name server maintains all the data corresponding to the zone, making it the authority for that zone. ![]() ![]() DNS servers perform one or more functions:
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