NIS+ Client/server Model
Unlike NIS, NIS+ uses a hierarchical structure of multiple domains. A NIS+ domain can, and should, be serviced by multiple servers. The primary server is known as the master server, and backup servers are known as replica servers. Both types hold copies of the NIS+ tables. Changes are first committed to the master server and then propagated to replica servers in increments.
NIS+ table permissions determine a user's level of access to the table's contents.
Read more about this topic: NIS+
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