Network Information Service Plus (NIS+)
NIS+ is similar to NIS but provides additional features and improvements. In addition to providing centralized administration and access to domain data, it also supports hierarchical domains that can be configured to reflect the structure of an organization. NIS provides only a flat domain. Whereas NIS provides no authentication, NIS+ provides Data Encryption Standard (DES)-based authentication. In addition, whereas NIS propagates updated information in a batch mode, NIS+ propagates incremental updates immediately. Like NIS, NIS+ supports the optional use of redundant servers (referred to as replicas). These replicas provide load balancing and alternative servers in case the master NIS+ server fails.
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