NIS+ is a name service built on top of the ONC transport-independent remote procedure call (RPC) interface. NIS+ has significant benefits compared to NIS in the areas of security, performance, scalability, and administration. Some of the advantages of using NIS+ are:
NIS+ shares data with the NIS environments, allowing a smooth migration.
Domains are hierarchical; you can create subdomains.
NIS+ enables you to create and maintain an enterprise-wide name service, even across geographically separated sites connected by WAN links.
You can use the NIS+ backup and restore feature to quickly and easily preserve your name space data set. This feature can also be used to quickly bring additional replica servers online.