NIS+ provides an NIS compatibility mode. This mode lets an NIS+ server running the Solaris Operating Environment answer requests from NIS as well as NIS+ clients. After the NIS+ server is set up, you can select NIS compatibility mode. You do not need to do any additional setup or changes for the NIS client. The NIS+ compatibility mode is one way that you can gradually make the transition from NIS to NIS+.
The comparison between master servers and slave servers is as follows. NIS master servers know about NIS slave servers only; NIS does not know about NIS+. NIS+ master servers interact with NIS+ replica servers only. NIS+ does not convert NIS+ tables into maps and push them to NIS slave servers.