SunOS release 5.7 software installed on all servers and clients
SunOS release 5.7 software installed on one server, but combined with some SunOS release 4 servers
Upgrade all servers and clients to NIS+
Upgrade all servers at once to NIS+ and enable its compatibility mode to support SunOS release 4 clients
Use different domain names so NIS and NIS+ can coexist
The first step to upgrading your network is to decide which servers to upgrade to the NIS+ name service and which servers can continue to run NIS. See NIS+ Transition Guide for more information.