The dhcpconfig command first determines whether NIS+ or files is currently being used by the server system. If NIS+ is currently being used by the system, then nisplus is the default value in the Enter data store prompt. Otherwise, files is the default.
If you choose NIS+ and the server is not running NIS+, a warning message is displayed and you are told how to set up NIS+. The dhcpconfig script continues (although it is likely that errors will occur in the next section when creating DHCP tables).
NIS+ should be used if you have an environment with multiple servers, or an enterprise environment. With NIS+, data can be shared among servers. Files can be used if you have only a single server unless you arrange to share data using NFS.