what is the use of NIS how can u configure

NIS, (Network Information Services), enables account logins
and other services (host name resolution, xinetd network
services configuration, ...), to be centralized to a single
NIS server.
NIS allows a central server to manage password
authentication, host, services, etc which would normally be
provided by the local
files /etc/passwd, /etc/shadow, /etc/groups, /etc/hosts, /et
c/services, /etc/networks, /etc/rpc, /etc/protocols, /etc/al
iases