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On a network with NIS, the netgroup input file on the master NIS server is used to generate three NIS maps: netgroup, netgroup.byuser, and netgroup.byhost. The NIS map netgroup contains basic information in the netgroup input file. The other two maps contain information in a format that speeds lookup of netgroups, given the host or user.
Various programs use the netgroup NIS maps for permission checking during login, remote mount, remote login, and remote shell creation. These programs include: mountd(1Mnfs), login(1), rlogin(1tcp), and rsh(1tcp). The login command consults them for user classifications if it encounters netgroup names in the passwd file. The mountd daemon consults them for machine classifications if it encounters netgroup names in the netgroup file. The rlogin and rsh commands consult the netgroup maps for both machine and user classifications if they encounter netgroup names in the /etc/hosts.equiv or .rhosts file. For more information about netgroups, refer to the netgroup(4nis) manual page.