4.2. How NIS+
NIS+ is a new version of the network information nameservice
from Sun. The biggest difference between NIS and NIS+ is that NIS+
has support for data encryption and authentication over secure
The naming model of NIS+ is based upon a tree structure. Each
node in the tree corresponds to an NIS+ object, from which we have
six types: directory, entry, group, link, table and private.
The NIS+ directory that forms the root of the NIS+ namespace is
called the root directory. There are two special NIS+ directories:
org_dir and groups_dir. The org_dir directory consists of all
administration tables, such as passwd, hosts, and mail_aliases. The
groups_dir directory consists of NIS+ group objects which are used
for access control. The collection of org_dir, groups_dir and their
parent directory is referred to as an NIS+ domain.