Ans:
Following are the main features of Directory
Services
Ø A directory
service is a software system that
stores, organizes, and provides access to information in a computer operating system's directory.
Ø Directory
services were invented to bring organization to
networks.
Ø User
can query the directory service for a service name (such as the name of a
network folder or a printer), and the directory service tells user where the
service is located.
Ø Directory
services enable you to browse all the resources on a network easily, in one
unified list organized in a tree structure.
One important advantage of directory services is that they eliminate
the need to manage duplicates of anything on the network because the directory
is automatically shared among all of the servers. For example, you don’t
need to maintain separate user lists on each server. Instead, you manage a
single set of user accounts that exists in the directory service and then
assign them various permissions to particular resources on any of the servers.
From the users’
perspective, they have only one network account with one password, and they
don’t need to worry about where resources are located or keep track of multiple
passwords for different network services or servers.
To provide redundancy,
directory services usually run on multiple servers in an organization, with
each of the servers having a complete copy of the entire directory service
database. Because a directory service becomes central to the functioning of a network,
this approach lets the network as a whole continue to operate if any single server
with directory services on it crashes. Servers that do not actually host a copy
of the directory still make use of it by communicating with the directory
servers.
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