Directory Service is a collection of software that is used to store information about an enterprise. It generally consists of at least one directory server and one or more directory clients |
DNS is an example of of a well-known client-server directory. Service (information limited to IP addresses and names) |
A true directory service is used to store virtually unlimited types of information |
Each e-mail system has its own directory system which maps user's name to an e-mail address. These directories cannot exchange information |
Problem: every enterprise is using too many directory services which do not share data between themselves (it is known as N+1 problem) |