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