Directory Services
The notion of a directory is similar to the name services concept, but it goes one step further: Instead of simply resolving a name to a number, directory services offer many pieces of vital data on the network. In particular, directory services allow users from all over to log in to the network rather than into a specific server; each server on the network relies on the directory services to assign security rights, and so on.
This is terrific because administrators no longer need to update multiple servers with username and password information; instead, they can administer updates from one point and distribute them throughout the network. The long-term goal has been simplification, which makes troubleshooting easier, but ...
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