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directory-service
is-subclass-of
- internet-service [ superclass ]
contains
- Directory Information Base, DIB [ content ]
is-part-of
- Directory System Agent (DSA) [ part ]
- Directory User Agent (DUA) [ part ]
Comment:
designed for reading more than writing
example
X.500, LDAP, Microsoft's Active Directory, Novell's NDS...
history
early times proprietary directories -> little or no incentive to work with any other system
Comment:
special purpose databases designed to assist in locating organizations, people, and other entities (servers, printers, databases, groups, applications, etc)
Comment:
used for e-mail addressing, user authentication (e.g., logins and passwords), or network security (e.g., user-access rights)
Comment:
organizations and other entities are linked together using a hierarchical tree structure
Instances (examples):