The X.500 directory service is a global directory service. Its components cooperate to manage information about objects such as countries, organizations, people, machines, and so on in a worldwide scope. It provides the capability to look up information by name (a white-pages service) and to browse and search for information (a yellow-pages service).
The information is held in a directory information base (DIB). Entries in the DIB are arranged in a tree structure called the directory information tree (DIT).
The X.500 namespace is hierarchical. An entry is unambiguously identified by a distinguished name (DN). A distinguished name is the concatenation of selected attributes from each entry, called the relative distinguished name (RDN), in the tree along a path leading from the root down to the named entry.
Users of the X.500 directory may (subject to access control) interrogate and modify the entries and attributes in the DIB.
The protocols defined by X.500 include
DAP (Directory Access Protocol)
DSP (Directory System Protocol)
DISP (Directory Information Shadowing Protocol)
DOP (Directory Operational Bindings Management Protocol)
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