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DAP Directory Access Protocol. X.500 protocol used to access directory services.

DISP Directory Information Shadowing Protocol. X.500 protocol used to copy directory information between servers.

DIT Directory Information Tree. The organization of directory entries forming a hierarchical structure.

DN Directory Name. A structured name used to reference entries in X.500 or LDAP directory services.

DSA Directory System Agent. A directory server in an X.500 network.

DSP Directory System Protocol. X.500 protocol implementing system level communication between directory servers.

DUA Directory User Agent. A directory client program. Generally the application that a user uses to access the directory service.

IETF Internet Engineering Task Force.

ISO International Standards Organization.

ITU International Telecommunication Union.

LDAP Lightweight Directory Access Protocol. An application protocol used to access directory services. The target service can be based on directory services employing newer protocols in the LDAP family or an X.500 service with an LDAP port. LDAP is, at present, a functional subset of X.500, though the protocol family is currently being extended and enhanced through IETF activity. The base LDAP protocol is currently at version 3.

X.500 A set of protocols defined by ISO and the ITU to define an open directory service. The X.500 family of protocols includes DAP, DSP and DISP. The X.500 protocol is currently in its third version (the three versions being labelled by year - 88, 93 and now 97).