directory service


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Related to directory service: Active Directory Service

directory service

[də′rek·trē ‚sər·vəs]
(computer science)
A directory of the names and addresses of all the mail recipients on a particular network, which provides electronic mail addresses.
A provider of online directories of Web sites and search engines.

directory service

(database, networking)
A structured repository of information on people and resources within an organisation, facilitating management and communication.

On a LAN or WAN the directory service identifies all aspects of the network including users, software, hardware, and the various rights and policies assigned to each. As a result applications can access information without knowing where a particular resource is physically located, and users interact oblivious to the network topology and protocols.

To allow heterogeneous networks to share directory information the ITU proposed a common structure called X.500. However, its complexity and lack of seamless Internet support led to the development of Lightweight Directory Access Protocol (LDAP) which has continued to evolve under the aegis of the IETF. Despite its name LDAP is too closely linked to X.500 to be "lightweight".

LDAP was adopted by several companies such as Netscape Communications Corporation (Netscape Directory Server) and has become a de facto standard for directory services. Other LDAP compatible offerings include Novell, Inc.'s Novell Directory Services (NDS) and Microsoft Corporation's Active Directory. The Netscape and Novell products are available for Windows NT and Unix platforms. Novell Directory Services also run on Novell platforms. Microsoft Corporation's Active Directory is an integral part of Microsoft's Windows 2000 and although it can interface with directory services running on other systems it is not available for other platforms.

directory service

A database that is queried more often than it is updated. Directories tend to be lists of data that may occasionally change but are queried constantly, such as resources in a network (see network directory), contact lists and business directories (Yellow Pages, etc.). See X.500 and LDAP.
References in periodicals archive ?
BANKING AND CREDIT NEWS-December 15, 2016-Generational Equity sells Hanson Directory Services
The plethora of usernames and passwords users were required to use led to the use of directory services to provide a means of authentication and a central identity store.
Mobile Directory Services is driven by the need to provide and offer Namibians a more affordable, more accessible and user friendly telephone directory.
SECURITY OF THE ACTIVE DIRECTORY DIRECTORY SERVICES
The directory service provides a list of hotspots to meet the user's specifications, to include full contact details and a link to a Multimap interactive street-level map, with information about supported authentication modes included.
Other parts of the new directory service will see BT offer customers onward connection, including to mobile phones for the first time.
The move comes after Oftel ended BT's near-monopoly of voice-based directory services and allocated numbers with the 118 prefix to rivals.
SuperPages.com also powers directory services on Excite, Lycos, AltaVista, Ask Jeeves, HotBot, BigFoot, AOL Service, AOL.com, and Digital City.
has announced the launch of a new directory service for the information industry.
Web Dialer' is an online directory service that allows the caller to initiate any phone call from a web page by clicking on a selection from personalised 'buddy lists'.
Novell Inc is porting its Novell Directory Service (NDS) to Compaq Computer Corp's Tru64 Unix, which will give NDS important new exposure to enterprise markets according to CEO Eric Schmidt.

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