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 ?
The Microsoft Exchange directory service does not exist in isolation: it coexists with the directory services of other network components, often including the Windows NT directory service.
The smaller the enterprise, however, the more limited directory management can be, relative to directory services.
PSN is delivering on its promise of providing seamless, global directory services to the digital photography industry," said Lisa Walker, president of I3A and PSN.
The iVoice Speech Enabled Auto Attendant, with Directory Services, was sold and installed by iVoice partner the OAS Group.
com directory service ensures that the essential details are always readily to hand.
Designed to simplify the process of finding and using Internet-connected and retail photo services, PSN is scheduled to launch its Directory Service in late June 2003.
The introduction of the PSN Directory Service and the CPXe specifications gives life to the imaging industry's vision for making it as convenient to get prints and other photo services from digital pictures as it is today with film," said Lisa Walker, president, International Imaging Industry Association.
Fast Search & Transfer(TM) (FAST), a leading developer of search and real-time alerting technologies, and Opplysningen(R) 1881 Online, the premier Directory Service of Telenor Teleservice AS, announced today that Opplysningen 1881 Online has selected FAST Data Search(TM) to search its 6.
By implementing the Managed DNS Service, NutriSystem's online presence is supported by UltraDNS' global Directory Services Platform, with network nodes spanning four continents, capable of handling and efficiently routing enormous traffic levels.
This expansion of the UltraDNS Directory Services Platform significantly enhances the online experience for more than 39 million Internet users in India.
Infospace Search & Directory, a leading Web search and online directory services provider and a business of Infospace, Inc.
Microsoft Product Unit Manager for Directory Services Stuart Kwan will keynote the conference, highlighting where Active Directory is being used by customers today, and what the future holds for Microsoft directory services.

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