directory service


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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 ?
Lastly, modification of directory services through appropriate directory management creates new and lucrative markets for resellers.
com is the UK's leading online classified directory service and the information it provides is available via three channels: the web, mobile and interactive TV.
The combined impact of CPXe specifications and the PSN Directory Service will greatly simplify for businesses and their customers the process of finding and using Internet-connected and retail photo services.
The combined impact of CPXe specifications and the PSN Directory Service will simplify for consumers the process of finding and using Internet-connected and retail photo services.
The value of a Directory Service lies in both the quality of information it incorporates, and how easy and accurate that information is to access," said Bent Roger Helland, product manager of Opplysningen 1881 Online.
In response to market demand, Bell Atlantic Directory Services is adding other major sites in 1994 and early 1995 for InfoTravel implementation," said Tom Pelletreau, director, new business development, Bell Atlantic Directory Services.
The UltraDNS Directory Services Platform allows NutriSystem to cost-effectively scale its infrastructure and provides the network control and management it requires to drive fundamental change in the weight loss industry.
So intelligent use of NetWare Directory Services would be a real benefit," said Warren.
UltraDNS will continue to expand our Directory Services Platform to meet demand from Internet users globally and from our enterprise and infrastructure customers.
The database and programming will be provided by Bell Atlantic Directory Services.
Infospace occupies a strong position in the Web search and online directory services markets, with award-winning products, millions of loyal users and a long list of top tier distribution customers," said Bowman.
NetPro delivers the only comprehensive suite of solutions designed to manage network directory services for 24x7 availability throughout the directory lifecycle.

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