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 informationon people and resources within an organisation, facilitatingmanagement and communication.

On a LAN or WAN the directory service identifies allaspects of the network including users, software, hardware,and the various rights and policies assigned to each. As aresult applications can access information without knowingwhere a particular resource is physically located, and usersinteract oblivious to the network topology and protocols.

To allow heterogeneous networks to share directoryinformation the ITU proposed a common structure calledX.500. However, its complexity and lack of seamlessInternet support led to the development of Lightweight Directory Access Protocol (LDAP) which has continued toevolve under the aegis of the IETF. Despite its name LDAPis too closely linked to X.500 to be "lightweight".

LDAP was adopted by several companies such as Netscape Communications Corporation (Netscape Directory Server) andhas become a de facto standard for directory services.Other LDAP compatible offerings include Novell, Inc.'sNovell Directory Services (NDS) and Microsoft Corporation's Active Directory. The Netscape and Novellproducts are available for Windows NT and Unixplatforms. Novell Directory Services also run on Novellplatforms. Microsoft Corporation's Active Directory is anintegral part of Microsoft's Windows 2000 and although itcan interface with directory services running on other systemsit 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.

单词	directory service
释义	DictionarySeedirectory 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 informationon people and resources within an organisation, facilitatingmanagement and communication. On a LAN or WAN the directory service identifies allaspects of the network including users, software, hardware,and the various rights and policies assigned to each. As aresult applications can access information without knowingwhere a particular resource is physically located, and usersinteract oblivious to the network topology and protocols. To allow heterogeneous networks to share directoryinformation the ITU proposed a common structure calledX.500. However, its complexity and lack of seamlessInternet support led to the development of Lightweight Directory Access Protocol (LDAP) which has continued toevolve under the aegis of the IETF. Despite its name LDAPis too closely linked to X.500 to be "lightweight". LDAP was adopted by several companies such as Netscape Communications Corporation (Netscape Directory Server) andhas become a de facto standard for directory services.Other LDAP compatible offerings include Novell, Inc.'sNovell Directory Services (NDS) and Microsoft Corporation's Active Directory. The Netscape and Novellproducts are available for Windows NT and Unixplatforms. Novell Directory Services also run on Novellplatforms. Microsoft Corporation's Active Directory is anintegral part of Microsoft's Windows 2000 and although itcan interface with directory services running on other systemsit 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. LegalSeeDirectory
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