Directory System Agent
A Directory System Agent (DSA) is the element of an X.500 directory service that provides User Agents with access to a portion of the directory (usually the portion associated with a single Organizational Unit).[1][2][3] X.500 is an international standard developed by the International Organization for Standardization (ISO), and the International Telecommunication Union (ITU-T). The model and function of a directory system agent are specified in ITU-T Recommendation X.501.
Active Directory
In Microsoft's Active Directory the DSA is a collection of servers and daemon processes that run on Windows Server systems that provide various means for clients to access the Active Directory data store.[4][5]
Clients connect to an Active Directory DSA using various communications protocols:
- LDAP version 3.0—used by Windows 2000 and Windows XP clients[4][5]
- LDAP version 2.0[4][5]
- Security Account Manager (SAM) interface—used by Windows NT clients[4][5]
- MAPI RPC interface—used by Microsoft Exchange Server and other MAPI clients[4][5]
- A proprietary RPC interface—used by Active Directory DSAs to communicate with one another and replicate data amongst themselves[4][5]
References
- ↑ Daniel Blum (1989-10-30). "Details of X.500 architecture". Network World (IDG Network World Inc) 6 (43): 58. ISSN 0887-7661.
- ↑ Zahir Tari and Omran Bukhres (2001). Fundamentals of distributed object systems: the CORBA perspective. Parallel and distributed computing. 8. John Wiley and Sons. pp. 219. ISBN 978-0-471-35198-6.
- ↑ "X.500: Directory Access Protocol (DAP)". Javvin Technologies, Inc.. Archived from the original on 2005-11-23. https://web.archive.org/web/20051123033401/http://www.javvin.com/protocolX500.html. Retrieved 2005-09-22.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "Platform SDK: Active Directory: Directory System Agent". MSDN. Microsoft. http://msdn.microsoft.com/library/en-us/ad/ad/directory_system_agent.asp. Retrieved 2005-09-22.
- ↑ 5.0 5.1 5.2 5.3 5.4 5.5 "Active Directory: Active Directory Diagnostics, Troubleshooting, and Recovery: Summary of Active Directory Architecture: Directory System Agent". Windows 2000 Server Resource Kit. Microsoft. https://technet.microsoft.com/en-us/library/cc961806.aspx. Retrieved 2010-10-02.
RFCs
- RFC 2148 — Deployment of the Internet White Pages Service
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