Directory System Agent
A Directory System Agent (DSA) is the element of a 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). 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.
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.
Clients connect to an Active Directory DSA using various communications protocols:
- LDAP version 3.0 — used by Windows 2000 and Windows XP clients
- LDAP version 2.0
- Security Account Manager (SAM) interface — used by Windows NT clients
- MAPI RPC interface — used by Microsoft Exchange Server and other MAPI clients
- A proprietary RPC interface — used by Active Directory DSAs to communicate with one another and replicate data amongst themselves
- 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. p. 219. ISBN 978-0-471-35198-6.
- "X.500: Directory Access Protocol (DAP)". Javvin Technologies, Inc. Retrieved 2005-09-22.
- "Platform SDK: Active Directory: Directory System Agent". MSDN. Microsoft. Retrieved 2005-09-22.
- "Active Directory: Active Directory Diagnostics, Troubleshooting, and Recovery: Summary of Active Directory Architecture: Directory System Agent". Windows 2000 Server Resource Kit. Microsoft. Retrieved 2010-10-02.
- RFC 2148 — Deployment of the Internet White Pages Service
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