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).
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.
[4][5] Clients connect to an Active Directory DSA using various communications protocols:
This computer data storage-related software article is a stub.