1.1.4 Downstream Server (DSS)

WSUS has a hierarchical topology of servers with individual child servers that are configured either as an autonomous downstream server (DSS) or as a replica DSS, as described in [MS-WSUSSS] section 1.3. A DSS synchronizes update metadata and content as specified in [MS-WSUSSS] section 3.2.4.2and section 3.2.4.4, respectively. If the DSS is configured as a replica DSS, it additionally synchronizes the deployments , as specified in [MS-WSUSSS] section 3.2.4.3.

The update metadata, content, and deployment that are synchronized in this way on a WSUS server are used to determine available, applicable software updates for an individual update client. The protocol between an update client and its update server is specified in [MS-WUSP].