ArcGIS GIS Server capabilities and extensions—ArcGIS Server
https://enterprise.arcgis.com/en/server/latest/get-started/windows/server-extensions.htm
ArcGIS Network Analyst extension. The ArcGIS Network Analyst extension provides advanced network data analysis capabilities via web services. Deploy powerful network analysis tools, such as multipoint optimized routing, time-sensitive, turn-by-turn driving directions, service area allocation, and fastest fixed route to the closest facility.
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