The Cisco WSA can enforce bandwidth restrictions for web applications by using the Application Visibility and Control (AVC) engine. The AVC engine allows the WSA to identify and control application activity on the network, and to apply bandwidth limits to certain application types or individual applications. The WSA dynamically creates a scavenger class QoS policy and applies it to each client that connects through the WSA. The scavenger class QoS policy assigns a low priority to the application traffic and limits the bandwidth usage based on the configured settings. This way, the WSA can prevent congestion and ensure fair allocation of bandwidth among different applications and users. References:
User Guide for AsyncOS 11.8 for Cisco Web Security Appliances - GD (General Deployment) - Managing Access to Web Applications
WSA - limit bandwidth - Cisco Community
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