Which component of the ProxySG evaluates user requests for policy compliance?

The correct answer is the Policy engine, as it is the component of the ProxySG responsible for evaluating user requests against defined policies. The Policy engine interprets the rules and regulations set by the organization regarding internet usage, security measures, and compliance standards. It assesses whether specific user requests conform to established policies, making decisions about those requests based on the policies' conditions and parameters.

This component plays a critical role in ensuring that only compliant and safe requests are allowed through the proxy, thereby helping to mitigate risks and enforce security practices. By effectively managing and enforcing policies, the Policy engine contributes to organizational governance and helps maintain the integrity of network resources.

While other components such as the proxy service, URL filtering engine, and authentication module serve important functions—like processing and directing traffic, filtering web content, and verifying user identities—they do not directly assess policy compliance in the way the Policy engine does. Thus, the choice of the Policy engine as the correct answer aligns with its designated function within the architecture of the ProxySG system.