What triggers Policy Evaluation within a network?

Policy Evaluation within a network is primarily triggered by significant events that signal a need to reassess compliance with established security policies. An Admission Event, such as a device connecting to the network, acts as a catalyst for policy evaluation because it is crucial to determine if the incoming device meets the required security standards before granting access. Additionally, the expiration of a Policy Recheck Timer serves as a scheduled opportunity to reassess compliance, ensuring that devices continue to adhere to security policies over time.

This dual-trigger mechanism not only focuses on initial access conditions but also maintains ongoing compliance, adapting to changes that may occur in the network environment. This is vital in dynamic network scenarios where devices may change state or status, and continuous evaluation helps ensure security is upheld consistently. In contrast, other options either address different operational factors or introduce elements that do not directly trigger policy evaluations, emphasizing the specificity of the correct choice.