Which of the following security principles most likely requires validation before allowing traffic between systems?

Policy enforcement refers to the implementation of rules and guidelines that dictate how data and resources should be accessed and used. While it is essential for maintaining security, it doesn’t inherently require validation of every traffic request between systems. Instead, it focuses more on adherence to established security policies rather than continuous verification.

Authentication is the process of verifying the identity of a user or system. Although it is a critical component of security, it typically happens at the initial point of access rather than continuously validating every interaction between systems. Therefore, while authentication is important, it does not encompass the ongoing validation aspect that Zero Trust architecture mandates.

Confidentiality focuses on ensuring that information is accessible only to those authorized to have access. While it is a vital aspect of security, it does not directly involve the validation of traffic between systems. Instead, confidentiality is maintained through encryption and access controls rather than active request validation.