Name one passive security control measure.

A passive security control measure is one that is designed to prevent unauthorized access or to protect assets without requiring active intervention at the moment. Physical barriers such as walls or locked doors serve as a fundamental component in security architecture by effectively restricting access to designated areas and protecting sensitive information or valuable assets. They provide a physical deterrent that can enhance overall security by making it more difficult for unauthorized individuals to gain entry.

In contrast, security cameras and alarm systems are considered active measures because they rely on electronic means to monitor and respond to threats or breaches. These systems require ongoing monitoring and may generate alerts but do not inherently block access. Similarly, security personnel patrols are an active security measure, as they involve human intervention and real-time responses to security incidents. Therefore, the choice of physical barriers reflects the essence of passive security, focusing on prevention through physical means rather than through active monitoring or response.