Which set of activities can verify the reliability of perimeter security controls?

• A. Camera checks, visual inspections, and maintenance log reviews.
• B. Only visual inspection of fences.
• C. Only testing of alarm panels.
• D. No testing required.

Answer: (A)

Reliability of perimeter security controls is verified through a combination of checks that cover detection equipment, physical integrity, and ongoing maintenance documentation.

Camera checks ensure devices are powered, recording, and properly positioned, with functioning storage and synchronized timing so incidents are captured and retrievable. Visual inspections verify the actual physical barriers—fences, gates, locks, and access points—for damage, wear, or tampering, ensuring the barrier works as designed. Maintenance log reviews confirm that preventive maintenance occurs on schedule and that any repairs or recurring issues are documented and addressed, providing accountability and a traceable history.

Relying on only one activity—such as visual inspection alone or alarm testing alone—can miss issues in other components or gaps in maintenance. No testing at all fails to provide evidence that the controls are functioning, maintained, and capable of detecting and deterring intrusions.