What term is used for a physical barrier designed to control access to a secure area?

The term "security perimeter" refers to the physical boundary established to protect a secure area and control access to it. This includes various barriers such as walls, fences, or other structures designed to prevent unauthorized entry and ensure that only authorized personnel can access sensitive areas.

A security perimeter effectively defines the area that needs protection and is often complemented by additional security measures such as surveillance, lighting, and security personnel to enforce access control. The concept emphasizes a comprehensive approach to physical security by establishing a clear and defendable border around the assets or areas requiring protection.

While other choices like mantrap, checkpoint, and access gate also pertain to access control, they are more specific components of a broader security strategy. A mantrap is an enclosure designed to control entry and exit, a checkpoint is a designated area for inspection of individuals, and an access gate is simply an entry point that may or may not be secure. Together, they function within the security perimeter but do not encapsulate the entire barrier's purpose and importance.