Which aspect of physical security is most directly addressed by perimeter security measures?

Perimeter security measures are primarily designed to safeguard a property's boundaries and prevent unauthorized access to the premises. By establishing a clear boundary, such as fences, walls, gates, or surveillance systems, these measures are focused on deterring and detecting potential external threats. In this context, external threats refer to individuals or groups attempting to unlawfully enter a facility with the intent to cause harm, theft, or other malicious activities.

While other options touch on critical components of security management, they do not directly relate to the primary purpose of perimeter security. Internal policies and procedures guide behavior within an organization, while employee training and awareness programs focus on educating staff about security protocols. Incident reporting systems are essential for documenting and responding to security events after they occur. However, perimeter security's primary objective is to create a first line of defense against outside threats, thereby addressing the issue of unauthorized access head-on. This makes the focus on external threats and unauthorized access the most relevant aspect connected to perimeter security measures.