What defines perimeters and ensures only authorized personnel are permitted access?

Active barrier systems are designed specifically to control and manage access to an area by allowing entry only to authorized personnel. These systems can include gates, turnstiles, or access control systems that actively monitor and restrict entry points. By implementing these measures, organizations ensure that individuals attempting to enter a secured area are thoroughly verified, thus enhancing the overall security posture.

In contrast, passive barrier systems, while they can deter unauthorized access (e.g., fences or walls), do not actively control entry; they are designed to resist intrusion but rely on the absence of security breaches rather than direct control over who can enter. Emergency response protocols are critical for managing incidents once they occur, rather than preventing unauthorized access in the first place. Intrusion prevention measures focus more on detecting and responding to breaches after they happen rather than defining controlled access points actively.