The network administrator wants to strengthen physical security in the organization. Specifically, to implement a solution stopping people from entering certain restricted zones without proper credentials. Which of following physical security measures should the administrator use?

A mantrap is a physical access control system designed to manage entry into a secure area by allowing only one person to pass through at a time after successful authentication. It consists of two interlocking doors where the first must close before the second can open. This design effectively prevents unauthorized individuals, including those attempting to tailgate, from entering restricted zones without presenting valid credentials, directly addressing the administrator's requirement.

A. Bollards are posts used to prevent vehicle access to a specific area; they do not verify personnel credentials for entry.
B. A fence establishes a perimeter and acts as a deterrent but does not actively stop and authenticate individuals at an entry point.
C. Video surveillance is a detective control that records events for later review; it does not physically prevent unauthorized entry.

1. National Institute of Standards and Technology (NIST). (2020). Special Publication (SP) 800-53, Revision 5: Security and Privacy Controls for Information Systems and Organizations. Section PE-3, "Physical Access Control," discusses controls like mantraps for managing entry. (p. 298). https://doi.org/10.6028/NIST.SP.800-53r5

2. Garcia, M. L. (2007). The Design and Evaluation of Physical Protection Systems. Butterworth-Heinemann. Chapter 5, "Access Control," details the function of mantraps in high-security environments.