Network Defense Essentials (NDE) Practice Exam

Which physical security barrier allows entry to only one person at a time and may hinder evacuation during emergencies?

1. Turnstiles

2. Fences

3. Bollards

4. Security booths

The correct answer is: Turnstiles

Turnstiles are designed to allow entry to only one person at a time, typically functioning as a rotating gate that permits access in a controlled manner. This mechanism enhances security by preventing unauthorized entry and ensuring that individuals pass through in an orderly fashion. In environments where monitoring individual access is crucial, such as in secured buildings or transport facilities, turnstiles are particularly effective. However, this one-at-a-time entry mechanism can pose a challenge during emergencies. In a situation requiring rapid evacuation, the turnstile's design may significantly slow down the flow of individuals leaving a space, potentially leading to congestion and increased risk. Emergency response protocols often need to consider alternative exits or override features for turnstiles to ensure a swift evacuation when necessary. Fences, bollards, and security booths serve different security purposes, including perimeter protection and access control but do not inherently limit passage to one individual at a time in the manner that turnstiles do.