Final answer:
To prevent tailgating in secure server rooms, the use of mantraps is the best solution. Mantraps restrict access to a controlled space, permitting only one individual to enter or exit at a time, thus effectively preventing unauthorized entry alongside authorized users.
Step-by-step explanation:
The best solution to alleviate the problem of third parties tailgating authorized users during entry to secure server rooms is the use of mantraps. Mantraps are security devices that control two interlocking doors to a small space, where the first door must close before the second opens. This system ensures that only one person can pass through at a time, preventing unauthorized individuals from following someone with authorized access.
While retinal scanners, door locks, and smart card badges provide levels of security, they do not directly prevent another person from following an authorized individual through a door before it closes. Mantraps are specifically designed to address the issue of tailgating. It is important that whatever security measure is chosen, it is implemented alongside a broader security protocol that includes regular staff training on security awareness.