What is the purpose of perimeter controls?

• A. Perimeter controls are entry and exit inspections that deter and detect the introduction or removal of classified information from a facility without proper authority.
• B. Perimeter controls are used to train employees.
• C. Perimeter controls enforce dress code.
• D. Perimeter controls monitor parking.

Answer: (A)

Perimeter controls are about preventing unauthorized access and the unauthorized introduction or removal of classified information by screening who and what crosses the facility boundary. They set up the outer boundary of protection, using measures like entry and exit inspections, credential verification, and screening of people, packages, and vehicles at controlled points. This is why the function described—deterring and detecting attempts to bring in or take out classified information without proper authority—is exactly what perimeter controls are for. Other activities like employee training, dress code, or parking monitoring are important security practices, but they operate at different layers and are not the primary purpose of perimeter controls.