In the three-zone model, which zone focuses on preventing people from entering restricted areas?

• A. Exclusion
• B. Access Control
• C. Containment
• D. Protection

Answer: (A)

The key idea here is how security measures are organized by how far they protect the restricted space. The outermost layer is designed to keep unauthorized people from even getting close to the area in question—that is Exclusion. It uses barriers, gates, fences, signage, lighting, alarms, and security personnel to block entry before it happens. Access control is about deciding who is allowed to enter and managing credentials, but the explicit boundary that prevents entry is Exclusion. Containment, by contrast, deals with stopping or limiting movement after someone has already entered, while Protection focuses on safeguarding people and assets inside the secure area. So the zone whose purpose is to prevent entry from occurring in the first place is Exclusion.