Access Control Types
As previously stated, access control types (administrative, physical, and technical) work at different levels, but different levels of what? They work together at different levels within their own categories. A security guard is a type of control used to scare off attackers and ensure that only authorized personnel enter a building. If an intruder gets around the security guard in some manner, he could be faced with motion detectors, locks on doors, and alarms. These layers are depicted in Figure 4-21.
Figure 4-21. Security should be implemented in layers, which provides several barriers to attackers.
Each control works ...