29 Hour Joint Knowledge Online (JKO) Practice Test

The main idea is protecting a facility through physical boundary controls. A perimeter fence and controlled entry points establish a tangible barrier and a gatekeeping point that deter and regulate who can approach and enter the site. This foundational measure stops unauthorized access before someone reaches the building, making it a core layer in physical security. While cameras help monitor and alert, and employee background checks address personnel reliability, those approaches don’t prevent entry at the site itself. Firewalls and antivirus protect digital systems, not the physical premises.