正解:D
setting up IP cameras to monitor key infrastructure. Physical access control protects buildings, rooms, closets, racks, and infrastructure from unauthorized physical interaction. IP cameras monitoring key infrastructure are a physical security control because they deter, detect, and document access to protected spaces. Console passwords and enable passwords are logical access controls on devices, not physical controls. Backing up syslogs is an operational logging and recovery practice. Cisco CCNA 200-301 v1.1 Security Fundamentals separates physical controls from administrative and technical controls because all three are needed in a secure network. A router with strong passwords is still exposed if an attacker can physically reach the console cable or remove hardware. The corrected answer is setting up IP cameras to monitor key infrastructure.