One at a time, controlled groups - Access control vestibule, Magnetic swipe, RFID, or NFC - Badge reader, CCTV (Closed circuit television) - Video surveillance, Circuit-based Door, window, fence Motion detection  Duress  - Alarm systems, Lock and key Deadbolt - Physical bolt  Electronic - Keyless, PIN Biometric - Hand, fingers or retina  - Door locks, Data center hardware is usually managed by different groups  Racks can be installed together  Enclosed cabinets with locks - Equipment locks, Security guard  ID badge - Guards and access lists, Prevent access  Channel people through a specific access point Identify safety concerns  - Barricades / bollards, Build a perimeter Transparent or opaque Prevent climbing   - Fences,

a+ 1102 2.1 - Physical Security

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