# Physical Security Operations (Perimeter/Facility/DC)
One-sentence definition: Day-to-day controls that protect people, facilities, and equipment.
## Key Facts
- Perimeter: fencing, lighting, guards, CCTV, vehicle barriers.
- Facility: badge + visitor control, mantraps, escort rules.
- DC rooms: locks, cages, environmental sensors, access logs.
- Regular drills and maintenance of cameras/alarms.
- **Verify:** check official (ISC)² CBK and current exam outline.
## Exam Relevance
- Recognize layered physical defenses and procedures.
**Mnemonic:** “**Perimeter → Facility → Room**.”
## Mini Scenario
Q: Tailgating frequent—countermeasure?
A: Mantrap/turnstiles + awareness + enforcement.
## Revision Checklist
- Three layers.
- Visitor process.
- Maintenance need.
## Related
[[Fire Suppression and Safety in Data Centers]] · [[Power UPS Generators and Environmental Controls]] · [[Data Destruction and Media Sanitization]] · [[Social Engineering Assessments]] · [[Business Continuity Operations and Crisis Communications]] · [[Domain 7 - Index]]