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Difficulty: HardPhysical Security Controls and Environmental Measures

An enterprise network engineer is designing a physical connectivity architecture between two secure server rooms located on separate floors of a shared multi-tenant commercial facility. High-throughput fiber optic cabling must pass through unmonitored building maintenance risers accessible to third-party facility personnel. The security policy requires real-time automated alerts if physical tampering, unauthorized bending, or physical tapping of the conduit pathway occurs. Which physical security control should the engineer implement to meet this requirement?

  1. An Alarmed Protected Distribution System (PDS) utilizing continuous optical fiber monitoring along the conduit pathwayAnswer
  2. B
    A Hardened Protected Distribution System utilizing permanently sealed metallic conduit inspected during scheduled physical audits
  3. C
    A biometric mantrap deployed at the entrance of each floor's telecommunications enclosure
  4. D
    A high-precision cable continuity tester connected permanently at both fiber patch panel terminations

Answer

An Alarmed Protected Distribution System (PDS) utilizing continuous optical fiber monitoring along the conduit pathway
An Alarmed Protected Distribution System (PDS) is specifically designed to protect unencrypted optical and copper communication lines passing through un-monitored or shared spaces. It employs continuous optical fiber sensing or electronic carrier monitoring to detect physical stress, conduit vibration, or micro-bending caused by unauthorized tapping attempts, instantly sending real-time alerts to network operations.

Step-by-Step Solution

1
Analyze the physical security requirement
Identified the need for continuous, real-time automated detection of physical tampering or tapping along fiber runs passing through untrusted, shared building infrastructure.
The requirement specifically mandates immediate automated notification rather than delayed manual detection or perimeter access restriction.
2
Evaluate candidate physical security mechanisms against pathway constraints
Differentiated between access control (mantraps), passive physical encasement (Hardened PDS), manual testing utilities (continuity testers), and active sensor monitoring (Alarmed PDS).
Hardened PDS requires physical locks and visual inspections, while Alarmed PDS integrates optical/carrier monitoring to instantly alert administrators to physical disturbance or micro-bending.
3
Select the control that fulfills both real-time alerting and physical pathway protection
Determined that an Alarmed Protected Distribution System (PDS) is the standard physical security control specified for high-security physical link monitoring.
Alarmed PDS continuously measures light properties or acoustic changes inside conduit runs, satisfying all enterprise security policy mandates.

Key Concept

Protected Distribution System (PDS) and Physical Cable Pathway Security
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Topics

Physical Security Controls and Environmental Measures

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