Partial IDS failure is defined as?

Partial IDS failure is defined as?

• A. The intruder can cross only one sensor providing a detection capability without being detected, at areas where two or more sensors for a line of detection at the boundary
• B. All sensors fail
• C. The system is fully operational
• D. Only alarms with audible noise

Answer: (A)

Partial IDS failure happens when part of the perimeter sensing network loses its redundancy, creating a gap in detection. When a boundary is designed so that a line of detection requires more than one sensor to trigger, losing one sensor means only a single sensor remains to monitor that boundary segment. An intruder can then cross through that area without triggering enough alarms, because the remaining sensor isn’t providing full coverage. The described situation—that an intruder can pass through using only one sensor along a boundary line that normally needs two or more sensors—embodies this reduced detection capability. Other options describe complete failure, full operation, or alarms that don’t relate to sensor coverage, which don’t capture the partial loss of detection along a multi-sensor boundary.

Partial IDS failure happens when part of the perimeter sensing network loses its redundancy, creating a gap in detection. When a boundary is designed so that a line of detection requires more than one sensor to trigger, losing one sensor means only a single sensor remains to monitor that boundary segment. An intruder can then cross through that area without triggering enough alarms, because the remaining sensor isn’t providing full coverage. The described situation—that an intruder can pass through using only one sensor along a boundary line that normally needs two or more sensors—embodies this reduced detection capability. Other options describe complete failure, full operation, or alarms that don’t relate to sensor coverage, which don’t capture the partial loss of detection along a multi-sensor boundary.