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CRISC Practice Question: A control monitoring system generates an alert…
A control monitoring system generates an alert when transaction volumes exceed 10,000 per hour. Recently, the system has been generating false positives during peak business hours due to legitimate seasonal spikes. Which of the following is the BEST approach to reduce false positives while maintaining effective monitoring?
⚠ Common exam trap
The trap here is that candidates mistakenly choose a static threshold increase (Option D) thinking it solves false positives, but CRISC expects adaptive controls that align with risk-based monitoring principles, not rigid rule changes.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply dynamic thresholding that adjusts based on historical baseline
Dynamic thresholding uses historical baselines to automatically adjust alerting thresholds in response to predictable patterns, such as seasonal spikes. This approach reduces false positives during peak hours while preserving the system's ability to detect anomalous transaction volumes that deviate from the learned baseline, ensuring effective monitoring without manual intervention.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable the alerting during peak hours
Why it's wrong here
Disabling alerts removes monitoring during high-risk periods.
- ✗
Implement manual review of all alerts during peak hours
Why it's wrong here
Manual review is not scalable and does not reduce false positives.
- ✓
Apply dynamic thresholding that adjusts based on historical baseline
Why this is correct
Dynamic thresholding adapts to regular patterns, reducing false positives.
- ✗
Increase the alert threshold to 15,000 transactions per hour
Why it's wrong here
Raising threshold may miss true anomalies during off-peak times.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CRISC practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CRISC exam.