easyMultiple ChoiceObjective-mapped
CRISC Practice Question: Refer to the exhibit
Exhibit
2024-03-01 10:15:23 ERROR [SIEM] Correlation rule 'Brute_Force_SSH' triggered 1500 times in the last hour. Source IPs: 10.0.0.34, 10.0.0.56, 10.0.0.78. Investigation reveals these are internal monitoring servers.
Refer to the exhibit. A SIEM correlation rule 'Brute_Force_SSH' has fired excessively due to traffic from internal monitoring servers. What is the BEST course of action?
⚠ Common exam trap
Test-takers frequently confuse 'tuning' with 'disabling' or 'threshold adjustment', failing to recognize that a targeted exception is the most precise and least risky way to handle known false positives from trusted internal sources.
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
✓
Add an exception in the rule to exclude internal monitoring server IPs.
The excessive alerts are caused by legitimate traffic from internal monitoring servers, not by an actual brute-force attack. Adding an exception to exclude these known IP addresses in the SIEM correlation rule preserves the rule's detection capability for real threats while eliminating the false positives. This is a standard tuning practice for SIEM rules to maintain operational efficiency without disabling security controls.
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 correlation rule to stop false alerts.
Why it's wrong here
Removes detection capability.
- ✗
Increase the threshold to reduce false positives.
Why it's wrong here
May miss real attacks.
- ✗
Investigate the monitoring servers for compromise.
Why it's wrong here
No evidence of compromise; they are legitimate.
- ✓
Add an exception in the rule to exclude internal monitoring server IPs.
Why this is correct
Targeted tuning reduces false positives.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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