The correct answer is to tune the WAF’s detection rules based on the application’s normal traffic profile, because this directly addresses the root cause of the SIEM false positive reduction WAF tuning challenge. By refining the WAF’s rules to match the application’s baseline behavior, you filter out benign requests that merely resemble SQL injection patterns, preserving detection of genuine threats while eliminating noise. On the ISC2 Certified in Cybersecurity CC exam, this scenario tests your understanding that a SIEM is only as good as the data it receives—overly broad WAF rules flood it with false positives, and the fix is at the source, not in the SIEM. A common trap is choosing to suppress alerts in the SIEM, which hides real attacks, or disabling the WAF rule entirely, which removes protection. Remember the memory tip: “Tune the source, not the sink”—adjust the WAF where the traffic is inspected, not the SIEM where it’s logged.
ISC2 CC Security Operations Practice Question
This CC practice question tests your understanding of security operations. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has implemented a security information and event management (SIEM) system. The SOC team notices that the SIEM is generating a high volume of false positive alerts from a specific web application firewall (WAF). The WAF logs show many requests with SQL injection patterns, but the application is not vulnerable. Which of the following actions would BEST reduce false positives without compromising security?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Tune the WAF's detection rules based on the application's normal traffic profile
Option C is correct because tuning the WAF's detection rules to match the application's normal traffic profile reduces false positives by filtering out benign requests that resemble SQL injection patterns. This approach maintains security by still detecting actual attacks, unlike simply suppressing alerts or disabling detection. The SIEM should correlate WAF alerts with application context, but the root cause is the WAF's overly broad rules, which need refinement.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Create a SIEM rule to suppress alerts from that WAF
Why it's wrong here
Suppression hides the issue and could mask real threats.
✗
Increase the alert threshold in the WAF to reduce sensitivity
Why it's wrong here
This could cause legitimate attacks to be missed.
✓
Tune the WAF's detection rules based on the application's normal traffic profile
Why this is correct
Tuning reduces false positives by filtering out benign patterns that resemble attacks.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable SQL injection detection in the WAF for that application
Why it's wrong here
This removes protection against SQL injection attacks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that suppressing alerts or disabling detection is acceptable, but the correct approach is to tune detection rules to balance security and operational efficiency.
Detailed technical explanation
How to think about this question
WAFs like ModSecurity or AWS WAF use signature-based and anomaly-based detection; tuning involves adjusting rule severity, excluding known benign patterns (e.g., parameterized queries), or creating custom rules via positive security models. In practice, a false positive spike often occurs when a WAF's default OWASP Core Rule Set (CRS) flags legitimate input containing SQL keywords (e.g., 'SELECT' in a search field). Tuning should involve analyzing the WAF's logs to identify the specific rule IDs triggering false positives and either disabling those rules or adding exceptions for trusted parameters.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CC question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Tune the WAF's detection rules based on the application's normal traffic profile — Option C is correct because tuning the WAF's detection rules to match the application's normal traffic profile reduces false positives by filtering out benign requests that resemble SQL injection patterns. This approach maintains security by still detecting actual attacks, unlike simply suppressing alerts or disabling detection. The SIEM should correlate WAF alerts with application context, but the root cause is the WAF's overly broad rules, which need refinement.
What should I do if I get this CC question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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