- A
Increase the alert generation threshold
Why wrong: Increasing alerts would make the problem worse.
- B
Replace the IDS with an intrusion prevention system (IPS)
Why wrong: An IPS may still generate false positives and block legitimate traffic.
- C
Disable the IDS until a full review is completed
Why wrong: Disabling removes detection entirely.
- D
Tune the IDS signatures and rules
Tuning reduces false positives by refining detection criteria.
Question 334 of 1,000
Reducing IDS False Positives — Signature Tuning vs Threshold Adjustments
This SSCP practice question tests your understanding of risk identification, monitoring and analysis. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 deployed an intrusion detection system (IDS) that generates numerous false positives. Which approach would best reduce false positives while maintaining detection capability?
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
✓
Tune the IDS signatures and rules
Tuning IDS signatures and rules (option D) directly addresses the root cause of false positives by refining detection patterns to match legitimate traffic more accurately. This approach preserves the IDS's ability to detect genuine threats while eliminating noise, unlike threshold adjustments which can miss low-and-slow attacks.
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.
- ✗
Increase the alert generation threshold
Why it's wrong here
Increasing alerts would make the problem worse.
- ✗
Replace the IDS with an intrusion prevention system (IPS)
Why it's wrong here
An IPS may still generate false positives and block legitimate traffic.
- ✗
Disable the IDS until a full review is completed
Why it's wrong here
Disabling removes detection entirely.
- ✓
Tune the IDS signatures and rules
Why this is correct
Tuning reduces false positives by refining detection criteria.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'increasing the threshold' (option A) with tuning, but threshold adjustments are a blunt instrument that can suppress true positives, whereas signature tuning refines detection granularity without sacrificing sensitivity.
Detailed technical explanation
How to think about this question
IDS signatures can be tuned by adjusting pattern-matching parameters (e.g., regular expressions, protocol decode thresholds) or by enabling context-aware rules that filter based on source/destination IP, port, or application layer data. For example, a signature triggering on HTTP GET requests can be scoped to only alert on specific URI patterns, reducing false positives from benign web crawlers. In real-world deployments, tuning often involves analyzing alert metadata (e.g., Snort's 'sid' and 'rev' fields) and using whitelisting or threshold-based suppression without disabling the underlying detection logic.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SSCP question test?
Risk Identification, Monitoring and Analysis — This question tests Risk Identification, Monitoring and Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Tune the IDS signatures and rules — Tuning IDS signatures and rules (option D) directly addresses the root cause of false positives by refining detection patterns to match legitimate traffic more accurately. This approach preserves the IDS's ability to detect genuine threats while eliminating noise, unlike threshold adjustments which can miss low-and-slow attacks.
What should I do if I get this SSCP question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more ways this is tested on SSCP
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses a SIEM to monitor security events. Recently, they are experiencing false positives from a new IDS rule. Which approach would best reduce false positives while maintaining detection?
hard- A.Disable the rule.
- B.Increase the log review frequency.
- C.Whitelist false positive sources.
- ✓ D.Adjust the rule threshold.
Why D: Adjusting the rule threshold (Option D) is the best approach because it fine-tunes the sensitivity of the IDS rule to reduce false positives without completely disabling detection. By raising the threshold (e.g., increasing the number of matching packets or the time window), the SIEM will only generate an alert when the rule's criteria are met more persistently, filtering out noise while still capturing genuine threats. This maintains the rule's detection capability for actual attacks that exceed the adjusted threshold.
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Last reviewed: Jun 25, 2026
This SSCP practice question is part of Courseiva's free ISC2 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 SSCP exam.
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