The answer is to create allowlists for known legitimate sources, such as partner IP ranges and internal scanners, in the SIEM correlation rules. This is the best course of action because it directly addresses the root cause of the false positives—trusted entities triggering alerts—without weakening detection for unknown threats. By allowlisting pre-vetted sources, the SIEM suppresses noise from legitimate web crawling and scanning activities while preserving correlation sensitivity for malicious traffic, effectively reducing SIEM false positives by allowlisting trusted sources. On the CompTIA SecurityX CAS-004 exam, this scenario tests your ability to balance security monitoring with operational efficiency; a common trap is to suggest disabling the correlation rules entirely or increasing alert thresholds, which would risk missing real attacks. Remember the mnemonic "ALERT: Allowlist Legitimate Entities, Retain Threat detection"—this reinforces that allowlisting fine-tunes detection rather than blunting it.
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 large enterprise has deployed a security information and event management (SIEM) system that ingests logs from all critical servers, network devices, and endpoints. The SIEM is configured to correlate events and generate alerts for suspicious activities. Recently, the SOC team has been overwhelmed by a high volume of false positive alerts, particularly from the web server farm. The false positives are mainly triggered by legitimate web crawling and scanning activities from partners and internal tools. The SOC manager wants to reduce false positives without missing real threats. As the security architect, you are asked to recommend a solution. Which of the following is the BEST course of action?
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
✓
Create allowlists for known legitimate sources (e.g., partner IP ranges, internal scanners) in the SIEM correlation rules.
Option D is correct because creating allowlists for known legitimate sources (e.g., partner IP ranges, internal scanners) in the SIEM correlation rules directly addresses the root cause: false positives from trusted entities. This approach preserves detection sensitivity for unknown or malicious sources while suppressing alerts from pre-vetted IPs, reducing alert fatigue without compromising security coverage.
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 event threshold for web server alerts to reduce sensitivity.
Why it's wrong here
May cause real attacks to be missed if they occur below the new threshold.
✗
Disable logging of successful requests on the web servers to reduce log volume.
Why it's wrong here
Would remove visibility and is too drastic.
✗
Tune the SIEM to use more aggressive deduplication and aggregation globally.
Why it's wrong here
May weaken detection for other use cases.
✓
Create allowlists for known legitimate sources (e.g., partner IP ranges, internal scanners) in the SIEM correlation rules.
Why this is correct
Directly reduces false positives while maintaining detection for unknown sources.
Clue confirmation
The clue word "best" in the question point toward this answer.
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 reducing log volume (Option B) with reducing false positives, or assume that global tuning (Options A and C) is safer than targeted allowlisting, when in fact allowlisting preserves detection fidelity for unknown threats.
Detailed technical explanation
How to think about this question
SIEM correlation rules typically use conditional logic (e.g., 'if source IP NOT IN [allowlist] AND event ID = 1234 THEN alert'). By implementing allowlists at the correlation engine level, the SIEM can still ingest and store all logs for forensic analysis while suppressing alert generation for trusted sources. In practice, this is often combined with threat intelligence feeds to dynamically update the allowlist, ensuring that only verified partner IPs and internal scanner ranges are excluded from alerting.
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 practitioner preparing for the CAS-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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: Create allowlists for known legitimate sources (e.g., partner IP ranges, internal scanners) in the SIEM correlation rules. — Option D is correct because creating allowlists for known legitimate sources (e.g., partner IP ranges, internal scanners) in the SIEM correlation rules directly addresses the root cause: false positives from trusted entities. This approach preserves detection sensitivity for unknown or malicious sources while suppressing alerts from pre-vetted IPs, reducing alert fatigue without compromising security coverage.
What should I do if I get this CAS-004 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.
About these practice questions
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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 security engineer is configuring a SIEM and wants to reduce false positives while ensuring that real attacks are detected. Which of the following approaches would best achieve this balance?
medium
A.Aggregate all logs from all sources and create a single correlation rule for each attack type.
B.Use the default correlation rules provided by the SIEM vendor without modification.
C.Block all traffic from external IP addresses that are not on the organization's whitelist.
✓ D.Tune correlation rules based on the organization's asset inventory, network architecture, and threat intelligence.
Why D: Option D is correct because tuning correlation rules to the organization's specific asset inventory, network architecture, and threat intelligence directly reduces false positives by filtering out irrelevant events while ensuring that real attacks against known assets are detected. This approach leverages contextual knowledge to adjust thresholds, exclude noise, and prioritize alerts that match the actual attack surface, achieving the desired balance between sensitivity and specificity.
Last reviewed: Jun 11, 2026
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This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
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