CS0-003 Reporting and Communication Practice Question
This CS0-003 practice question tests your understanding of reporting and communication. 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.
Refer to the exhibit. A security analyst is reviewing SIEM logs and notices repeated entries from the same source IP. Which of the following actions should the analyst take NEXT?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the baseline behavior of the source IP
Option B is correct because the first step in incident response is to validate whether the activity is malicious by comparing it against a known baseline. Repeated entries from the same source IP could indicate a benign automated process (e.g., a legitimate monitoring tool or scheduled scan) rather than an attack. Checking the baseline behavior prevents unnecessary disruption and aligns with the NIST SP 800-61 incident response framework's emphasis on identification and analysis before containment.
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.
✗
Immediately block the source IP at the firewall
Why it's wrong here
Blocking without verification could disrupt legitimate services; investigation is needed first.
✓
Check the baseline behavior of the source IP
Why this is correct
Comparing against baseline helps determine if the activity is truly anomalous and justifies further action.
Related concept
Read the scenario before looking for a memorised answer.
✗
Update the signature database
Why it's wrong here
The signature already triggered; updating is not immediately relevant to this specific alert.
✗
Isolate the affected system for forensic analysis
Why it's wrong here
Isolation may be necessary after confirming malicious activity, but not as the first step.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the candidate's ability to resist the impulse to immediately block or contain, emphasizing that verification against a baseline is the mandatory next step before any action in the incident response process.
Detailed technical explanation
How to think about this question
In SIEM environments, baseline behavior is often established using statistical models (e.g., time-series analysis of connection frequency) or rule-based thresholds (e.g., more than 100 connections per minute from a single IP). The analyst should query the SIEM for historical data on the source IP, checking for patterns like regular intervals (suggesting a cron job) or correlation with known asset inventories. Real-world scenarios include mistaking a legitimate load balancer health check or a domain controller's replication traffic for an attack, which can be avoided by reviewing NetFlow logs or DNS query logs alongside the SIEM entry.
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 team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CS0-003 question in full detail.
Reporting and Communication — This question tests Reporting and Communication — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the baseline behavior of the source IP — Option B is correct because the first step in incident response is to validate whether the activity is malicious by comparing it against a known baseline. Repeated entries from the same source IP could indicate a benign automated process (e.g., a legitimate monitoring tool or scheduled scan) rather than an attack. Checking the baseline behavior prevents unnecessary disruption and aligns with the NIST SP 800-61 incident response framework's emphasis on identification and analysis before containment.
What should I do if I get this CS0-003 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.
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Question Discussion
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