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Quick Answer
The answer is to compare the outbound traffic against known threat intelligence feeds, check the server’s process list and running services, and review recent DNS logs. These three actions are effective because they directly validate the anomaly by correlating the unusual outbound traffic with known malicious indicators, identifying the source process generating the traffic, and tracing the destination through DNS queries to uncover potential command-and-control channels. On the CompTIA CySA+ CS0-003 exam, this scenario tests your ability to apply the threat hunting methodology—specifically the validation and response phase—where you must distinguish between passive observation and active investigation. A common trap is to immediately block the IP address without first validating the context, which could disrupt legitimate services. Remember the mnemonic “PID, DNS, Intel” to recall that you must check the Process ID, review DNS logs, and cross-reference threat Intelligence before taking action.
CS0-003 Security Operations Practice Question
This CS0-003 practice question tests your understanding of security operations. 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.
During a threat hunting exercise, a security analyst discovers unusual outbound traffic from a server that typically only communicates internally. Which three of the following are effective actions to validate and respond to this finding? (Choose three.)
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
✓
Check the server’s process list and running services for unknown or suspicious processes.
Checking the server’s process list and running services (Option 1) is effective because it directly identifies any unauthorized or malicious processes that may be generating the unusual outbound traffic. Reviewing recent DNS logs (Option 3) helps correlate the outbound traffic with domain queries, revealing potential command-and-control (C2) destinations. Comparing outbound traffic against threat intelligence feeds (Option 5) validates whether the destination IPs or domains are known malicious indicators, providing context for the anomaly.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the distinction between validation/response actions and premature containment or remediation steps; candidates may incorrectly choose immediate blocking or reimaging because they confuse incident response phases (e.g., skipping analysis and jumping to eradication).
Detailed technical explanation
How to think about this question
In threat hunting, process list analysis often involves checking for unusual parent-child process relationships (e.g., svchost.exe spawning cmd.exe) or processes running from non-standard directories (e.g., %TEMP% or %APPDATA%). DNS logs are critical because many malware families use DNS tunneling or DGA (Domain Generation Algorithm) to evade IP-based blocklists; reviewing NXDOMAIN responses or high query volumes can reveal beaconing behavior. Threat intelligence feeds (e.g., MISP, AlienVault OTX) provide reputation scores for IPs and domains, and matching outbound traffic against these feeds can confirm if the server is communicating with known C2 servers or malware distribution sites.
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.
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FAQ
Questions learners often ask
What does this CS0-003 question test?
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: Check the server’s process list and running services for unknown or suspicious processes. — Checking the server’s process list and running services (Option 1) is effective because it directly identifies any unauthorized or malicious processes that may be generating the unusual outbound traffic. Reviewing recent DNS logs (Option 3) helps correlate the outbound traffic with domain queries, revealing potential command-and-control (C2) destinations. Comparing outbound traffic against threat intelligence feeds (Option 5) validates whether the destination IPs or domains are known malicious indicators, providing context for the anomaly.
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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Last reviewed: Jun 30, 2026
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