The answer is DNS query logs, as they are the least useful data source for lateral movement detection. While DNS logs reveal domain resolution requests, they lack the direct evidence of host-to-host interaction that lateral movement requires, such as remote logins, process connections, or authentication events. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to prioritize data sources based on their relevance to attack chain phases—specifically, lateral movement relies on observing actual system access or credential reuse, not name resolution. A common trap is overvaluing DNS logs because attackers often use DNS for command-and-control, but that is exfiltration, not lateral movement. For a memory tip, remember: “DNS tells you where they look, not where they go.”
CAS-004 Security Operations Practice Question
This CAS-004 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 threat hunter wants to identify potential lateral movement within the network. Which data source is LEAST useful for this purpose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
DNS query logs
Option B is correct because DNS logs primarily show domain resolution requests, which may not directly indicate lateral movement. Option A shows remote logins. Option C shows processes connecting to other systems. Option D shows authentication events.
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.
✗
Windows Event ID 4624 (Logon) from domain controllers
Why it's wrong here
Successful logins from different systems can indicate lateral movement.
✗
Windows Event ID 4648 (Logon with explicit credentials)
Why it's wrong here
This event shows when a user runs a process using different credentials, common in lateral movement.
✗
Windows Event ID 5140 (File share accessed)
Why it's wrong here
File share access from different systems can indicate lateral movement.
✓
DNS query logs
Why this is correct
DNS logs show name resolution but not lateral movement itself.
Clue confirmation
The clue word "least" 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
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
This event shows when a user runs a process using different credentials, common in lateral movement.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: DNS query logs — Option B is correct because DNS logs primarily show domain resolution requests, which may not directly indicate lateral movement. Option A shows remote logins. Option C shows processes connecting to other systems. Option D shows authentication events.
What should I do if I get this CAS-004 question wrong?
Identify which CAS-004 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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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