Quick Answer
The answer is LiME (Linux Memory Extractor), the most appropriate tool for acquiring a forensic memory dump from a Linux server without altering system state. LiME loads as a kernel module to capture volatile memory with minimal footprint, exporting the dump directly to a file or over the network, which avoids writing to the target disk and preserves evidence integrity. On the CompTIA SecurityX CAS-004 exam, this question tests your ability to distinguish acquisition tools from analysis tools—a common trap is confusing Volatility (which analyzes dumps) with LiME (which acquires them), or selecting dd, which is for disk imaging, not memory. Remember the mnemonic: “LiME Loads Memory, Extracts cleanly”—if the task is live acquisition from a Linux host, LiME is your go-to.
This CAS-004 practice question tests your understanding of security engineering. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 security incident, a forensic analyst needs to acquire a memory dump from a Linux server without altering the system state. Which tool is most appropriate for this task?
Volatility framework
Why wrong: Volatility is for analyzing memory dumps, not for acquiring them.
LiME (Linux Memory Extractor)
LiME captures memory safely via a kernel module, preserving forensic integrity.
dd if=/dev/mem of=mem.dump
Why wrong: /dev/mem may not provide full physical memory and can crash the system.
memdump utility
Why wrong: memdump is a tool for dumping memory but may not be available on all systems and can be intrusive.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
LiME (Linux Memory Extractor)
LiME (Linux Memory Extractor) is designed to acquire memory dumps with minimal impact, loading as a kernel module and exporting memory to a file or network. dd is for disk, memdump is limited, and Volatility is for analysis, not acquisition.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Volatility framework
Why it's wrong here
Volatility is for analyzing memory dumps, not for acquiring them.
LiME (Linux Memory Extractor)
Why this is correct
LiME captures memory safely via a kernel module, preserving forensic integrity.
Related concept
Read the scenario before looking for a memorised answer.
dd if=/dev/mem of=mem.dump
Why it's wrong here
/dev/mem may not provide full physical memory and can crash the system.
memdump utility
Why it's wrong here
memdump is a tool for dumping memory but may not be available on all systems and can be intrusive.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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.
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FAQ
Security Engineering — This question tests Security Engineering — Read the scenario before looking for a memorised answer..
The correct answer is: LiME (Linux Memory Extractor) — LiME (Linux Memory Extractor) is designed to acquire memory dumps with minimal impact, loading as a kernel module and exporting memory to a file or network. dd is for disk, memdump is limited, and Volatility is for analysis, not acquisition.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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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