The answer is storing evidence in a secure, access-controlled environment, as this directly preserves the chain of custody and prevents unauthorized tampering. This practice is essential because digital evidence is inherently fragile; any physical or logical access without strict logging can compromise its admissibility by breaking the forensic soundness required in legal proceedings. On the Computer Hacking Forensic Investigator CHFI exam, this concept tests your understanding of lab security protocols, often appearing alongside questions about write-blockers and forensic imaging tools like FTK Imager. A common trap is confusing physical security with logical acquisition controls—remember that while write-blockers protect the source drive during imaging, the lab’s access control safeguards the evidence before and after analysis. For a quick memory tip, think “Lock, Log, and Limit” to recall that secure storage, audit trails, and restricted access are the triad of evidence integrity.
CHFI Computer Forensics Lab Practice Question
This CHFI practice question tests your understanding of computer forensics lab. 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.
A forensic examiner is setting up a new lab. Which THREE of the following practices are essential for maintaining the integrity of digital evidence?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use write-blocking devices when acquiring data from suspect drives.
Option C is correct because write-blocking devices (hardware or software) prevent any write operations to the source drive during acquisition, ensuring the original data remains unaltered. This is fundamental to maintaining the integrity of digital evidence, as any modification could render the evidence inadmissible in court. Forensic imaging tools like FTK Imager or dd rely on write-blockers to guarantee a bit-for-bit copy without contaminating the source.
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.
✗
Perform regular backups of the forensic workstation’s operating system.
Why it's wrong here
Incorrect: While good practice, this does not directly affect evidence integrity.
✗
Disable write-blocking when imaging drives to improve speed.
Why it's wrong here
Incorrect: Disabling write-blocking can alter evidence and is not a best practice.
✓
Use write-blocking devices when acquiring data from suspect drives.
Why this is correct
Correct: Write-blockers prevent alteration of original evidence.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement a chain-of-custody procedure for all evidence.
Why this is correct
Correct: Chain-of-custody is fundamental to evidence integrity.
Related concept
Read the scenario before looking for a memorised answer.
✓
Store evidence in a secure, access-controlled environment.
Why this is correct
Correct: Secure storage prevents tampering or loss.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that operational convenience (like faster imaging) can ever override the foundational forensic requirement of write protection, leading candidates to incorrectly choose Option B.
Detailed technical explanation
How to think about this question
Write-blocking devices intercept SCSI or ATA commands at the hardware level, specifically blocking write commands (e.g., WRITE10, WRITE16) while allowing read commands (e.g., READ10, READ16) to pass through. In a real-world scenario, failing to use a write-blocker on a drive with a failing filesystem could cause the OS to automatically write repair metadata, altering timestamps and file system structures, which would be flagged during hash verification (e.g., SHA-256 mismatch).
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Computer Forensics Lab — This question tests Computer Forensics Lab — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use write-blocking devices when acquiring data from suspect drives. — Option C is correct because write-blocking devices (hardware or software) prevent any write operations to the source drive during acquisition, ensuring the original data remains unaltered. This is fundamental to maintaining the integrity of digital evidence, as any modification could render the evidence inadmissible in court. Forensic imaging tools like FTK Imager or dd rely on write-blockers to guarantee a bit-for-bit copy without contaminating the source.
What should I do if I get this CHFI 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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