CHFI Computer Forensics Fundamentals and Process Practice Question
This CHFI practice question tests your understanding of computer forensics fundamentals and process. 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.
Which of the following is an example of Locard's Exchange Principle as applied to digital forensics?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A suspect's computer contains log files showing they accessed a server
Locard's Exchange Principle states that every contact leaves a trace. In digital forensics, this translates to the idea that when a system interacts with another, digital artifacts (such as log entries, registry keys, or network connection records) are created. Option A is correct because the log files on the suspect's computer are a direct trace of the contact between the suspect's system and the server, demonstrating the principle in a digital context.
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.
✓
A suspect's computer contains log files showing they accessed a server
Why this is correct
The access leaves traces on the suspect's machine.
Related concept
Read the scenario before looking for a memorised answer.
✗
A hard drive is encrypted and cannot be read
Why it's wrong here
Encryption prevents analysis but does not illustrate the principle.
✗
A firewall blocks all incoming traffic from a specific IP address
Why it's wrong here
This is a security measure, not evidence of contact.
✗
A write blocker prevents data from being written to a drive
Why it's wrong here
This is a tool, not an example of the principle.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that any security tool or data protection mechanism (like encryption or firewalls) is an example of Locard's Exchange Principle, when in fact the principle specifically requires evidence of a transfer or contact trace, not a barrier or lack of access.
Detailed technical explanation
How to think about this question
Locard's Exchange Principle in digital forensics is often demonstrated by artifacts such as Windows Event Logs (e.g., Event ID 4624 for successful logons), browser history files, or network flow records (e.g., NetFlow logs). For instance, when a user accesses a remote server, the client system may log the connection in the Security log or in prefetch files, while the server logs the source IP and user agent. In real-world investigations, this principle is critical for linking a suspect to a specific action, such as proving that a file was downloaded from a cloud service by correlating timestamps and IP addresses across systems.
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 practitioner preparing for the CHFI 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.
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 Fundamentals and Process — This question tests Computer Forensics Fundamentals and Process — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A suspect's computer contains log files showing they accessed a server — Locard's Exchange Principle states that every contact leaves a trace. In digital forensics, this translates to the idea that when a system interacts with another, digital artifacts (such as log entries, registry keys, or network connection records) are created. Option A is correct because the log files on the suspect's computer are a direct trace of the contact between the suspect's system and the server, demonstrating the principle in a digital context.
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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