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.
Locard's exchange principle in digital forensics states that:
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Every contact leaves a trace, and digital evidence is no exception
Locard's exchange principle, originally from forensic science, asserts that whenever two objects come into contact, a transfer of material occurs. In digital forensics, this translates to the fact that digital devices and systems inevitably leave traces of their interactions—such as log entries, metadata, file artifacts, or network packets—making it possible to reconstruct events. Option D correctly captures this core idea that every contact leaves a trace, and digital evidence is no exception.
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.
✗
The chain of custody must be documented for all evidence
Why it's wrong here
While true, this is not Locard's principle.
✗
Digital evidence is always stored in the cloud
Why it's wrong here
Digital evidence can be stored locally, not always in the cloud.
✗
Only the forensic examiner can handle evidence
Why it's wrong here
Multiple authorized personnel may handle evidence; Locard's principle is about trace exchange.
✓
Every contact leaves a trace, and digital evidence is no exception
Why this is correct
This is the direct application of Locard's principle to digital evidence.
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 whether candidates confuse procedural concepts (like chain of custody) with the foundational scientific principle of trace evidence transfer, leading them to pick Option A instead of D.
Detailed technical explanation
How to think about this question
Under the hood, Locard's principle manifests in digital forensics through artifacts like Windows Prefetch files (.pf), $MFT entries, registry keys (e.g., NTUSER.DAT), and network flow records (NetFlow/IPFIX). For example, when a USB device is inserted, the Windows registry key SYSTEM\CurrentControlSet\Enum\USBSTOR logs the device serial number, while the SetupAPI.dev.log records driver installation events—both are traces of contact. In a real-world scenario, a suspect's computer may show no active files, but forensic analysis of $LogFile or $UsnJrnl can reveal deleted file operations, proving the principle holds even after anti-forensic attempts.
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: Every contact leaves a trace, and digital evidence is no exception — Locard's exchange principle, originally from forensic science, asserts that whenever two objects come into contact, a transfer of material occurs. In digital forensics, this translates to the fact that digital devices and systems inevitably leave traces of their interactions—such as log entries, metadata, file artifacts, or network packets—making it possible to reconstruct events. Option D correctly captures this core idea that every contact leaves a trace, and digital evidence is no exception.
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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