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.
A security analyst notices that a log file on a Linux server shows repeated failed SSH login attempts from an external IP address, but no successful login from that IP. However, the /var/log/auth.log file has been recently truncated. Which type of evidence is the truncated log file?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Direct evidence
The truncated log file is direct evidence because it is a tangible, physical artifact that, by its very state (having been truncated), directly indicates that an action was taken to alter or destroy log data. In computer forensics, direct evidence is evidence that, if believed, proves a fact without any inference or presumption. The truncation itself is a fact that can be observed and analyzed, and it directly supports the conclusion that someone tampered with the log file to conceal the failed SSH login attempts.
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.
✗
Hearsay evidence
Why it's wrong here
Hearsay is secondhand testimony; a log file is considered a record, not hearsay if properly authenticated.
✗
Best evidence
Why it's wrong here
Best evidence rule prefers originals, but this is a type classification, not a rule.
✗
Circumstantial evidence
Why it's wrong here
It directly shows the truncation, not an inferred fact.
✓
Direct evidence
Why this is correct
The truncated log file is a direct artifact of an action (tampering) and can be directly observed.
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 distinction between direct and circumstantial evidence by presenting a scenario where the evidence (like a truncated log) seems to require inference, but the trap is that the physical state of the file is itself a directly observable fact, not an inference, making it direct evidence of tampering.
Trap categories for this question
Command / output trap
It directly shows the truncation, not an inferred fact.
Detailed technical explanation
How to think about this question
Under the hood, file truncation on Linux can be performed using commands like `truncate -s 0 /var/log/auth.log` or by redirecting output with `> /var/log/auth.log`, which sets the file size to zero while preserving inode and permissions. This is a common anti-forensics technique because it removes all log entries without deleting the file, making it harder to detect via simple file existence checks. In a real-world scenario, an attacker might truncate auth.log after a brute-force SSH attack to erase evidence of their IP address, but the truncation event itself can be recovered from filesystem journaling (e.g., ext4 journal) or from log rotation timestamps, providing direct evidence of tampering.
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: Direct evidence — The truncated log file is direct evidence because it is a tangible, physical artifact that, by its very state (having been truncated), directly indicates that an action was taken to alter or destroy log data. In computer forensics, direct evidence is evidence that, if believed, proves a fact without any inference or presumption. The truncation itself is a fact that can be observed and analyzed, and it directly supports the conclusion that someone tampered with the log file to conceal the failed SSH login attempts.
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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