CHFI Storage Forensics and File System Analysis Practice Question
This CHFI practice question tests your understanding of storage forensics and file system analysis. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
In a RAID 5 array with three disks, one disk fails. The investigator images the remaining two disks and wants to reconstruct the missing data. Which approach is most appropriate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply XOR operation between the two disk images to recover missing data
RAID 5 uses parity distributed across disks. Given two data disks, the third can be reconstructed by XORing the parity with the remaining data. However, the investigator must know the stripe size and parity layout.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Apply XOR operation between the two disk images to recover missing data
Why this is correct
RAID 5 XOR parity can reconstruct missing data from remaining disks.
Related concept
Static NAT maps one inside address to one outside address.
✗
Mount the two disks in a Linux mdadm array with a missing disk
Why it's wrong here
mdadm can assemble degraded array, but requires correct parameters. XOR is the underlying method.
✗
Use dd to concatenate the two disk images linearly
Why it's wrong here
Concatenation ignores the RAID striping and parity.
✗
Use a tool like R-Studio to perform a virtual RAID rebuild
Why it's wrong here
R-Studio can assist, but the core principle is XOR. However, this is a practical tool, but the question asks for approach.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
Storage Forensics and File System Analysis — This question tests Storage Forensics and File System Analysis — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Apply XOR operation between the two disk images to recover missing data — RAID 5 uses parity distributed across disks. Given two data disks, the third can be reconstructed by XORing the parity with the remaining data. However, the investigator must know the stripe size and parity layout.
What should I do if I get this CHFI question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CHFI NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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