CHFI Computer Forensics Fundamentals and Process Practice Question
A forensic examiner needs to create a bit-for-bit copy of a suspect's hard drive for analysis. Which tool is specifically designed for this purpose and can also verify integrity using hashing?
⚠ Common exam trap
EC-Council CHFI often tests the distinction between general-purpose tools (like `dd`) and specialized forensic tools (like FTK Imager), but here the trap is that candidates may confuse network or exploitation tools (Wireshark, Metasploit, Nmap) with disk imaging utilities, assuming any 'analysis' tool can create a bit-for-bit copy.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
dd
The `dd` command is a Unix/Linux utility that performs low-level bit-for-bit copying of storage devices, creating an exact forensic image (e.g., raw .dd or .img format). It can verify integrity by piping the output through a hashing tool like `md5sum` or `sha256sum`, or by using `dd` with `conv=noerror,sync` and later comparing hash values of the source and destination.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Wireshark
Why it's wrong here
Wireshark is a network protocol analyzer that captures and inspects packets traversing a network interface. It operates at the data-link and network layers, decoding protocols like TCP/IP, HTTP, and DNS, and has no capability to read or duplicate raw storage media. A forensic examiner needing a bit-for-bit copy of a drive would find Wireshark irrelevant, since it cannot access block devices or sector-level data.
- ✗
Metasploit
Why it's wrong here
Metasploit is an offensive security framework used to develop, test, and execute exploit code against vulnerable systems. It focuses on remote exploitation, payload delivery, and post-exploitation activity, not on creating raw forensic images from physical storage. Because it works by interacting with live services and system vulnerabilities, it cannot perform the low-level, sector-by-sector duplication that a bit-for-bit copy requires, and using it would introduce unintended changes to evidence.
- ✗
Nmap
Why it's wrong here
Nmap is a network scanning and enumeration tool that sends crafted packets to discover hosts, open ports, and running services on a network. It gathers information about network topology and service versions, but does not read or copy data from storage devices at the block level. For forensic imaging, Nmap is irrelevant because it never touches the filesystem or raw disk, and it cannot produce an exact sector-by-sector duplicate for evidence preservation.
- ✓
dd
Why this is correct
dd is the standard Unix/Linux utility for low-level data replication, and it creates a bit-for-bit image by reading every sector of the source device and writing it verbatim to an output destination. For example, `dd if=/dev/sda of=/evidence/disk.img bs=4K conv=noerror,sync` copies all blocks including slack space and deleted files, which is essential for forensic preservation. Combined with hashing tools like sha256sum, dd allows the examiner to verify the integrity of the copy, making it the correct choice for this task.
Go deeper
Related to this question
Learn chapter
Forensic Investigation Process and Methodology
Key term
EnCase Forensic
EnCase Forensic is a digital forensics software suite used by investigators to acquire, analyze, and report on data from computers and mobile devices in a legally admissible way.
Key term
Evidence Admissibility
Evidence admissibility is the legal and technical standard that determines whether digital evidence can be used in a court of law.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CHFI practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CHFI exam.