The answer is to take a snapshot of the VM via the hypervisor and export the .vmem file. This method is considered forensically sound because it captures the entire volatile memory state from outside the guest operating system, ensuring no data inside the VM is altered or contaminated by executing tools within the suspect environment. On the Computer Hacking Forensic Investigator CHFI exam, this concept tests your understanding of cloud forensic acquisition principles, where the hypervisor’s snapshot feature preserves memory in its pristine state, avoiding the common trap of using in-guest tools that modify evidence. A key memory tip: think “outside-in” for forensically sound memory dumps—always acquire from the hypervisor layer, not the guest.
CHFI Network and Cloud Forensics Practice Question
This CHFI practice question tests your understanding of network and cloud forensics. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 cloud forensic investigation, the analyst needs to obtain a memory dump of a virtual machine. Which method is considered forensically sound?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Take a snapshot of the VM via the hypervisor and export the .vmem file
Option D is forensically sound because taking a snapshot of the VM via the hypervisor and exporting the .vmem file captures the entire volatile memory state from outside the guest OS, without altering any data inside the VM. This method preserves the memory in its pristine state and avoids the contamination that occurs when executing tools inside the suspect VM.
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.
✗
Log into the VM and use a tool to create a crash dump
Why it's wrong here
This can alter the system state and is not recommended.
✗
Copy the virtual disk file (.vmdk) and extract memory from it
Why it's wrong here
Virtual disk files do not contain memory; memory is separate.
✗
Use a live forensic tool inside the VM to capture memory
Take a snapshot of the VM via the hypervisor and export the .vmem file
Why this is correct
This method captures the VM's memory in a forensically sound manner.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a virtual disk file (.vmdk) contains memory data, when in fact it only stores persistent storage, and that live tools inside the VM are acceptable despite violating forensic soundness by altering the evidence.
Detailed technical explanation
How to think about this question
When a hypervisor (e.g., VMware ESXi) takes a snapshot, it creates a .vmem file that is a raw binary dump of the VM's assigned RAM, including kernel structures, process lists, and network connections. This file can be analyzed with tools like Volatility using the appropriate profile (e.g., Win10x64_18362) to extract artifacts such as running processes, open sockets, and encryption keys, all without the guest OS being aware of the acquisition. In real-world cloud forensics (e.g., AWS Nitro or Azure Hyper-V), the equivalent method is using the cloud provider's snapshot or save-state feature to capture memory from the hypervisor layer, ensuring integrity.
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 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.
Network and Cloud Forensics — This question tests Network and Cloud Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Take a snapshot of the VM via the hypervisor and export the .vmem file — Option D is forensically sound because taking a snapshot of the VM via the hypervisor and exporting the .vmem file captures the entire volatile memory state from outside the guest OS, without altering any data inside the VM. This method preserves the memory in its pristine state and avoids the contamination that occurs when executing tools inside the suspect VM.
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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