CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. 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.
During a mobile forensic investigation, an examiner finds that the seized iPhone is locked with a passcode but is running iOS 11. Which acquisition method should the examiner prioritize to obtain the most data without bypassing the passcode?
Why wrong: Physical acquisition requires passcode bypass or advanced techniques like JTAG, which may not be feasible on iOS 11 without device-specific tools.
B
Logical acquisition via iTunes backup
iTunes backup can be initiated without passcode if device is trusted, and provides access to many artefacts including SMS, contacts, and call history.
C
File system acquisition using Cellebrite UFED
Why wrong: File system acquisition on iOS 11 typically requires passcode bypass or jailbreak; not possible without it.
D
Manual acquisition by photographing the screen
Why wrong: Manual acquisition yields only visible data and is not prioritized when more comprehensive methods are available.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Logical acquisition via iTunes backup
On iOS 11, a locked device prevents physical and file system acquisitions due to hardware encryption and the Secure Enclave. Logical acquisition via iTunes backup is the recommended method because it can extract most user data (contacts, messages, photos) without requiring the passcode to be bypassed, as the backup process is authorized by the device's trust relationship with a previously paired computer.
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.
✗
Physical acquisition using a JTAG tool
Why it's wrong here
Physical acquisition requires passcode bypass or advanced techniques like JTAG, which may not be feasible on iOS 11 without device-specific tools.
✓
Logical acquisition via iTunes backup
Why this is correct
iTunes backup can be initiated without passcode if device is trusted, and provides access to many artefacts including SMS, contacts, and call history.
Related concept
Read the scenario before looking for a memorised answer.
✗
File system acquisition using Cellebrite UFED
Why it's wrong here
File system acquisition on iOS 11 typically requires passcode bypass or jailbreak; not possible without it.
✗
Manual acquisition by photographing the screen
Why it's wrong here
Manual acquisition yields only visible data and is not prioritized when more comprehensive methods are available.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that physical acquisition is always superior, but on modern iOS devices, logical acquisition via iTunes backup is the only viable method for locked devices without bypassing the passcode.
Detailed technical explanation
How to think about this question
iOS 11 introduced enhanced security with hardware-backed key wrapping tied to the user's passcode, making file system encryption unbreakable without the passcode. The iTunes backup protocol uses a backup password (if set) but does not require the device passcode when the device has been previously trusted; the backup extracts data from the device's user partition via the Apple File Conduit (AFC) service, which is accessible on a locked device if the trust relationship is established. In real-world scenarios, examiners often rely on a suspect's computer to find an existing iTunes backup or to establish trust before the device is locked.
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.
Mobile and Malware Forensics — This question tests Mobile and Malware Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Logical acquisition via iTunes backup — On iOS 11, a locked device prevents physical and file system acquisitions due to hardware encryption and the Secure Enclave. Logical acquisition via iTunes backup is the recommended method because it can extract most user data (contacts, messages, photos) without requiring the passcode to be bypassed, as the backup process is authorized by the device's trust relationship with a previously paired computer.
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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