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CAS-004 Practice Question: Wants to implement a solution that ensures data…
An organization wants to implement a solution that ensures data cannot be read if a storage device is physically stolen. Which encryption approach BEST meets this requirement?
⚠ Common exam trap
The CAS-004 exam often tests the distinction between encryption of data in transit (TLS) and encryption of data at rest (FDE), leading candidates to mistakenly choose a network encryption solution when the question explicitly involves a stolen storage device.
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
✓
Full disk encryption (FDE) on the storage device
Full disk encryption (FDE) encrypts the entire storage device at the block level, including the operating system, applications, and all data. If the device is physically stolen, the data remains unreadable without the decryption key or passphrase, as the encryption is transparent and covers all sectors of the drive. This directly addresses the requirement of protecting data at rest on a stolen storage device.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Transport Layer Security (TLS) for network traffic
Why it's wrong here
Protects data in transit, not at rest.
- ✗
File-level encryption on sensitive documents
Why it's wrong here
Does not cover all data on the device.
- ✗
Database column-level encryption for stored data
Why it's wrong here
Only encrypts specific database fields, not the entire device.
- ✓
Full disk encryption (FDE) on the storage device
Why this is correct
Encrypts all data on the device, protecting against physical theft.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CAS-005 practice question is part of Courseiva's free CompTIA 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 CAS-005 exam.