The answer is full-disk encryption (FDE). This is the most effective control to prevent data loss from a stolen laptop because FDE encrypts the entire storage drive, rendering all data at rest unreadable without the proper decryption key, even if the drive is removed and forensically analyzed. Unlike file-level encryption or access controls, FDE protects against physical theft by ensuring that the data remains inaccessible without authentication at boot. On the CISSP exam, this question tests your understanding of the Domain 2 (Asset Security) concept of protecting data at rest, and it often appears as a distractor against weaker controls like BIOS passwords or screen locks. A common trap is choosing "remote wipe," which is a corrective control that requires network connectivity and may not activate before the thief disconnects the device. Memory tip: FDE is your "last line of defense" when the laptop leaves your hands—think "Full Disk = Full Protection" against physical loss.
CISSP Asset Security Practice Question
This CISSP practice question tests your understanding of asset security. 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.
An organization wants to protect sensitive data stored on laptops. Which of the following is the MOST effective control to prevent data loss if a laptop is stolen?
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)
Full-disk encryption (FDE) renders the data on the laptop unreadable without the decryption key, even if the storage drive is removed and analyzed. This is the most effective preventive control against data loss from theft because it protects data at rest regardless of physical access to the device.
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.
✗
BIOS password
Why it's wrong here
A BIOS password can be bypassed by removing the hard drive and accessing it from another system.
✗
Asset tracking software
Why it's wrong here
Asset tracking helps locate the device but does not prevent data access.
✓
Full-disk encryption (FDE)
Why this is correct
FDE encrypts the entire drive, making data inaccessible without the key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Remote wipe capability
Why it's wrong here
Remote wipe requires the laptop to be connected to the network, which may not be possible if it is stolen and kept offline.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose remote wipe (D) because it sounds proactive, but they overlook that it requires network connectivity and is a corrective control, whereas full-disk encryption is a preventive control that works even offline.
Detailed technical explanation
How to think about this question
FDE typically uses AES-256 encryption with a key derived from a user's pre-boot authentication password (e.g., via TPM or BitLocker's TPM+PIN). Under the hood, the encryption operates at the sector level, so even if the drive is connected to a forensic workstation, the ciphertext is indecipherable without the key. A real-world scenario: a stolen laptop with FDE remains secure even if the thief removes the SSD and connects it via USB, whereas a BIOS password or remote wipe would fail in that situation.
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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CISSP question in full detail.
Asset Security — This question tests Asset Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Full-disk encryption (FDE) — Full-disk encryption (FDE) renders the data on the laptop unreadable without the decryption key, even if the storage drive is removed and analyzed. This is the most effective preventive control against data loss from theft because it protects data at rest regardless of physical access to the device.
What should I do if I get this CISSP 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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