The answer is full-disk encryption, as it is the best control for protecting data on a stolen laptop. Full-disk encryption (FDE) secures the entire storage volume, including the operating system, applications, and files like customer pricing spreadsheets and contract drafts, by encrypting all data at rest. Without the decryption key—such as a pre-boot PIN or TPM-based key—the thief cannot access any files, even if the drive is removed and attached to another system. On the Security+ SY0-701 exam, this question tests your understanding of data-at-rest protections and physical theft scenarios, often appearing as a contrast to file-level encryption or BitLocker To Go. A common trap is choosing a screen lock or BIOS password, which only prevent casual access but do not protect against drive removal. Remember the mnemonic: “FDE locks the whole drive, not just the door.”
SY0-701 General Security Concepts Practice Question
This SY0-701 practice question tests your understanding of general security concepts. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A sales manager's laptop is often taken home and may contain customer pricing spreadsheets and contract drafts. Which control best protects the files if the laptop is stolen?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Full-disk encryption (FDE) protects all data on the laptop's storage drive by encrypting the entire volume, including the operating system, applications, and files. If the laptop is stolen, the thief cannot access the customer pricing spreadsheets and contract drafts without the decryption key (e.g., a pre-boot PIN or TPM-based key). This renders the data unreadable even if the drive is removed and attached to another system, directly addressing the risk of physical theft.
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.
✗
Hashing the files
Why it's wrong here
Hashing verifies integrity, but it does not make stolen files unreadable to a thief.
✓
Full-disk encryption
Why this is correct
Full-disk encryption protects data at rest, so stolen storage is unreadable without the correct key.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Using TLS on the office Wi-Fi
Why it's wrong here
TLS protects data in transit, but it does not protect files already stored on the laptop.
✗
File compression
Why it's wrong here
Compression reduces file size, but it does not provide any meaningful security protection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse confidentiality controls (encryption) with integrity controls (hashing) or network protection (TLS), mistakenly thinking hashing or TLS can protect data at rest on a stolen device.
Detailed technical explanation
How to think about this question
Full-disk encryption typically uses a symmetric cipher like AES-256 in XTS mode (e.g., BitLocker with AES-XTS) to encrypt every sector of the drive. The encryption key is often sealed by the TPM (Trusted Platform Module) and released only after a successful pre-boot authentication, such as a PIN or USB key. In a real-world scenario, even if the thief removes the SSD and connects it to a forensic workstation, the encrypted data appears as random noise without the key, making FDE the gold standard for data-at-rest protection on mobile devices.
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 SY0-701 question in full detail.
General Security Concepts — This question tests General Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Full-disk encryption — Full-disk encryption (FDE) protects all data on the laptop's storage drive by encrypting the entire volume, including the operating system, applications, and files. If the laptop is stolen, the thief cannot access the customer pricing spreadsheets and contract drafts without the decryption key (e.g., a pre-boot PIN or TPM-based key). This renders the data unreadable even if the drive is removed and attached to another system, directly addressing the risk of physical theft.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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