The answer is disabling USB ports via Group Policy and physically locking cases, combined with implementing data classification and labeling policies to raise awareness. These three methods form a dual-layer preventive control by eliminating both logical and physical access to removable media, directly addressing the attack vector for data exfiltration via removable media. On the CISSP exam, this tests your understanding of defense-in-depth within domain 2 (Asset Security), where physical and logical controls must work together—a common trap is choosing only technical solutions like encryption or DLP, which are detective or corrective rather than preventive. Remember that in a high-security environment, removing access entirely is more effective than monitoring it. Memory tip: “Lock, block, and label” — lock the case, block the port, and label the data.
CISSP Asset Security Practice Question
This CISSP practice question tests your understanding of asset security. 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.
Which THREE of the following are valid methods to reduce the risk of data exfiltration via removable media in a high-security environment?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable USB ports via group policy and physically lock cases
Disabling USB ports via Group Policy (using administrative templates to set 'Removable Storage: Deny write access' to 'Enabled') combined with physically locking cases (e.g., using case locks or cable locks to prevent unauthorized access to internal USB headers) provides a dual-layer preventive control. This directly eliminates the attack vector by removing both logical and physical access to removable media, which is the most effective method in a high-security environment.
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.
✓
Disable USB ports via group policy and physically lock cases
Why this is correct
Effective and enforceable control that physically prevents use of removable media.
Related concept
Read the scenario before looking for a memorised answer.
✗
Require annual security awareness training on data handling
Why it's wrong here
Training is necessary but not sufficient to prevent exfiltration on its own.
✗
Use full disk encryption on all endpoints
Why it's wrong here
Protects data if device is lost but does not prevent copying to removable media.
✓
Deploy endpoint DLP agents that block copy operations to removable media based on content
Why this is correct
Automatically prevents exfiltration of sensitive data based on rules.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement data classification and labeling policies to raise awareness
Why this is correct
Helps users identify sensitive data and avoid copying it.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse full disk encryption (a data-at-rest protection) with a data exfiltration prevention control, failing to recognize that encryption does not block the copy operation itself.
Detailed technical explanation
How to think about this question
Endpoint DLP agents (Option D) use content inspection engines (e.g., regex patterns, fingerprinting, or machine learning classifiers) to evaluate data before allowing a write operation to removable media, often hooking into the Windows Filter Manager or macOS I/O Kit to intercept file system calls. Data classification and labeling policies (Option E) are typically enforced through automated tools that apply metadata (e.g., using Microsoft Information Protection labels) and can trigger DLP rules to block exfiltration of classified data, but without technical enforcement, they are merely administrative controls. In a real-world scenario, a malicious insider could bypass full disk encryption by simply copying files to a USB drive while the system is running, as the OS decrypts data on-the-fly.
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: Disable USB ports via group policy and physically lock cases — Disabling USB ports via Group Policy (using administrative templates to set 'Removable Storage: Deny write access' to 'Enabled') combined with physically locking cases (e.g., using case locks or cable locks to prevent unauthorized access to internal USB headers) provides a dual-layer preventive control. This directly eliminates the attack vector by removing both logical and physical access to removable media, which is the most effective method in a high-security environment.
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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This CISSP practice question is part of Courseiva's free ISC2 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 CISSP exam.
Question Discussion
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