The answer is to use a customer managed KMS key with EBS encryption, as this provides the most control over the encryption keys. With a customer managed key, you have full authority to define key rotation policies, set granular IAM permissions, and enable key disabling or deletion, whereas AWS managed keys lock you out of these administrative actions. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of the shared responsibility model for data-at-rest protection—a common trap is assuming that enabling EBS encryption by default gives you control, but that default uses AWS managed keys unless you explicitly specify a customer managed key. Remember the memory tip: "Customer managed means custom control; default means delegated." This distinction is critical because client-side encryption, while offering control, requires application-level changes and is not a direct EBS encryption solution.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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.
A company needs to protect data at rest on Amazon EBS volumes attached to EC2 instances. Which solution provides the most control over the encryption keys?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a customer managed KMS key with EBS encryption.
Option A is correct because using a customer managed KMS key allows the customer to control key rotation, policies, and access. Option B is wrong because AWS managed keys do not allow customer control. Option C is wrong because EBS encryption by default uses AWS managed keys unless specified. Option D is wrong because client-side encryption would require application changes.
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.
✓
Use a customer managed KMS key with EBS encryption.
Why this is correct
Customer managed keys give full control over key lifecycle and permissions.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encrypt data using client-side encryption before writing to EBS.
Why it's wrong here
Client-side encryption adds complexity and does not leverage EBS-native encryption.
✗
Use an AWS managed KMS key for EBS encryption.
Why it's wrong here
AWS managed keys cannot be customized or controlled by the customer.
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a customer managed KMS key with EBS encryption. — Option A is correct because using a customer managed KMS key allows the customer to control key rotation, policies, and access. Option B is wrong because AWS managed keys do not allow customer control. Option C is wrong because EBS encryption by default uses AWS managed keys unless specified. Option D is wrong because client-side encryption would require application changes.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This SCS-C02 practice question is part of Courseiva's free Amazon Web Services 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 SCS-C02 exam.
Question Discussion
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