The correct solution is to use AWS KMS with a custom key store backed by AWS CloudHSM. This works because Amazon RDS for MySQL encrypts data at rest natively through AWS KMS, and a custom key store allows you to use keys stored in your own CloudHSM cluster rather than the default KMS key store. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of the difference between KMS-managed keys and customer-controlled HSMs; a common trap is assuming RDS integrates directly with CloudHSM, which it does not—RDS only talks to KMS. Remember that CloudHSM is the hardware, but KMS is the service that bridges it to RDS. A useful memory tip: think of the custom key store as a "KMS proxy" to your own HSM, not a direct connection.
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 is designing a data protection strategy for its Amazon RDS for MySQL database. The database contains sensitive data that must be encrypted at rest. The company also needs to manage the encryption keys using its own HSM. Which solution should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS KMS with a custom key store backed by AWS CloudHSM
RDS supports encryption at rest using KMS. To use a customer-managed HSM, you can use AWS CloudHSM with a custom key store in KMS. Option C is correct. Option A is incorrect because RDS does not directly integrate with CloudHSM. Option B is incorrect because the default key is AWS managed. Option D is incorrect because RDS does not support client-side encryption for at-rest data.
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 client-side encryption with a key from CloudHSM
Why it's wrong here
Client-side encryption is for data before storage, not RDS at rest.
✗
Use AWS CloudHSM to generate a key and import it into RDS
Why it's wrong here
RDS does not directly accept CloudHSM keys.
✗
Enable encryption at rest using the default AWS KMS key
Why it's wrong here
Default key is AWS managed, not customer HSM.
✓
Use AWS KMS with a custom key store backed by AWS CloudHSM
Why this is correct
Custom key store allows using own HSM.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 AWS KMS with a custom key store backed by AWS CloudHSM — RDS supports encryption at rest using KMS. To use a customer-managed HSM, you can use AWS CloudHSM with a custom key store in KMS. Option C is correct. Option A is incorrect because RDS does not directly integrate with CloudHSM. Option B is incorrect because the default key is AWS managed. Option D is incorrect because RDS does not support client-side encryption for at-rest data.
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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Question Discussion
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