Quick Answer
The answer is AWS Key Management Service (AWS KMS), as it is the primary service used to manage the encryption keys that protect data at rest in Amazon RDS. When you enable encryption for an RDS instance, AWS KMS generates and controls the customer master keys (CMKs) that encrypt the underlying storage, automated backups, read replicas, and snapshots, ensuring that data is encrypted before it is written to disk. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of how encryption at rest is implemented through integrated key management, often appearing in scenario-based questions where you must distinguish between KMS and other services like CloudHSM or AWS Certificate Manager. A common trap is confusing CloudHSM with KMS—remember that RDS natively integrates only with KMS for encryption at rest, while CloudHSM requires custom applications. Memory tip: "KMS Keeps My Storage safe" for RDS encryption.
This SOA-C02 practice question tests your understanding of security and compliance. 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 TWO AWS services can be used to encrypt data at rest in Amazon RDS? (Choose TWO.)
AWS Certificate Manager (ACM)
Why wrong: ACM is for SSL/TLS certificates.
AWS CloudHSM
Why wrong: CloudHSM is not directly used by RDS for encryption at rest.
AWS Identity and Access Management (IAM)
Why wrong: IAM is for permissions, not encryption.
Amazon RDS encryption feature
RDS supports encryption at rest using KMS.
AWS Key Management Service (AWS KMS)
KMS provides encryption keys for RDS encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon RDS encryption feature
Option B is correct because AWS KMS can be used to manage keys for RDS encryption. Option C is correct because RDS supports encryption at rest using AWS KMS. Option A is wrong because AWS Certificate Manager is for SSL/TLS certificates. Option D is wrong because CloudHSM is a hardware security module but not directly integrated with RDS for encryption at rest. Option E is wrong because IAM is for access control.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Certificate Manager (ACM)
Why it's wrong here
ACM is for SSL/TLS certificates.
AWS CloudHSM
Why it's wrong here
CloudHSM is not directly used by RDS for encryption at rest.
AWS Identity and Access Management (IAM)
Why it's wrong here
IAM is for permissions, not encryption.
Amazon RDS encryption feature
Why this is correct
RDS supports encryption at rest using KMS.
Related concept
Read the scenario before looking for a memorised answer.
AWS Key Management Service (AWS KMS)
Why this is correct
KMS provides encryption keys for RDS encryption.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
Identify which SOA-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.
Security and Compliance — study guide chapter
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FAQ
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon RDS encryption feature — Option B is correct because AWS KMS can be used to manage keys for RDS encryption. Option C is correct because RDS supports encryption at rest using AWS KMS. Option A is wrong because AWS Certificate Manager is for SSL/TLS certificates. Option D is wrong because CloudHSM is a hardware security module but not directly integrated with RDS for encryption at rest. Option E is wrong because IAM is for access control.
Identify which SOA-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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This SOA-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 SOA-C02 exam.
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