The answer is that no additional action is required because RDS backup encryption inherits the KMS key automatically. When you enable encryption at rest for an RDS for MySQL instance using a customer-managed KMS key, that same key is applied to all automated backups, manual snapshots, and read replicas without any extra configuration. This behavior stems from RDS’s design where the backup storage layer in S3 is tied to the instance’s encryption context, ensuring consistency and preventing key mismatches. On the AWS Certified Database Specialty DBS-C01 exam, this concept tests your understanding of RDS’s integrated encryption model, often appearing as a trap where candidates mistakenly think a separate key or S3 default encryption is needed. Remember the memory tip: “One key to rule them all” — the instance key governs backups, snapshots, and replicas, so never overcomplicate the setup.
DBS-C01 Database Security Practice Question
This DBS-C01 practice question tests your understanding of database security. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 using Amazon RDS for MySQL with encryption at rest enabled. The security team wants to ensure that the database backups stored in Amazon S3 are also encrypted using a customer-managed KMS key. What should be done to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No additional action is required; RDS automatically uses the same KMS key for backups.
The correct answer is A because RDS automatically encrypts automated backups, snapshots, and read replicas with the same KMS key used for the DB instance. Option B is incorrect because RDS does not support a separate KMS key for backups; it inherits the key from the DB instance. Option C is incorrect because RDS automatically encrypts backups at rest with the same key. Option D is incorrect because enabling S3 default encryption is not applicable to RDS backup storage.
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.
✗
Create a new KMS key and specify it when creating the DB instance to encrypt backups differently.
Why it's wrong here
A different key cannot be specified for backups; the instance key is used.
✓
No additional action is required; RDS automatically uses the same KMS key for backups.
Why this is correct
RDS automatically encrypts backups with the same key.
Related concept
Read the scenario before looking for a memorised answer.
✗
Modify the DB instance to enable backup encryption using a new KMS key.
Why it's wrong here
Modifying does not allow separate backup encryption.
✗
Enable default encryption on the S3 bucket where backups are stored.
Why it's wrong here
RDS backup storage is managed by RDS, not directly on S3 by the user.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DBS-C01 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.
Database Security — This question tests Database Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No additional action is required; RDS automatically uses the same KMS key for backups. — The correct answer is A because RDS automatically encrypts automated backups, snapshots, and read replicas with the same KMS key used for the DB instance. Option B is incorrect because RDS does not support a separate KMS key for backups; it inherits the key from the DB instance. Option C is incorrect because RDS automatically encrypts backups at rest with the same key. Option D is incorrect because enabling S3 default encryption is not applicable to RDS backup storage.
What should I do if I get this DBS-C01 question wrong?
Identify which DBS-C01 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 DBS-C01 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 DBS-C01 exam.
Question Discussion
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