The correct answer is to enable encryption at rest when creating the RDS DB instance and use AWS KMS to manage the encryption key. This is because Amazon RDS encryption at rest uses AWS Key Management Service (KMS) to automatically encrypt the underlying storage, automated backups, read replicas, and snapshots using AES-256 encryption, and this setting must be specified at launch time since it cannot be added later to an unencrypted instance. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of immutable infrastructure and security best practices, often appearing as a trap where candidates mistakenly think encryption can be enabled post-creation or confuse SSL/TLS (encryption in transit) with at-rest encryption. A common memory tip is “encrypt at birth or not at all” — remember that RDS encryption is a one-time decision at instance creation, and KMS is the key manager, not S3 or SSL.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps team is designing a solution to encrypt data at rest for an Amazon RDS for MySQL database. Which TWO actions should the team take? (Choose TWO.)
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 to create a customer managed key and assign it to the RDS instance
Option A is correct: enable encryption at rest when creating the RDS instance. Option C is correct: use AWS KMS to manage the encryption key. Option B is wrong: encryption cannot be enabled on an unencrypted RDS instance after creation. Option D is wrong: S3 is not used for RDS encryption. Option E is wrong: SSL/TLS is for encryption in transit, not at rest.
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.
✗
Enable encryption after creating the RDS instance by modifying the instance
Why it's wrong here
RDS does not allow enabling encryption on existing instances; must create a new encrypted instance.
Use AWS KMS to create a customer managed key and assign it to the RDS instance
Why this is correct
KMS keys are used for RDS encryption.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable encryption at rest when creating the RDS DB instance
Why this is correct
Encryption must be enabled at creation time.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store the database files in an encrypted S3 bucket
Why it's wrong here
RDS manages storage internally; S3 is not used.
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 DOP-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 — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use AWS KMS to create a customer managed key and assign it to the RDS instance — Option A is correct: enable encryption at rest when creating the RDS instance. Option C is correct: use AWS KMS to manage the encryption key. Option B is wrong: encryption cannot be enabled on an unencrypted RDS instance after creation. Option D is wrong: S3 is not used for RDS encryption. Option E is wrong: SSL/TLS is for encryption in transit, not at rest.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company is using Amazon RDS for MySQL and needs to encrypt the database at rest. Which action should be taken to enable encryption?
easy
A.Create a read replica with encryption enabled
B.Use AWS Secrets Manager to encrypt the data
✓ C.Enable encryption when creating the DB instance
D.Modify the existing DB instance and enable encryption
Why C: Encryption at rest for RDS can only be enabled at creation time. Option B is wrong because encryption cannot be added later. Option C is wrong because enabling encryption on an existing instance is not supported. Option D is wrong because client-side encryption is not native and requires application changes.
Variation 2. A company uses Amazon RDS for MySQL with Multi-AZ deployment. The security team requires that all data be encrypted at rest and that automated backups are also encrypted. Which configuration meets these requirements?
medium
A.Use an S3 bucket policy to enforce encryption for backup files.
✓ B.Enable encryption for the RDS instance using AWS KMS.
C.Enable encryption on automated backups only after creating a snapshot.
D.Enable encryption on the underlying EBS volumes using KMS.
Why B: Option D is correct because enabling encryption on the RDS instance encrypts the data, automated backups, and snapshots. Option A is wrong because encrypting the storage separately is not sufficient; RDS encryption is needed. Option B is wrong because snapshot encryption does not encrypt the live database. Option C is wrong because RDS does not support S3 bucket policy for encryption.
Variation 3. A DevOps engineer is tasked with encrypting data at rest for an Amazon RDS for MySQL database. Which TWO methods can achieve this?
medium
✓ A.Enable encryption when creating the DB instance using a customer-managed KMS key.
✓ B.Enable encryption when creating the DB instance using the AWS managed KMS key.
C.Use the default RDS encryption with a customer-managed key without KMS.
D.Enable encryption on an existing unencrypted DB instance by modifying the instance.
E.Use client-side encryption with the RDS SDK.
Why A: Options A and B are correct because enabling encryption at launch is the standard method, and using KMS with a custom key provides customer-managed encryption. Option C is wrong because you cannot enable encryption on an unencrypted DB instance after launch. Option D is wrong because the default RDS encryption uses KMS even with the AWS managed key. Option E is wrong because client-side encryption is not a feature of RDS; it would need application-level changes.
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This DOP-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 DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.