The answer is to enable automatic key rotation on the KMS key, as AWS KMS supports automatic yearly rotation for customer managed symmetric keys, which rotates the backing cryptographic material while preserving the same key ID, ensuring seamless encryption continuity. This is correct because automatic rotation is a native KMS feature that requires no manual intervention, and you can optionally use a CloudWatch Events rule to receive notifications before the rotation occurs. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of key lifecycle management and the distinction between automatic rotation (which keeps the key ID) and manual rotation (which creates a new key and ID). A common trap is confusing S3 bucket policies with key rotation controls, but remember that KMS key rotation is managed entirely within KMS, not at the S3 level. Memory tip: think "same ID, new backing key" for automatic rotation.
DOP-C02 Security and Compliance Practice Question
This DOP-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.
A company uses AWS KMS to encrypt data at rest in S3. The security team wants to ensure that KMS keys are rotated automatically every year. Which THREE steps should be taken?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a CloudWatch Events rule to notify the security team before the rotation date.
Option A is correct because automatic key rotation is enabled in KMS for symmetric keys. Option B is correct because key rotation rotates the backing key while keeping the same key ID. Option C is correct because a CloudWatch Events rule can notify before rotation. Option D is wrong because manual rotation creates a new key, which is not automatic. Option E is wrong because S3 bucket policy does not manage key rotation.
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 CloudWatch Events rule to notify the security team before the rotation date.
Why this is correct
CloudWatch Events can trigger notifications based on KMS key rotation events.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure an S3 bucket policy to enforce key rotation.
Why it's wrong here
S3 bucket policy cannot enforce KMS key rotation.
✓
Enable automatic key rotation on the KMS key.
Why this is correct
KMS supports automatic rotation for symmetric CMKs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Ensure the key policy allows the kms:RotateKeyOnDemand action.
Why it's wrong here
Automatic rotation does not require this permission; it is managed by KMS.
✗
Create a new KMS key every year and update the application to use the new key.
Why it's wrong here
This is manual rotation, not automatic.
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: Create a CloudWatch Events rule to notify the security team before the rotation date. — Option A is correct because automatic key rotation is enabled in KMS for symmetric keys. Option B is correct because key rotation rotates the backing key while keeping the same key ID. Option C is correct because a CloudWatch Events rule can notify before rotation. Option D is wrong because manual rotation creates a new key, which is not automatic. Option E is wrong because S3 bucket policy does not manage key rotation.
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.
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Question Discussion
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