This DEA-C01 practice question tests your understanding of data store management. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 data engineer is setting up an Amazon S3 bucket for storing sensitive financial data. The compliance team requires that all data be encrypted at rest using a customer-managed AWS KMS key. Additionally, the bucket must block public access. Which combination of settings should the engineer configure?
Enable default encryption with AWS-KMS and a customer managed key. Enable block public access settings.
This ensures all objects are encrypted with the specified KMS key and public access is blocked.
B
Use S3 Object Ownership to enforce bucket owner enforced. Enable block public access.
Why wrong: Object Ownership controls object ownership, not encryption.
C
Use S3 Bucket Keys to reduce KMS costs. Enable block public access.
Why wrong: Bucket Keys reduce costs but do not set default encryption.
D
Create a bucket policy that denies PutObject without encryption. Enable block public access.
Why wrong: Bucket policy can enforce encryption but does not set a default; objects can still be uploaded without encryption if the policy is bypassed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable default encryption with AWS-KMS and a customer managed key. Enable block public access settings.
Option A is correct because enabling default encryption with AWS-KMS using a customer-managed key ensures that all objects uploaded to the S3 bucket are automatically encrypted at rest with the required key type. Additionally, enabling block public access settings prevents any public access to the bucket, satisfying the compliance team's requirements.
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 default encryption with AWS-KMS and a customer managed key. Enable block public access settings.
Why this is correct
This ensures all objects are encrypted with the specified KMS key and public access is blocked.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 Object Ownership to enforce bucket owner enforced. Enable block public access.
Why it's wrong here
Object Ownership controls object ownership, not encryption.
✗
Use S3 Bucket Keys to reduce KMS costs. Enable block public access.
Why it's wrong here
Bucket Keys reduce costs but do not set default encryption.
✗
Create a bucket policy that denies PutObject without encryption. Enable block public access.
Why it's wrong here
Bucket policy can enforce encryption but does not set a default; objects can still be uploaded without encryption if the policy is bypassed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a bucket policy denying unencrypted uploads is sufficient, but it does not enforce the use of a customer-managed KMS key, nor does it automatically encrypt objects that lack encryption headers.
Detailed technical explanation
How to think about this question
Default encryption on an S3 bucket applies server-side encryption automatically to all objects uploaded without explicit encryption headers. When using AWS-KMS with a customer-managed key (SSE-KMS with CMK), the bucket policy can also be combined with a condition like `kms:EncryptionContext` to enforce the specific key. Block public access settings override any bucket policies or ACLs that would allow public access, providing a defense-in-depth approach.
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.
TExam Day Tips
→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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable default encryption with AWS-KMS and a customer managed key. Enable block public access settings. — Option A is correct because enabling default encryption with AWS-KMS using a customer-managed key ensures that all objects uploaded to the S3 bucket are automatically encrypted at rest with the required key type. Additionally, enabling block public access settings prevents any public access to the bucket, satisfying the compliance team's requirements.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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