DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 developer is using Amazon S3 to store sensitive data. The compliance team requires that all objects be encrypted at rest using server-side encryption with a customer-managed key (SSE-KMS). Which THREE steps must the developer take to enforce this requirement? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an AWS KMS customer-managed key.
Options A, C, and D are correct. Using a KMS key for encryption ensures SSE-KMS; bucket policies can deny writes without the correct encryption header; default encryption enforces SSE-KMS. Option B is wrong because S3 does not automatically encrypt with SSE-KMS without configuration. Option E is wrong because bucket ACLs do not control encryption.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 an AWS KMS customer-managed key.
Why this is correct
A customer-managed key is required for SSE-KMS.
Related concept
Standard ACLs match source addresses.
✗
Configure the bucket ACL to require encryption.
Why it's wrong here
ACLs do not control encryption.
✓
Add a bucket policy that denies PutObject if the x-amz-server-side-encryption header is not set to 'aws:kms'.
Why this is correct
Bucket policy can enforce encryption header requirement.
Related concept
Standard ACLs match source addresses.
✗
Enable S3 default encryption with SSE-S3.
Why it's wrong here
SSE-S3 uses S3-managed keys, not customer-managed.
✓
Set the bucket's default encryption to SSE-KMS using the customer-managed key.
Why this is correct
Default encryption applies when no encryption header is provided.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
Development with AWS Services — This question tests Development with AWS Services — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create an AWS KMS customer-managed key. — Options A, C, and D are correct. Using a KMS key for encryption ensures SSE-KMS; bucket policies can deny writes without the correct encryption header; default encryption enforces SSE-KMS. Option B is wrong because S3 does not automatically encrypt with SSE-KMS without configuration. Option E is wrong because bucket ACLs do not control encryption.
What should I do if I get this DVA-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DVA-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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