SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 company has an S3 bucket that stores sensitive data. The company wants to ensure that all objects uploaded to the bucket are encrypted at rest. Which solution should the solutions architect recommend?
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 on the S3 bucket using SSE-S3 or SSE-KMS.
Option D is correct because S3 default encryption ensures that all objects are encrypted at rest using SSE-S3 or SSE-KMS, regardless of whether the upload request specifies encryption. Option A is wrong because bucket policies cannot enforce encryption; they can deny uploads without encryption headers but are not the simplest method. Option B is wrong because S3 Access Points are used for managing access, not encryption. Option C is wrong while valid, it's more complex than simply enabling default 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.
✗
Use a bucket policy to deny uploads that do not include the x-amz-server-side-encryption header.
Why it's wrong here
This policy requires clients to specify encryption headers; it does not ensure encryption if headers are missing.
✗
Create an AWS Lambda function that encrypts objects after they are uploaded.
Why it's wrong here
Lambda can encrypt objects after upload, but there is a window where the object is unencrypted; default encryption is better.
✗
Configure an S3 Access Point with a policy that requires encryption.
Why it's wrong here
Access Points control access but not encryption at rest; they can enforce encryption in transit.
✓
Enable default encryption on the S3 bucket using SSE-S3 or SSE-KMS.
Why this is correct
Default encryption automatically encrypts all objects at rest.
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 SAP-C02 ACL questions on filtering logic and placement.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable default encryption on the S3 bucket using SSE-S3 or SSE-KMS. — Option D is correct because S3 default encryption ensures that all objects are encrypted at rest using SSE-S3 or SSE-KMS, regardless of whether the upload request specifies encryption. Option A is wrong because bucket policies cannot enforce encryption; they can deny uploads without encryption headers but are not the simplest method. Option B is wrong because S3 Access Points are used for managing access, not encryption. Option C is wrong while valid, it's more complex than simply enabling default encryption.
What should I do if I get this SAP-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 SAP-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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