The correct action is to enable default encryption on the S3 bucket using SSE-S3, SSE-KMS, or SSE-C. This ensures that all objects written to the bucket are automatically encrypted at rest, regardless of whether the uploader explicitly specifies encryption headers, because the bucket applies server-side encryption as a baseline setting. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this concept tests your understanding of S3 security mechanisms and the distinction between enforcing encryption via bucket policies versus default encryption—a common trap is assuming a bucket policy alone encrypts data, when in fact policies only deny unencrypted uploads but do not apply encryption retroactively. A key memory tip is: default encryption is the “safety net” that encrypts every object, while bucket policies are the “bouncer” that blocks unencrypted traffic; you need both for full compliance.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. 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 has an Amazon S3 bucket that stores sensitive data. The company wants to ensure that all data in the bucket is encrypted at rest. Which action should the Solutions Architect take?
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, SSE-KMS, or SSE-C.
Option A is correct because enabling default encryption on the bucket ensures all objects are encrypted. Option B is wrong because bucket policies do not encrypt data. Option C is wrong because CloudHSM is not required. Option D is wrong because pre-signed URLs do not enforce encryption.
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 on the S3 bucket using SSE-S3, SSE-KMS, or SSE-C.
Why this is correct
Default encryption encrypts all objects stored.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CloudHSM to manage encryption keys.
Why it's wrong here
CloudHSM is not necessary for S3 encryption.
✗
Configure a bucket policy that denies unencrypted uploads.
Why it's wrong here
This only denies, does not encrypt existing objects.
✗
Require the use of pre-signed URLs for uploads.
Why it's wrong here
Pre-signed URLs do not enforce encryption.
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 SAP-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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable default encryption on the S3 bucket using SSE-S3, SSE-KMS, or SSE-C. — Option A is correct because enabling default encryption on the bucket ensures all objects are encrypted. Option B is wrong because bucket policies do not encrypt data. Option C is wrong because CloudHSM is not required. Option D is wrong because pre-signed URLs do not enforce encryption.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-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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