The answer is that the console uses multipart uploads, which require encryption headers on each part, not just the initial request. When a bucket policy denies s3:PutObject unless the correct encryption header is present, multipart uploads fail because the AWS Management Console initiates a multipart upload for large objects, and each individual part upload must include the encryption header to satisfy the policy. This scenario tests your understanding of how S3 bucket policies interact with multipart uploads and server-side encryption, a common trap on the AWS Certified Security Specialty SCS-C02 exam where candidates overlook that the console’s default behavior for larger files triggers multipart uploads. The key distinction is that a bucket policy can enforce encryption at the object level, but multipart uploads break that enforcement unless headers are applied per part. Memory tip: think “multi-part, multi-header” — each part of a multipart upload needs its own encryption header to pass the policy check.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 S3 bucket that stores financial records. The security team wants to ensure that any object uploaded to the bucket is automatically encrypted with a specific AWS KMS key. The team creates a bucket policy that denies s3:PutObject unless the request includes the correct encryption header. However, some users who upload objects using the AWS Management Console report that their uploads fail. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The console uses multipart uploads, which require encryption headers on each part.
Option A is correct because the AWS Management Console uses multipart uploads for large objects, and multipart uploads require the encryption header to be specified in each part upload. Option B is wrong because the bucket policy can enforce encryption; a KMS key policy is separate. Option C is wrong because S3 Transfer Acceleration does not affect encryption. Option D is wrong because the console respects bucket policies.
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.
✓
The console uses multipart uploads, which require encryption headers on each part.
Why this is correct
Multipart uploads have different API calls; the bucket policy condition must account for them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The KMS key policy does not allow the s3:PutObject operation.
Why it's wrong here
KMS key policy controls use of the key, not the S3 operation.
✗
The console does not support server-side encryption.
Why it's wrong here
The console supports server-side encryption.
✗
S3 Transfer Acceleration is enabled, which bypasses the bucket policy.
Why it's wrong here
Transfer Acceleration does not bypass bucket policies.
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 SCS-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.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The console uses multipart uploads, which require encryption headers on each part. — Option A is correct because the AWS Management Console uses multipart uploads for large objects, and multipart uploads require the encryption header to be specified in each part upload. Option B is wrong because the bucket policy can enforce encryption; a KMS key policy is separate. Option C is wrong because S3 Transfer Acceleration does not affect encryption. Option D is wrong because the console respects bucket policies.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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