The answer is that the upload failed because the S3 bucket policy condition requires the `s3:x-amz-server-side-encryption` header to be set to `AES256`, but the upload did not include that encryption header. This is a classic example of how to enforce encryption S3 bucket policy using a condition block that both mandates the presence of the header and its specific value—without the header, the request is denied even if the role has PutObject permissions. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how bucket policies can enforce server-side encryption at upload time, a common trap where candidates assume permissions alone are sufficient. Remember, the policy’s `StringNotEquals` condition denies any request missing the required encryption header, so the upload must explicitly include `x-amz-server-side-encryption: AES256`. Memory tip: “No header, no upload—AES256 must be declared.”
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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.
Refer to the exhibit. An S3 bucket policy is shown. A data engineer using the DataEngineerRole tries to upload an object to s3://example-bucket/data/report.csv with SSE-S3 encryption. The upload fails. 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 condition requires SSE-S3 encryption header, but the upload did not include it.
Option D is correct because the condition s3:x-amz-server-side-encryption: AES256 requires SSE-S3, but the policy also requires that encryption header be present. Option A is wrong because the role has GetObject and PutObject permissions. Option B is wrong because the resource is data/*, which should match. Option C is wrong because the policy allows the role.
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 resource ARN does not match the object.
Why it's wrong here
The ARN matches the object path.
✗
The role does not have s3:PutObject permission.
Why it's wrong here
The policy grants s3:PutObject.
✓
The condition requires SSE-S3 encryption header, but the upload did not include it.
Why this is correct
The condition requires the encryption header to be present and set to AES256.
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 principal is not authorized.
Why it's wrong here
The principal is the DataEngineerRole.
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 DEA-C01 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 Security and Governance — This question tests Data Security and Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The condition requires SSE-S3 encryption header, but the upload did not include it. — Option D is correct because the condition s3:x-amz-server-side-encryption: AES256 requires SSE-S3, but the policy also requires that encryption header be present. Option A is wrong because the role has GetObject and PutObject permissions. Option B is wrong because the resource is data/*, which should match. Option C is wrong because the policy allows the role.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A data engineer needs to ensure that data in an S3 bucket is encrypted at rest. The bucket policy includes a condition that denies PutObject requests if the object is not encrypted. Which S3 encryption feature does this enforce?
easy
A.S3 Object Lock
B.S3 MFA Delete
C.S3 Default Encryption
✓ D.S3 Bucket Policy
Why D: Option D is correct because S3 bucket policies can require server-side encryption by denying PutObject without encryption headers. Option A (default encryption) is a bucket-level setting that automatically encrypts objects, but it does not enforce encryption via policy. Option B (object lock) prevents deletion. Option C (MFA delete) requires multi-factor authentication.
Variation 2. A data engineer needs to ensure that all data in an S3 bucket is encrypted at rest. The bucket contains objects uploaded by various applications. What is the simplest method to enforce encryption for all new objects?
easy
A.Enable S3 Block Public Access to block public access to the bucket.
B.Enable default encryption on the S3 bucket using S3-Managed Keys (SSE-S3).
C.Enable S3 Object Lock on the bucket.
✓ D.Configure an S3 bucket policy that denies PutObject requests without the x-amz-server-side-encryption header.
Why D: Option B is correct because S3 Bucket Policies can enforce encryption by denying PutObject requests that do not include the x-amz-server-side-encryption header. Option A is wrong because default encryption applies only if the upload request does not specify encryption headers; it does not enforce encryption for requests that specify 'None'. Option C is wrong because enabling S3 Block Public Access does not enforce encryption. Option D is wrong because S3 Object Lock prevents deletion but does not enforce encryption.
Variation 3. A data engineer needs to ensure that all data stored in an S3 bucket is encrypted at rest. Which S3 bucket policy condition key should be used to enforce encryption using AWS KMS?
Why D: Option A is correct because the s3:x-amz-server-side-encryption-aws-kms-key-id condition key can be used to require a specific KMS key. Option B is wrong because s3:x-amz-server-side-encryption only checks for encryption, not the specific key. Option C is wrong because kms:EncryptionContext is for KMS-level conditions. Option D is wrong because s3:x-amz-acl is for access control lists.
Last reviewed: Jun 20, 2026
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This DEA-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DEA-C01 exam.
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