The answer is no, the download will fail because the request does not include the required encryption header. When an object is stored with SSE-S3, AWS S3 enforces that any download request must include the `x-amz-server-side-encryption` header, even if the user has `s3:GetObject` permissions. Without this header, S3 rejects the request with a `400 Bad Request` error, as the service requires explicit acknowledgment of the encryption context for SSE-S3 objects. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how S3 encryption headers interact with IAM policies—a common trap is assuming IAM permissions alone guarantee access. Remember that SSE-S3 is server-side encryption managed by S3, but the API still demands the header for GET requests to confirm the client intends to decrypt the object. A useful memory tip: "No header, no download—SSE-S3 still needs the key in the request."
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 data engineer attaches the above IAM policy to an IAM user. The user tries to download an object from my-bucket using the AWS CLI without specifying SSE headers. The object is stored with SSE-S3. Will the download succeed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No, because the request does not include the required encryption header.
Option B is correct because when an object is stored with SSE-S3, AWS S3 requires that any request to download it without specifying the `x-amz-server-side-encryption` header (or the equivalent CLI parameter) will fail. The IAM policy grants `s3:GetObject` but does not override the S3 API's requirement for the encryption header to be present in the request. Without the header, S3 rejects the request with a `400 Bad Request` error, even though the user has the necessary IAM permissions.
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.
✗
No, because the object is encrypted and the user does not have decrypt permission.
Why it's wrong here
SSE-S3 does not require separate decrypt permission.
✓
No, because the request does not include the required encryption header.
Why this is correct
The condition requires the request to have x-amz-server-side-encryption: AES256.
Related concept
Read the scenario before looking for a memorised answer.
✗
Yes, because the object is encrypted with SSE-S3, which uses AES256.
Why it's wrong here
The condition is on the request header, not the object encryption.
✗
Yes, because the policy allows s3:GetObject on the bucket.
Why it's wrong here
The condition restricts the Allow.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume SSE-S3 decryption is fully transparent and that any `s3:GetObject` permission suffices, overlooking the S3 API's requirement for the encryption header on GET requests for SSE-S3 objects.
Detailed technical explanation
How to think about this question
Under the hood, SSE-S3 encrypts objects at rest using AES-256, but the S3 API requires the `x-amz-server-side-encryption` header (set to `AES256`) on GET requests to enforce consistent encryption context. This is a security measure to ensure clients explicitly acknowledge encryption, preventing accidental exposure of encrypted data. In real-world scenarios, this behavior is critical when using cross-account access or when objects are uploaded with SSE-S3 but downloaded without the header, causing silent failures that are often misdiagnosed as permission issues.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Data Store Management — This question tests Data Store Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No, because the request does not include the required encryption header. — Option B is correct because when an object is stored with SSE-S3, AWS S3 requires that any request to download it without specifying the `x-amz-server-side-encryption` header (or the equivalent CLI parameter) will fail. The IAM policy grants `s3:GetObject` but does not override the S3 API's requirement for the encryption header to be present in the request. Without the header, S3 rejects the request with a `400 Bad Request` error, even though the user has the necessary IAM permissions.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 applies the above IAM policy to a user. The user attempts to upload an object to the bucket 'my-data-lake' without specifying server-side encryption. What will happen?
easy
A.The upload fails only if the bucket has a default encryption setting
B.The upload succeeds if the bucket policy allows unencrypted uploads
C.The upload succeeds because the policy allows s3:PutObject
✓ D.The upload fails because the condition requires encryption
Why D: The IAM policy includes a condition that requires the `s3:x-amz-server-side-encryption` header to be present with a value of `AES256`. When the user attempts to upload an object without specifying server-side encryption, the condition is not satisfied, so the `s3:PutObject` permission is denied. This causes the upload to fail, regardless of any bucket default encryption settings or bucket policies.
Variation 2. A data engineer applies the above IAM policy to an IAM user. The user attempts to download an object from the bucket 'example-bucket' that is encrypted with SSE-S3 (AES256). Will the request succeed?
medium
A.Yes, but only if the user also has s3:ListBucket permission.
B.No, because the policy requires the encryption to be specified in the request.
✓ C.Yes, because the object is encrypted with SSE-S3 which uses AES256.
D.No, because the policy does not allow the s3:GetObject action for encrypted objects.
Why C: Option A is correct because the condition requires the object to be encrypted with AES256, and SSE-S3 uses AES256. Option B is incorrect because the condition checks the encryption header, not the key type. Option C is incorrect because the condition is satisfied. Option D is incorrect because the condition is satisfied.
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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.
Question Discussion
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