- A
The S3 bucket is in a different VPC
Why wrong: Incorrect. VPC differences affect network connectivity, but the error is an S3 access denied, which is an IAM permissions issue.
- B
The S3 bucket uses SSE-KMS and Firehose does not have KMS permissions
Why wrong: Incorrect. SSE-KMS would require KMS permissions, but the error message indicates S3 bucket access denied, not KMS.
- C
The S3 bucket name contains invalid characters
Why wrong: Incorrect. Invalid bucket name characters would cause a configuration error during stream setup, not during delivery.
- D
The IAM role assigned to Firehose lacks s3:PutObject permission
Correct. The IAM role assigned to the Firehose delivery stream must have the s3:PutObject permission to write objects to the S3 bucket. The bucket policy allowing the service principal is not sufficient; the role also needs the appropriate S3 action.
Kinesis Firehose: S3 Access Denied Due to IAM Role
This DEA-C01 practice question tests your understanding of data operations and support. 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 is using Kinesis Data Firehose to deliver data to an S3 bucket. The delivery stream is failing with 'S3 bucket access denied' errors. The bucket policy allows the Firehose service principal. What could be the issue?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The IAM role assigned to Firehose lacks s3:PutObject permission
The correct answer is D. Even though the S3 bucket policy allows the Firehose service principal, Kinesis Data Firehose uses an IAM role to write data. This role must have the s3:PutObject permission. Without it, Firehose will receive an access denied error. Option A is incorrect because VPC differences affect network connectivity, not IAM permissions. Option B is incorrect because SSE-KMS requires KMS permissions, but the error here is specifically about S3 access. Option C is incorrect because bucket name validation occurs during stream creation, not during data delivery.
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 S3 bucket is in a different VPC
Why it's wrong here
Incorrect. VPC differences affect network connectivity, but the error is an S3 access denied, which is an IAM permissions issue.
- ✗
The S3 bucket uses SSE-KMS and Firehose does not have KMS permissions
Why it's wrong here
Incorrect. SSE-KMS would require KMS permissions, but the error message indicates S3 bucket access denied, not KMS.
- ✗
The S3 bucket name contains invalid characters
Why it's wrong here
Incorrect. Invalid bucket name characters would cause a configuration error during stream setup, not during delivery.
- ✓
The IAM role assigned to Firehose lacks s3:PutObject permission
Why this is correct
Correct. The IAM role assigned to the Firehose delivery stream must have the s3:PutObject permission to write objects to the S3 bucket. The bucket policy allowing the service principal is not sufficient; the role also needs the appropriate S3 action.
Related concept
Read the scenario before looking for a memorised answer.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM role assigned to Firehose lacks s3:PutObject permission — The correct answer is D. Even though the S3 bucket policy allows the Firehose service principal, Kinesis Data Firehose uses an IAM role to write data. This role must have the s3:PutObject permission. Without it, Firehose will receive an access denied error. Option A is incorrect because VPC differences affect network connectivity, not IAM permissions. Option B is incorrect because SSE-KMS requires KMS permissions, but the error here is specifically about S3 access. Option C is incorrect because bucket name validation occurs during stream creation, not during data delivery.
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.
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 →
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Last reviewed: Jun 20, 2026
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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