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?
The S3 bucket is in a different VPC
Why wrong: S3 is global and not VPC-bound.
The S3 bucket uses SSE-KMS and Firehose does not have KMS permissions
Why wrong: KMS permissions would cause a different error.
The S3 bucket name contains invalid characters
Why wrong: Bucket names are validated at creation.
The IAM role assigned to Firehose lacks s3:PutObject permission
The role must have S3 write permissions.
Answer choices
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
Option C is correct because Firehose uses a trust policy with a service principal but the delivery role must have S3 permissions. Option A is wrong because SSE-KMS requires KMS permissions, not S3 access. Option B is wrong because bucket name is part of the configuration. Option D is wrong because VPC endpoints affect connectivity, not access denied after connection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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
S3 is global and not VPC-bound.
The S3 bucket uses SSE-KMS and Firehose does not have KMS permissions
Why it's wrong here
KMS permissions would cause a different error.
The S3 bucket name contains invalid characters
Why it's wrong here
Bucket names are validated at creation.
The IAM role assigned to Firehose lacks s3:PutObject permission
Why this is correct
The role must have S3 write permissions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
The correct answer is: The IAM role assigned to Firehose lacks s3:PutObject permission — Option C is correct because Firehose uses a trust policy with a service principal but the delivery role must have S3 permissions. Option A is wrong because SSE-KMS requires KMS permissions, not S3 access. Option B is wrong because bucket name is part of the configuration. Option D is wrong because VPC endpoints affect connectivity, not access denied after connection.
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.
Read the scenario before looking for a memorised answer.
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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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