DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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. A data engineer is setting up an Amazon Kinesis Data Firehose delivery stream that writes to an S3 bucket named 'example-bucket'. The IAM role assumed by Firehose has the attached policy shown. When testing, the Firehose delivery stream fails with an access denied error. 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 IAM policy is missing the s3:AbortMultipartUpload and s3:ListBucket actions.
The correct answer is D. Kinesis Data Firehose requires the s3:AbortMultipartUpload and s3:ListBucket permissions in addition to s3:PutObject to successfully write data to an S3 bucket. The IAM policy shown only grants s3:PutObject and s3:GetObject, so without these missing actions, the delivery stream fails with access denied. Option A is incorrect because enabling server-side encryption on the S3 bucket does not inherently cause access denial if the IAM role has the necessary permissions; the issue here is the missing S3 actions. Option B is incorrect because the policy does not involve KMS keys, and the error is not related to encryption key access. Option C is incorrect because there is no indication that the bucket policy explicitly denies the Firehose service principal; the problem is the IAM role's insufficient 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.
✗
The S3 bucket has server-side encryption enabled that needs additional permissions.
Why it's wrong here
No encryption is shown in the exhibit.
✗
The IAM role does not have permission to use AWS KMS keys.
Why it's wrong here
No KMS key is referenced.
✗
The bucket policy denies access from the Firehose service principal.
Why it's wrong here
No bucket policy is shown.
✓
The IAM policy is missing the s3:AbortMultipartUpload and s3:ListBucket actions.
Why this is correct
Firehose uses multipart uploads and needs these permissions.
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.
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.
Trap categories for this question
Command / output trap
No encryption is shown in the exhibit.
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.
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM policy is missing the s3:AbortMultipartUpload and s3:ListBucket actions. — The correct answer is D. Kinesis Data Firehose requires the s3:AbortMultipartUpload and s3:ListBucket permissions in addition to s3:PutObject to successfully write data to an S3 bucket. The IAM policy shown only grants s3:PutObject and s3:GetObject, so without these missing actions, the delivery stream fails with access denied. Option A is incorrect because enabling server-side encryption on the S3 bucket does not inherently cause access denial if the IAM role has the necessary permissions; the issue here is the missing S3 actions. Option B is incorrect because the policy does not involve KMS keys, and the error is not related to encryption key access. Option C is incorrect because there is no indication that the bucket policy explicitly denies the Firehose service principal; the problem is the IAM role's insufficient permissions.
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.
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Question Discussion
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