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. An IAM policy is attached to an EC2 instance role that runs a data ingestion application. The application reads files from an S3 bucket 'data-lake-primary' and sends records to a Kinesis stream named 'clickstream'. The application is failing with an 'AccessDenied' error when trying to read from S3. 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.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy does not include the s3:ListBucket permission.
Option C is correct. The policy allows s3:GetObject but the resource is specified with a trailing slash and wildcard (/*). If the application is trying to read an object in a subfolder, the policy may still work, but the error could be due to missing s3:ListBucket permission for the bucket itself when the application lists objects. The most common cause is that the application is trying to list the bucket (s3:ListBucket) which is not allowed. Option A is wrong because the stream name is correct. Option B is wrong because the actions are allowed. Option D is wrong because the policy is attached to 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 actions are specified incorrectly; they should be s3:GetObject and s3:PutObject only.
Why it's wrong here
Actions are correct.
✗
The policy is not attached to the EC2 instance role.
Why it's wrong here
The question states it is attached.
✗
The Kinesis stream name is incorrect.
Why it's wrong here
The stream name matches the policy resource.
✓
The policy does not include the s3:ListBucket permission.
Why this is correct
Reading objects often requires ListBucket permission for the bucket.
Clue confirmation
The clue words "most likely", "primary" 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.
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 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 policy does not include the s3:ListBucket permission. — Option C is correct. The policy allows s3:GetObject but the resource is specified with a trailing slash and wildcard (/*). If the application is trying to read an object in a subfolder, the policy may still work, but the error could be due to missing s3:ListBucket permission for the bucket itself when the application lists objects. The most common cause is that the application is trying to list the bucket (s3:ListBucket) which is not allowed. Option A is wrong because the stream name is correct. Option B is wrong because the actions are allowed. Option D is wrong because the policy is attached to 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", "primary". 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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