DEA-C01 Data Ingestion and Transformation Practice Question
This DEA-C01 practice question tests your understanding of data ingestion and transformation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 Amazon Kinesis Data Firehose to ingest clickstream data from a website into an S3 bucket. The data is then analyzed using Amazon Athena. Recently, the company noticed that Athena queries are returning incomplete results for the last 30 minutes of data. The Firehose delivery stream is configured to buffer data for 60 seconds or 5 MB before delivering to S3. The S3 bucket has a lifecycle policy that transitions objects to Amazon S3 Glacier after 30 days. The IAM role for Firehose has permissions to write to S3 and access a CloudWatch Logs group. The engineer checks the Firehose monitoring and sees that the delivery rate is healthy, but the 'S3.Bytes' metric shows a spike in the last hour. The 'BackupToS3.Bytes' metric is zero. What is the MOST likely cause of the missing data?
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 data is still being buffered in Firehose and has not yet been delivered to S3.
Option A is correct. The buffer settings (60 seconds or 5 MB) mean that data may be held in the buffer for up to 60 seconds before being written to S3. For the last 30 minutes, some data may still be in the buffer and not yet delivered. Athena queries only see data that has been delivered. Option B (lifecycle policy) would not affect recent data. Option C (IAM permissions) would cause errors, not missing data. Option D (backup) is unrelated.
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 lifecycle policy is transitioning data before Athena can query it.
Why it's wrong here
Lifecycle transition to Glacier occurs after 30 days, not within minutes.
✗
The backup is enabled and data is being sent to the backup bucket instead.
Why it's wrong here
Backup is for failed deliveries; the backup metric is zero, so no data is being sent there.
✓
The data is still being buffered in Firehose and has not yet been delivered to S3.
Why this is correct
Firehose buffers data for up to 60 seconds; recent data may still be in transit and not yet queryable by Athena.
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.
✗
The IAM role for Firehose does not have permissions to write to the S3 bucket.
Why it's wrong here
If permissions were missing, Firehose would fail to deliver and show errors.
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
If permissions were missing, Firehose would fail to deliver and show errors.
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 data is still being buffered in Firehose and has not yet been delivered to S3. — Option A is correct. The buffer settings (60 seconds or 5 MB) mean that data may be held in the buffer for up to 60 seconds before being written to S3. For the last 30 minutes, some data may still be in the buffer and not yet delivered. Athena queries only see data that has been delivered. Option B (lifecycle policy) would not affect recent data. Option C (IAM permissions) would cause errors, not missing data. Option D (backup) is unrelated.
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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