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 uses Amazon Kinesis Data Firehose to deliver data to an S3 bucket. The data must be delivered within 60 seconds of ingestion. Currently, the delivery takes 3 minutes due to large buffer sizes. How should the engineer adjust the Firehose configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Decrease the buffer interval to 60 seconds.
Amazon Kinesis Data Firehose delivers data to S3 based on either a buffer size threshold or a buffer interval (in seconds), whichever is reached first. To ensure delivery within 60 seconds, you must decrease the buffer interval to 60 seconds, which forces Firehose to flush data to S3 every 60 seconds regardless of buffer size. The current 3-minute delay is caused by the buffer interval being larger than 60 seconds, so reducing it directly meets the requirement.
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.
✓
Decrease the buffer interval to 60 seconds.
Why this is correct
Lowering the buffer interval triggers delivery sooner, meeting the latency requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the buffer interval to 120 seconds.
Why it's wrong here
Increasing the interval would make delivery slower.
✗
Increase the buffer size to 128 MB.
Why it's wrong here
Larger buffer size delays delivery if data volume is low.
✗
Decrease the buffer size to 1 MB.
Why it's wrong here
Buffer size affects flushing based on data volume, not time; time-based flushing is controlled by buffer interval.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think decreasing the buffer size alone will speed up delivery, but without adjusting the buffer interval, Firehose may still wait up to the default interval (e.g., 300 seconds) before flushing, so both parameters must be considered to meet a time-based requirement.
Detailed technical explanation
How to think about this question
Under the hood, Kinesis Data Firehose uses two independent triggers for delivery: the buffer size (in MB) and the buffer interval (in seconds). The delivery occurs when either condition is met, so setting the buffer interval to 60 seconds ensures a maximum latency of 60 seconds even if the buffer size is not reached. In real-world scenarios, if data arrives slowly, a small buffer size (e.g., 1 MB) might never be filled, making the buffer interval the sole trigger; thus, adjusting the interval is the reliable way to enforce a time-based SLA.
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.
TExam Day Tips
→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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Decrease the buffer interval to 60 seconds. — Amazon Kinesis Data Firehose delivers data to S3 based on either a buffer size threshold or a buffer interval (in seconds), whichever is reached first. To ensure delivery within 60 seconds, you must decrease the buffer interval to 60 seconds, which forces Firehose to flush data to S3 every 60 seconds regardless of buffer size. The current 3-minute delay is caused by the buffer interval being larger than 60 seconds, so reducing it directly meets the requirement.
What should I do if I get this DEA-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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