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 ingesting log files from multiple EC2 instances into Amazon S3 using the CloudWatch agent. The logs are delivered to a CloudWatch Logs group, and a subscription filter sends them to a Lambda function for transformation, then to Firehose. The Firehose stream is configured with a buffer interval of 60 seconds and buffer size of 5 MB. The logs are critical and must be available in S3 within 5 minutes. What is the most cost-effective way to reduce the delivery latency?
Replace Firehose with Amazon Kinesis Data Streams
Why wrong: KDS adds cost and requires additional consumers.
Increase the buffer size to 10 MB
Why wrong: Larger buffer size increases latency.
Increase the buffer interval to 120 seconds
Why wrong: Increases latency.
Decrease the buffer interval to 10 seconds
Lower buffer interval reduces delivery latency.
Answer choices
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 10 seconds
Option D is correct because reducing the buffer interval from 60 to 10 seconds directly reduces latency without adding significant cost. Option A (increase buffer size) would increase latency. Option B (increase buffer interval) worsens latency. Option C (change to Kinesis Data Streams) adds cost and complexity.
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.
Replace Firehose with Amazon Kinesis Data Streams
Why it's wrong here
KDS adds cost and requires additional consumers.
Increase the buffer size to 10 MB
Why it's wrong here
Larger buffer size increases latency.
Increase the buffer interval to 120 seconds
Why it's wrong here
Increases latency.
Decrease the buffer interval to 10 seconds
Why this is correct
Lower buffer interval reduces delivery latency.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 Ingestion and Transformation — This question tests Data Ingestion and Transformation — Read the scenario before looking for a memorised answer..
The correct answer is: Decrease the buffer interval to 10 seconds — Option D is correct because reducing the buffer interval from 60 to 10 seconds directly reduces latency without adding significant cost. Option A (increase buffer size) would increase latency. Option B (increase buffer interval) worsens latency. Option C (change to Kinesis Data Streams) adds cost and complexity.
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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