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DEA-C01 Data Operations and Support Practice Question

This DEA-C01 practice question tests your understanding of data operations and support. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 streaming data to Amazon S3. The data is in JSON format, and each record is approximately 5 KB. The company has set the buffer interval to 60 seconds and the buffer size to 5 MB. However, the data engineer observes that the delivery to S3 is delayed by up to 5 minutes during peak traffic. The engineer wants to reduce the delivery latency to under 1 minute. Which TWO actions should the engineer take? (Choose TWO.)

A
Enable GZIP compression for the delivery stream.
Why wrong: Compression reduces storage size but does not reduce delivery latency.
B
Reduce the buffer size to 1 MB.
A smaller buffer size triggers delivery sooner when the size threshold is reached.
C
Increase the buffer size to 50 MB.
Why wrong: Increasing buffer size delays delivery because it takes longer to fill.
D
Convert the data format to Apache Parquet before delivery.
Why wrong: Conversion adds processing time and does not reduce delivery latency.
E
Reduce the buffer interval to 10 seconds.
A shorter interval triggers more frequent delivery, reducing latency.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Reduce the buffer size to 1 MB.

Option B is correct because reducing the buffer size to 1 MB triggers delivery sooner once the smaller size threshold is met, reducing latency. Option E is correct because reducing the buffer interval to 10 seconds forces Firehose to deliver data more frequently, also reducing latency. Option A is wrong because GZIP compression reduces data volume but does not directly reduce delivery latency; it may even add processing time. Option C is wrong because increasing the buffer size would make it take longer to fill, increasing latency. Option D is wrong because converting to Parquet requires additional processing and does not directly reduce latency; it may increase it.

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.

✗
Enable GZIP compression for the delivery stream.
Why it's wrong here
Compression reduces storage size but does not reduce delivery latency.
✓
Reduce the buffer size to 1 MB.
Why this is correct
A smaller buffer size triggers delivery sooner when the size threshold is reached.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the buffer size to 50 MB.
Why it's wrong here
Increasing buffer size delays delivery because it takes longer to fill.
✗
Convert the data format to Apache Parquet before delivery.
Why it's wrong here
Conversion adds processing time and does not reduce delivery latency.
✓
Reduce the buffer interval to 10 seconds.
Why this is correct
A shorter interval triggers more frequent delivery, reducing latency.
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.

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.

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FAQ

Questions learners often ask

What does this DEA-C01 question test?

Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Reduce the buffer size to 1 MB. — Option B is correct because reducing the buffer size to 1 MB triggers delivery sooner once the smaller size threshold is met, reducing latency. Option E is correct because reducing the buffer interval to 10 seconds forces Firehose to deliver data more frequently, also reducing latency. Option A is wrong because GZIP compression reduces data volume but does not directly reduce delivery latency; it may even add processing time. Option C is wrong because increasing the buffer size would make it take longer to fill, increasing latency. Option D is wrong because converting to Parquet requires additional processing and does not directly reduce latency; it may increase it.

What should I do if I get this DEA-C01 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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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.