DEA-C01 Data Operations and Support Practice Question
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.)
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.
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.
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.
- ✗
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.
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 |
Go deeper
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.