- A
Amazon Kinesis Data Streams
Why wrong: Requires managing shards and consumers.
- B
AWS Lambda
Why wrong: Lambda is not a buffer service.
- C
Amazon Kinesis Data Firehose
Firehose provides serverless buffering and delivery to S3.
- D
Amazon SQS
Why wrong: SQS is not optimized for high-throughput streaming.
SAP-C02 Design for New Solutions Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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 is designing a new solution to ingest real-time clickstream data from a website. The data volume varies from 100 to 100,000 events per second. The solution must buffer the data for up to 5 minutes and then deliver it to Amazon S3 for analysis. The company wants to minimize operational overhead and cost. Which service should be used to buffer the data?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Amazon Kinesis Data Firehose
Amazon Kinesis Data Firehose is the correct choice because it is a fully managed service designed to ingest streaming data, buffer it for configurable durations (up to 15 minutes by default, but easily set to 5 minutes), and automatically deliver it to destinations like Amazon S3. It handles variable data volumes (100 to 100,000 events per second) without requiring manual scaling, minimizing operational overhead and cost compared to alternatives.
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.
- ✗
Amazon Kinesis Data Streams
Why it's wrong here
Requires managing shards and consumers.
- ✗
AWS Lambda
Why it's wrong here
Lambda is not a buffer service.
- ✓
Amazon Kinesis Data Firehose
Why this is correct
Firehose provides serverless buffering and delivery to S3.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon SQS
Why it's wrong here
SQS is not optimized for high-throughput streaming.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Kinesis Data Streams (which requires custom consumers and scaling management) with Kinesis Data Firehose (which is purpose-built for buffering and automated delivery to S3), leading them to choose the more complex option A.
Detailed technical explanation
How to think about this question
Kinesis Data Firehose uses a buffer interval (default 60 seconds, configurable up to 900 seconds) and a buffer size (default 5 MB) to accumulate records before writing to S3. Under the hood, it automatically scales the underlying shard-like resources (called 'provisioned capacity' or 'on-demand') to handle throughput spikes, and it can compress data (e.g., GZIP) and encrypt it with SSE-S3 or KMS before delivery. In a real-world scenario, if the clickstream data exceeds the buffer size before 5 minutes, Firehose will flush early to prevent memory exhaustion, ensuring no data loss.
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 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.
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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Design for New Solutions — This question tests Design for New Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon Kinesis Data Firehose — Amazon Kinesis Data Firehose is the correct choice because it is a fully managed service designed to ingest streaming data, buffer it for configurable durations (up to 15 minutes by default, but easily set to 5 minutes), and automatically deliver it to destinations like Amazon S3. It handles variable data volumes (100 to 100,000 events per second) without requiring manual scaling, minimizing operational overhead and cost compared to alternatives.
What should I do if I get this SAP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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