Question 1,296 of 1,660
SAP-C02 Design for New Solutions Practice Question
A company is designing a serverless application using AWS Lambda to process incoming files from Amazon S3. Each file is less than 1 MB and processing must complete within 10 seconds. The application must handle bursts of up to 1,000 concurrent invocations. Which configuration will provide the MOST cost-effective solution?
⚠ Common exam trap
Many exam-takers assume reserved or provisioned concurrency is required for high concurrency, but the default account limit already supports 1,000 concurrent executions, and paying extra for guaranteed capacity is wasteful for a sporadic burst workload.
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
✓
Set function memory to 128 MB and leave concurrency at the account default of 1,000.
The default account-level concurrency limit is 1,000 concurrent executions, which meets the burst requirement without additional cost. With files under 1 MB and a 10-second timeout, 128 MB memory is sufficient for lightweight processing, and provisioned or reserved concurrency would incur unnecessary charges since the workload is sporadic and does not require pre-warmed instances.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use provisioned concurrency for 1,000 concurrent executions with 128 MB memory.
Why it's wrong here
Provisioned concurrency incurs additional cost and is not needed for occasional bursts.
- ✗
Place the Lambda function in a VPC with 1,024 MB memory for faster processing.
Why it's wrong here
VPC adds latency and cost; 1,024 MB memory is over-provisioned.
- ✗
Set reserved concurrency to 1,000 and function memory to 256 MB.
Why it's wrong here
Reserved concurrency may prevent scaling for other functions; 256 MB is more than needed.
- ✓
Set function memory to 128 MB and leave concurrency at the account default of 1,000.
Why this is correct
128 MB is sufficient for small files; default concurrency handles bursts.
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 |
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Last reviewed: Jul 4, 2026
This SAP-C02 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 SAP-C02 exam.
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