- A
Request a concurrency limit increase from AWS Support
Why wrong: Requesting a concurrency limit increase is unnecessary because the default concurrency limit is already 1,000, which meets the requirement. This option does not prevent throttling for a specific function; it increases the account-wide limit, but no increase is needed.
- B
Enable provisioned concurrency
Why wrong: Provisioned concurrency addresses cold starts and ensures initial burst capacity, but does not guarantee a specific concurrency level to avoid throttling. It is not the correct tool for avoiding throttling due to high concurrency.
- C
Use a dead-letter queue (DLQ) to retry throttled requests
Why wrong: Using a dead-letter queue (DLQ) handles failed invocations after throttling or errors, but does not prevent throttling from occurring. It is a recovery mechanism, not a prevention measure.
- D
Set reserved concurrency to 1,000
Setting reserved concurrency to 1,000 guarantees that the Lambda function has its own dedicated concurrency pool of 1,000, preventing throttling as long as the account's regional concurrency limit is at least 1,000 (which it is by default). This ensures capacity for up to 1,000 concurrent invocations.
SAP-C02 Lambda Reserved Concurrency Practice Question
This SAP-C02 practice question tests your understanding of design for new solutions. 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. A key principle to apply: lambda Reserved Concurrency. 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 serverless application using AWS Lambda. The function needs to process files uploaded to an S3 bucket and store metadata in DynamoDB. The solution must handle up to 1,000 concurrent invocations. Which configuration should be used to avoid throttling?
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 reserved concurrency to 1,000
The correct answer is D because setting reserved concurrency to 1,000 ensures that the Lambda function has its own dedicated concurrency pool of 1,000, preventing throttling as long as the account's regional concurrency limit is at least 1,000. Option A is unnecessary since the default limit is already 1,000. Option B (provisioned concurrency) addresses cold starts, not throttling. Option C (DLQ) handles failures after invocation, not prevention of throttling.
Key principle: Lambda Reserved Concurrency
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Request a concurrency limit increase from AWS Support
Why it's wrong here
Requesting a concurrency limit increase is unnecessary because the default concurrency limit is already 1,000, which meets the requirement. This option does not prevent throttling for a specific function; it increases the account-wide limit, but no increase is needed.
- ✗
Enable provisioned concurrency
Why it's wrong here
Provisioned concurrency addresses cold starts and ensures initial burst capacity, but does not guarantee a specific concurrency level to avoid throttling. It is not the correct tool for avoiding throttling due to high concurrency.
- ✗
Use a dead-letter queue (DLQ) to retry throttled requests
Why it's wrong here
Using a dead-letter queue (DLQ) handles failed invocations after throttling or errors, but does not prevent throttling from occurring. It is a recovery mechanism, not a prevention measure.
- ✓
Set reserved concurrency to 1,000
Why this is correct
Setting reserved concurrency to 1,000 guarantees that the Lambda function has its own dedicated concurrency pool of 1,000, preventing throttling as long as the account's regional concurrency limit is at least 1,000 (which it is by default). This ensures capacity for up to 1,000 concurrent invocations.
Related concept
Lambda Reserved Concurrency
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse reserved concurrency with concurrency limits. Reserved concurrency guarantees a specific amount of concurrency for a function, while concurrency limits are account-wide. The question asks to avoid throttling, so reserved concurrency is the correct tool.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Lambda Reserved Concurrency
- Lambda Throttling
- Concurrency Limit
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
Lambda Reserved Concurrency
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.
Review lambda Reserved Concurrency, then practise related SAP-C02 questions on the same topic to reinforce the concept.
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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 — Lambda Reserved Concurrency.
What is the correct answer to this question?
The correct answer is: Set reserved concurrency to 1,000 — The correct answer is D because setting reserved concurrency to 1,000 ensures that the Lambda function has its own dedicated concurrency pool of 1,000, preventing throttling as long as the account's regional concurrency limit is at least 1,000. Option A is unnecessary since the default limit is already 1,000. Option B (provisioned concurrency) addresses cold starts, not throttling. Option C (DLQ) handles failures after invocation, not prevention of throttling.
What should I do if I get this SAP-C02 question wrong?
Review lambda Reserved Concurrency, then practise related SAP-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Lambda Reserved Concurrency
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Last reviewed: Jun 20, 2026
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