- A
Lambda will automatically increase reserved concurrency to handle the load.
Why wrong: Reserved concurrency is fixed; it does not auto-increase.
- B
Lambda will reject the invocation because reserved concurrency is too low.
Why wrong: Lambda will still process messages within the limit.
- C
Lambda will scale up to 20 concurrent executions to process all messages quickly.
Why wrong: Reserved concurrency prevents scaling beyond 5.
- D
Lambda will process messages with a maximum of 5 concurrent executions, each processing a batch of messages.
Reserved concurrency limits to 5 concurrent executions.
Question 1,564 of 1,616
Lambda Reserved Concurrency and SQS Batch Processing
This DVA-C02 practice question tests your understanding of development with aws services. 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. 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 developer has written an AWS Lambda function that processes messages from an Amazon SQS queue. The function is configured with a reserved concurrency of 5. The SQS queue has 10,000 messages waiting to be processed. What will happen when the Lambda function is invoked?
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
✓
Lambda will process messages with a maximum of 5 concurrent executions, each processing a batch of messages.
Option D is correct because AWS Lambda integrates with Amazon SQS to poll the queue and invoke the function with batches of messages. The reserved concurrency of 5 caps the maximum number of concurrent executions, so Lambda will process messages with up to 5 concurrent invocations, each receiving a batch of up to 10 messages (default batch size). The remaining messages remain in the queue until they are processed or the visibility timeout expires.
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.
- ✗
Lambda will automatically increase reserved concurrency to handle the load.
Why it's wrong here
Reserved concurrency is fixed; it does not auto-increase.
- ✗
Lambda will reject the invocation because reserved concurrency is too low.
Why it's wrong here
Lambda will still process messages within the limit.
- ✗
Lambda will scale up to 20 concurrent executions to process all messages quickly.
Why it's wrong here
Reserved concurrency prevents scaling beyond 5.
- ✓
Lambda will process messages with a maximum of 5 concurrent executions, each processing a batch of messages.
Why this is correct
Reserved concurrency limits to 5 concurrent executions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Lambda will automatically scale to handle the queue depth, but reserved concurrency is a hard limit that prevents scaling beyond the configured value, leading to throttling rather than rejection or automatic scaling.
Detailed technical explanation
How to think about this question
Lambda uses long polling (with a 20-second wait time by default) to retrieve messages from SQS, and each concurrent execution processes a batch of messages (configurable from 1 to 10). The reserved concurrency acts as a throttle; if the function is at its concurrency limit, SQS messages will remain in the queue and may trigger a Dead Letter Queue after exceeding the maxReceiveCount. In real-world scenarios, setting reserved concurrency too low can cause processing backlogs, while setting it too high may overwhelm downstream resources.
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
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
What to study next
Got this wrong? Here's your next step.
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Development with AWS Services — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Lambda will process messages with a maximum of 5 concurrent executions, each processing a batch of messages. — Option D is correct because AWS Lambda integrates with Amazon SQS to poll the queue and invoke the function with batches of messages. The reserved concurrency of 5 caps the maximum number of concurrent executions, so Lambda will process messages with up to 5 concurrent invocations, each receiving a batch of up to 10 messages (default batch size). The remaining messages remain in the queue until they are processed or the visibility timeout expires.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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
This DVA-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 DVA-C02 exam.
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