- A
Increase the Lambda function's reserved concurrency to the maximum allowed.
Why wrong: This may help with throttling but does not decouple the EC2 instances; requests can still be lost if Lambda is unavailable.
- B
Place API Gateway in front of Lambda and have EC2 send requests to API Gateway.
Why wrong: API Gateway adds latency and still uses synchronous invocation; Lambda may still throttle.
- C
Use Amazon Kinesis Data Streams instead of Lambda to process the payload.
Why wrong: Kinesis is for real-time streaming analytics; the requirement is to store in S3, and Kinesis adds complexity.
- D
Have the EC2 instances send messages to an Amazon SQS queue, and configure the SQS queue as an event source for the Lambda function.
SQS decouples the producers from consumers, provides a buffer, and Lambda can poll at its own pace, reducing throttling.
DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs a production application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application receives high traffic and needs to process incoming HTTP requests, store the request payload in an S3 bucket for auditing, and return a response. The development team uses AWS Lambda to process the payload. The team wants to ensure that the solution is scalable, fault-tolerant, and decoupled. The current approach is to have the EC2 instances send requests directly to the Lambda function via the AWS SDK. However, the team notices that during traffic spikes, some requests are lost and the Lambda function throttles. What should the team do to improve the architecture?
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
Have the EC2 instances send messages to an Amazon SQS queue, and configure the SQS queue as an event source for the Lambda function.
Option C is correct because using SQS decouples the EC2 instances from Lambda, provides buffering, and reduces throttling. Option A is incorrect because increasing Lambda concurrency may not solve the loss of requests; requests can still be dropped if Lambda is overwhelmed. Option B is incorrect because API Gateway still requires synchronous invocation and may still cause throttling. Option D is incorrect because Kinesis is for real-time streaming, not ideal for simple request queuing.
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.
- ✗
Increase the Lambda function's reserved concurrency to the maximum allowed.
Why it's wrong here
This may help with throttling but does not decouple the EC2 instances; requests can still be lost if Lambda is unavailable.
- ✗
Place API Gateway in front of Lambda and have EC2 send requests to API Gateway.
Why it's wrong here
API Gateway adds latency and still uses synchronous invocation; Lambda may still throttle.
- ✗
Use Amazon Kinesis Data Streams instead of Lambda to process the payload.
Why it's wrong here
Kinesis is for real-time streaming analytics; the requirement is to store in S3, and Kinesis adds complexity.
- ✓
Have the EC2 instances send messages to an Amazon SQS queue, and configure the SQS queue as an event source for the Lambda function.
Why this is correct
SQS decouples the producers from consumers, provides a buffer, and Lambda can poll at its own pace, reducing throttling.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: Have the EC2 instances send messages to an Amazon SQS queue, and configure the SQS queue as an event source for the Lambda function. — Option C is correct because using SQS decouples the EC2 instances from Lambda, provides buffering, and reduces throttling. Option A is incorrect because increasing Lambda concurrency may not solve the loss of requests; requests can still be dropped if Lambda is overwhelmed. Option B is incorrect because API Gateway still requires synchronous invocation and may still cause throttling. Option D is incorrect because Kinesis is for real-time streaming, not ideal for simple request queuing.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 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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