- A
The API Gateway endpoint is not publicly accessible due to a resource policy.
Why wrong: The default API is public unless a resource policy denies access.
- B
The Lambda function's code is throwing an unhandled exception before it can log.
Why wrong: No logs indicate the function was invoked.
- C
The Lambda function has reached the concurrency limit.
Why wrong: The function is not being invoked at all, so concurrency is not the issue.
- D
The API Gateway integration type is misconfigured; the SAM template should use 'AWS::Serverless::Function' event source instead of manual Swagger integration.
The manual Swagger integration may conflict with the event source, causing incorrect integration.
Question 633 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 is deploying a serverless application using AWS SAM. The application includes an API Gateway REST API and several Lambda functions. The developer runs 'sam deploy' and the deployment succeeds. However, when the developer tests the API endpoint using curl, the request times out. The CloudWatch logs for the Lambda function show that the function is not being invoked. The API Gateway logs are not enabled. The developer checks the API Gateway console and sees that the integration type is 'AWS Service' instead of 'Lambda Function'. The developer used the following SAM template snippet:
Resources: MyApi: Type: AWS::Serverless::Api Properties: StageName: Prod DefinitionBody: swagger: 2.0 info: title: My API paths: /items: get: x-amazon-apigateway-integration: type: aws_proxy uri: !Sub arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${MyFunction.Arn}/invocations responses: {} MyFunction: Type: AWS::Serverless::Function Properties: CodeUri: ./src Handler: index.handler Runtime: nodejs14.x Events: ApiEvent: Type: Api Properties: RestApiId: !Ref MyApi Path: /items Method: GET
What is the most likely cause of the timeout?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
The API Gateway integration type is misconfigured; the SAM template should use 'AWS::Serverless::Function' event source instead of manual Swagger integration.
The SAM template defines the API using both the 'AWS::Serverless::Api' resource with a Swagger definition inline and the 'AWS::Serverless::Function' with an Api event. This may cause a conflict or incorrect configuration. Option D is correct: the 'x-amazon-apigateway-integration' type is set to 'aws_proxy' but the URI is incorrect. However, the API Gateway integration type shown as 'AWS Service' indicates that the integration was not properly set up. The most likely cause is that the SAM template incorrectly defines the integration, leading to a misconfiguration. Option A is wrong because the timeout is not due to Lambda limits. Option B is wrong because the code is not invoked. Option C is wrong because the API is correctly set up for public access.
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.
- ✗
The API Gateway endpoint is not publicly accessible due to a resource policy.
Why it's wrong here
The default API is public unless a resource policy denies access.
- ✗
The Lambda function's code is throwing an unhandled exception before it can log.
Why it's wrong here
No logs indicate the function was invoked.
- ✗
The Lambda function has reached the concurrency limit.
Why it's wrong here
The function is not being invoked at all, so concurrency is not the issue.
- ✓
The API Gateway integration type is misconfigured; the SAM template should use 'AWS::Serverless::Function' event source instead of manual Swagger integration.
Why this is correct
The manual Swagger integration may conflict with the event source, causing incorrect integration.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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.
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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Troubleshooting and Optimization — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The API Gateway integration type is misconfigured; the SAM template should use 'AWS::Serverless::Function' event source instead of manual Swagger integration. — The SAM template defines the API using both the 'AWS::Serverless::Api' resource with a Swagger definition inline and the 'AWS::Serverless::Function' with an Api event. This may cause a conflict or incorrect configuration. Option D is correct: the 'x-amazon-apigateway-integration' type is set to 'aws_proxy' but the URI is incorrect. However, the API Gateway integration type shown as 'AWS Service' indicates that the integration was not properly set up. The most likely cause is that the SAM template incorrectly defines the integration, leading to a misconfiguration. Option A is wrong because the timeout is not due to Lambda limits. Option B is wrong because the code is not invoked. Option C is wrong because the API is correctly set up for public access.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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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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