- A
The SQS dead-letter queue is not configured.
Why wrong: DLQ is for storing failed messages after retries, not for timeout issues.
- B
The SQS queue visibility timeout is too short.
Why wrong: Visibility timeout affects when messages reappear, not the Lambda execution timeout.
- C
The Lambda function timeout is set too low.
The default timeout is 3 seconds; increasing it resolves the timeout.
- D
The Lambda function's reserved concurrency is set to zero.
Why wrong: Reserved concurrency limits concurrent executions, not timeout.
Question 1,108 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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 notices that an AWS Lambda function is timing out after 3 seconds. The function processes messages from an SQS queue. 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 Lambda function timeout is set too low.
The Lambda function is timing out after 3 seconds, which matches the default Lambda timeout. The most likely cause is that the function timeout is set too low (3 seconds) and needs to be increased to accommodate processing time. Option B (SQS visibility timeout) affects message redelivery but not the Lambda execution timeout. Option D (reserved concurrency set to zero) would prevent any invocations, not cause a timeout after 3 seconds. Option A (dead-letter queue not configured) does not cause timeouts; it only affects where failed messages go.
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 SQS dead-letter queue is not configured.
Why it's wrong here
DLQ is for storing failed messages after retries, not for timeout issues.
- ✗
The SQS queue visibility timeout is too short.
Why it's wrong here
Visibility timeout affects when messages reappear, not the Lambda execution timeout.
- ✓
The Lambda function timeout is set too low.
Why this is correct
The default timeout is 3 seconds; increasing it resolves the timeout.
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.
- ✗
The Lambda function's reserved concurrency is set to zero.
Why it's wrong here
Reserved concurrency limits concurrent executions, not timeout.
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.
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 Lambda function timeout is set too low. — The Lambda function is timing out after 3 seconds, which matches the default Lambda timeout. The most likely cause is that the function timeout is set too low (3 seconds) and needs to be increased to accommodate processing time. Option B (SQS visibility timeout) affects message redelivery but not the Lambda execution timeout. Option D (reserved concurrency set to zero) would prevent any invocations, not cause a timeout after 3 seconds. Option A (dead-letter queue not configured) does not cause timeouts; it only affects where failed messages go.
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
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