- A
The Lambda function does not have the required VPC permissions to access the RDS instance.
Why wrong: Lambda in a VPC can access RDS via the VPC without extra permissions; the issue is with SQS access.
- B
The VPC does not have a NAT gateway, so the Lambda function cannot poll the SQS queue.
Lambda in a VPC needs a NAT gateway to access public endpoints like SQS; without it, SQS polling fails, causing timeouts.
- C
The Lambda function timeout should be increased to accommodate database query time.
Why wrong: The query time is 2 seconds, which is within the 3-second timeout; the issue is network connectivity to SQS.
- D
The RDS instance is under-provisioned and causing slow queries.
Why wrong: The query time is 2 seconds, which is acceptable; the timeouts are due to SQS polling failure.
SAP-C02 Lambda VPC Access Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: lambda VPC Access. 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 uses AWS Lambda functions within a VPC to process data from an Amazon SQS queue. The Lambda functions frequently timeout with the error 'Task timed out after 3.00 seconds'. The functions perform database operations on an RDS instance in the same VPC. The average database query takes 2 seconds. What is the MOST likely cause of the timeouts?
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 VPC does not have a NAT gateway, so the Lambda function cannot poll the SQS queue.
Option B is correct because Lambda functions in a VPC require a NAT gateway or VPC endpoints to access the SQS API, which is outside the VPC. Without a NAT gateway, the function cannot poll the SQS queue, causing timeouts. Option A is wrong because Lambda can access RDS within the same VPC without special permissions. Option C is wrong because the timeout is due to SQS polling failure, not the database query time. Option D is wrong because the RDS instance is under-provisioned would cause slow queries, but the error is a timeout after exactly 3 seconds, indicating the function is waiting on something else (SQS polling).
Key principle: Lambda VPC Access
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 Lambda function does not have the required VPC permissions to access the RDS instance.
Why it's wrong here
Lambda in a VPC can access RDS via the VPC without extra permissions; the issue is with SQS access.
- ✓
The VPC does not have a NAT gateway, so the Lambda function cannot poll the SQS queue.
- ✗
The Lambda function timeout should be increased to accommodate database query time.
Why it's wrong here
The query time is 2 seconds, which is within the 3-second timeout; the issue is network connectivity to SQS.
- ✗
The RDS instance is under-provisioned and causing slow queries.
Why it's wrong here
The query time is 2 seconds, which is acceptable; the timeouts are due to SQS polling failure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The timeout occurs because the Lambda function cannot reach the SQS API from within the VPC without a NAT gateway or VPC endpoint. The database query time is irrelevant here.
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 VPC Access
- NAT Gateway
- SQS Polling
- Task Timeout
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 VPC Access
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.
Visual reference
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.
Review lambda VPC Access, then practise related SAP-C02 questions on the same topic to reinforce the concept.
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Continuous Improvement for Existing Solutions — study guide chapter
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FAQ
Questions learners often ask
What does this SAP-C02 question test?
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Lambda VPC Access.
What is the correct answer to this question?
The correct answer is: The VPC does not have a NAT gateway, so the Lambda function cannot poll the SQS queue. — Option B is correct because Lambda functions in a VPC require a NAT gateway or VPC endpoints to access the SQS API, which is outside the VPC. Without a NAT gateway, the function cannot poll the SQS queue, causing timeouts. Option A is wrong because Lambda can access RDS within the same VPC without special permissions. Option C is wrong because the timeout is due to SQS polling failure, not the database query time. Option D is wrong because the RDS instance is under-provisioned would cause slow queries, but the error is a timeout after exactly 3 seconds, indicating the function is waiting on something else (SQS polling).
What should I do if I get this SAP-C02 question wrong?
Review lambda VPC Access, then practise related SAP-C02 questions on the same topic to reinforce the concept.
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?
Lambda VPC Access
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Last reviewed: Jun 20, 2026
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