- A
That the database password has not been rotated.
Why wrong: Password rotation would cause authentication errors, not timeouts.
- B
That the Lambda function's reserved concurrency is not set to zero.
Why wrong: Reserved concurrency would cause throttling, not timeouts.
- C
That the Lambda function has a route to the database via a NAT gateway or VPC endpoint.
If the database is in a private subnet, a NAT gateway is needed for the Lambda function to access it.
- D
That the Lambda function's environment variables are correctly set.
Why wrong: Environment variables affect configuration, not network connectivity.
Question 1,423 of 1,746
SAP-C02 Continuous Improvement for Existing Solutions 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. 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 uses AWS Lambda with a VPC configuration to access an RDS database. After a recent change, the Lambda function times out when connecting to the database. The security group and network ACLs appear correct. What should the company check first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
That the Lambda function has a route to the database via a NAT gateway or VPC endpoint.
When a Lambda function is configured to run inside a VPC, it loses internet access unless a NAT gateway or VPC endpoint is provided. To connect to an RDS database that is also in a VPC, the Lambda function needs a route to the database's subnet. If the function is trying to access the database via its private IP, it must be in the same VPC or have VPC peering/VPN. The most common issue after a change is that the route table or subnet configuration is missing. Therefore, checking that the Lambda function has a route to the database via a NAT gateway (if database is public) or VPC endpoint (if private) is the first step. The other options are secondary: password rotation (A) would cause authentication failure, not timeout; reserved concurrency of zero (B) would prevent invocation entirely; environment variables (D) might cause connection string issues, but timeout suggests network problem.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
That the database password has not been rotated.
Why it's wrong here
Password rotation would cause authentication errors, not timeouts.
- ✗
That the Lambda function's reserved concurrency is not set to zero.
Why it's wrong here
Reserved concurrency would cause throttling, not timeouts.
- ✓
That the Lambda function has a route to the database via a NAT gateway or VPC endpoint.
- ✗
That the Lambda function's environment variables are correctly set.
Why it's wrong here
Environment variables affect configuration, not network connectivity.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
- →
Continuous Improvement for Existing Solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Continuous Improvement for Existing Solutions practice questions
Targeted practice on this topic area only
- →
All SAP-C02 questions
1,746 questions across all exam domains
- →
AWS Certified Solutions Architect Professional SAP-C02 study guide
Full concept coverage aligned to exam objectives
- →
SAP-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related SAP-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Design Solutions for Organizational Complexity practice questions
Practise SAP-C02 questions linked to Design Solutions for Organizational Complexity.
Design for New Solutions practice questions
Practise SAP-C02 questions linked to Design for New Solutions.
Continuous Improvement for Existing Solutions practice questions
Practise SAP-C02 questions linked to Continuous Improvement for Existing Solutions.
Accelerate Workload Migration and Modernization practice questions
Practise SAP-C02 questions linked to Accelerate Workload Migration and Modernization.
SAA-C03 VPC practice questions
Practise SAP-C02 questions linked to SAA-C03 VPC.
SAA-C03 S3 lifecycle policy questions
Practise SAP-C02 questions linked to SAA-C03 S3 lifecycle policy questions.
SAA-C03 RDS Multi-AZ questions
Practise SAP-C02 questions linked to SAA-C03 RDS Multi-AZ questions.
SAA-C03 IAM policy practice questions
Practise SAP-C02 questions linked to SAA-C03 IAM policy.
SAA-C03 Route 53 failover questions
Practise SAP-C02 questions linked to SAA-C03 Route 53 failover questions.
SAA-C03 CloudFront practice questions
Practise SAP-C02 questions linked to SAA-C03 CloudFront.
SAA-C03 NAT gateway questions
Practise SAP-C02 questions linked to SAA-C03 NAT gateway questions.
SAA-C03 VPC endpoint questions
Practise SAP-C02 questions linked to SAA-C03 VPC endpoint questions.
Practice this exam
Start a free SAP-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
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 — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: That the Lambda function has a route to the database via a NAT gateway or VPC endpoint. — When a Lambda function is configured to run inside a VPC, it loses internet access unless a NAT gateway or VPC endpoint is provided. To connect to an RDS database that is also in a VPC, the Lambda function needs a route to the database's subnet. If the function is trying to access the database via its private IP, it must be in the same VPC or have VPC peering/VPN. The most common issue after a change is that the route table or subnet configuration is missing. Therefore, checking that the Lambda function has a route to the database via a NAT gateway (if database is public) or VPC endpoint (if private) is the first step. The other options are secondary: password rotation (A) would cause authentication failure, not timeout; reserved concurrency of zero (B) would prevent invocation entirely; environment variables (D) might cause connection string issues, but timeout suggests network problem.
What should I do if I get this SAP-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SAP-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More SAP-C02 practice questions
- A company wants to automate the migration of on-premises servers to AWS. The migration plan includes discovery, assessme…
- A company is using AWS Organizations with hundreds of accounts. The central IT team needs to deploy a common set of AWS…
- A multinational company operates a multi-account AWS environment using AWS Organizations. The security team needs to enf…
- A company has a multi-account AWS environment with a centralized logging account. The security team needs to analyze VPC…
- A company has multiple AWS accounts and wants to centralize logging of all API calls. Which TWO services should be used…
- Match each AWS compute service to its use case.
Last reviewed: Jun 20, 2026
This SAP-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 SAP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.