- A
Assign an Elastic IP to the Lambda function
Why wrong: Lambda functions cannot have Elastic IPs.
- B
Use a Lambda environment variable to store the database endpoint and credentials
Why wrong: This does not address network connectivity.
- C
Place the Lambda function in a public subnet with an internet gateway
Why wrong: This would expose the function to the internet.
- D
Configure the Lambda function to use a VPC with private subnets and a VPC endpoint for RDS
Correct: VPC integration and VPC endpoint allow private access.
Question 590 of 1,000
mediumMultiple ChoiceObjective-mapped
CCSP Practice Question: Using AWS Lambda functions that need to access a…
This CCSP practice question tests your understanding of ccsp exam topics. 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 company is using AWS Lambda functions that need to access a private RDS database. Which configuration allows the Lambda function to connect securely without traversing the internet?
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
✓
Configure the Lambda function to use a VPC with private subnets and a VPC endpoint for RDS
Attaching the Lambda function to a VPC and placing it in private subnets with a VPC endpoint for RDS or a NAT gateway allows private connectivity.
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.
- ✗
Assign an Elastic IP to the Lambda function
Why it's wrong here
Lambda functions cannot have Elastic IPs.
- ✗
Use a Lambda environment variable to store the database endpoint and credentials
Why it's wrong here
This does not address network connectivity.
- ✗
Place the Lambda function in a public subnet with an internet gateway
Why it's wrong here
This would expose the function to the internet.
- ✓
Configure the Lambda function to use a VPC with private subnets and a VPC endpoint for RDS
Why this is correct
Correct: VPC integration and VPC endpoint allow private access.
Related concept
CIDR notation defines the prefix length.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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 CCSP subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this CCSP question test?
CIDR notation defines the prefix length.
What is the correct answer to this question?
The correct answer is: Configure the Lambda function to use a VPC with private subnets and a VPC endpoint for RDS — Attaching the Lambda function to a VPC and placing it in private subnets with a VPC endpoint for RDS or a NAT gateway allows private connectivity.
What should I do if I get this CCSP 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 CCSP subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
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Last reviewed: Jul 4, 2026
This CCSP practice question is part of Courseiva's free ISC2 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 CCSP exam.
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