DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. 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 is building a serverless application using AWS Lambda. The Lambda function needs to access a VPC to connect to an RDS database. Which TWO resources must the developer configure to allow the Lambda function to access the VPC?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A security group that allows inbound/outbound traffic to the RDS database.
Options B and D are correct. Option B: Lambda functions must be configured with a VPC subnet to be placed in the VPC. Option D: A security group must be attached to the Lambda function to control traffic. Option A is incorrect because an internet gateway is not needed for private VPC access. Option C is incorrect because a NAT gateway is for outbound internet access, not for accessing RDS within the VPC. Option E is incorrect because an IAM role is for permissions, not network 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.
✗
A NAT gateway in the VPC.
Why it's wrong here
NATgateway is for outbound internet from private subnets; not needed for RDS access.
✓
A security group that allows inbound/outbound traffic to the RDS database.
Why this is correct
Security group acts as a firewall to control traffic between Lambda and RDS.
IAM role is for authentication and authorization, not network connectivity.
✗
An internet gateway attached to the VPC.
Why it's wrong here
Internet gateway provides internet access, not required for VPC internal communication.
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 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.
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 DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Development with AWS Services — This question tests Development with AWS Services — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A security group that allows inbound/outbound traffic to the RDS database. — Options B and D are correct. Option B: Lambda functions must be configured with a VPC subnet to be placed in the VPC. Option D: A security group must be attached to the Lambda function to control traffic. Option A is incorrect because an internet gateway is not needed for private VPC access. Option C is incorrect because a NAT gateway is for outbound internet access, not for accessing RDS within the VPC. Option E is incorrect because an IAM role is for permissions, not network connectivity.
What should I do if I get this DVA-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 DVA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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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.
Question Discussion
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