DVA-C02 Development with AWS Services Practice Question
This DVA-C02 practice question tests your understanding of development with aws services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 runs a microservices architecture on Amazon ECS with Fargate. Each service exposes an HTTP API and needs to be accessible only from the company's internal network via a VPN. The services are deployed in private subnets. What is the MOST secure and scalable way to expose these services?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a VPC Endpoint service powered by PrivateLink and a Network Load Balancer in front of the services.
Correct: D. AWS PrivateLink with a Network Load Balancer allows you to expose services privately within your VPC without internet access. Option A is wrong because ALB in public subnets exposes services to the internet. Option B is wrong because Internet Gateway is for public access. Option C is wrong because NAT Gateway is for outbound traffic, not inbound.
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.
✓
Create a VPC Endpoint service powered by PrivateLink and a Network Load Balancer in front of the services.
Why this is correct
PrivateLink allows private connectivity via NLB without internet exposure.
Place an Application Load Balancer in public subnets and point to the services' target groups.
Why it's wrong here
ALB in public subnets is internet-facing, not secure for internal-only access.
✗
Use a NAT Gateway to allow inbound traffic from the VPN to the services.
Why it's wrong here
NATGateway is for outbound traffic only; inbound is not supported.
✗
Use an Internet Gateway and route traffic from the VPN to the services.
Why it's wrong here
Internet Gateway is for public internet, not internal private access.
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: Create a VPC Endpoint service powered by PrivateLink and a Network Load Balancer in front of the services. — Correct: D. AWS PrivateLink with a Network Load Balancer allows you to expose services privately within your VPC without internet access. Option A is wrong because ALB in public subnets exposes services to the internet. Option B is wrong because Internet Gateway is for public access. Option C is wrong because NAT Gateway is for outbound traffic, not inbound.
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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Question Discussion
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