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 developer is deploying a web application on AWS Elastic Beanstalk. The application requires a fixed IP address for outbound traffic to a third-party API. What is the MOST cost-effective solution?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Launch the environment in a VPC with a NAT Gateway in a public subnet.
Option A is correct because a NATGateway in a public subnet provides a fixed public IP for outbound traffic from EC2 instances in private subnets. Option B is wrong because an Internet Gateway does not provide a fixed IP. Option C is wrong because Elastic IPs attached to instances are not managed by Elastic Beanstalk easily. Option D is wrong because a VPC endpoint is for private connectivity to AWS services, not third-party APIs.
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.
✓
Launch the environment in a VPC with a NAT Gateway in a public subnet.
Why this is correct
NATGateway provides a fixed public IP for outbound traffic.
Internet Gateway allows inbound and outbound but does not provide a fixed IP.
✗
Use a VPC endpoint for the third-party API.
Why it's wrong here
VPC endpoints are for AWS services, not third-party.
✗
Assign an Elastic IP to each EC2 instance.
Why it's wrong here
Not managed by Elastic Beanstalk, and not cost-effective.
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.
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: Launch the environment in a VPC with a NAT Gateway in a public subnet. — Option A is correct because a NAT Gateway in a public subnet provides a fixed public IP for outbound traffic from EC2 instances in private subnets. Option B is wrong because an Internet Gateway does not provide a fixed IP. Option C is wrong because Elastic IPs attached to instances are not managed by Elastic Beanstalk easily. Option D is wrong because a VPC endpoint is for private connectivity to AWS services, not third-party APIs.
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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