SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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.
An application running on EC2 instances sends large amounts of data to an S3 bucket. The SysOps administrator wants to reduce data transfer costs while ensuring the traffic stays within AWS. 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
✓
Create a VPC Endpoint for S3 (Gateway type) and use it from the EC2 instances.
Option B is correct because using a VPC Endpoint for S3 allows traffic to stay within the AWS network, avoiding internet data transfer costs. Option A is incorrect because NAT Gateways incur charges for data processing and transfer. Option C is incorrect because S3 Transfer Acceleration is for faster uploads, not cost savings. Option D is incorrect because Direct Connect is a dedicated connection that incurs monthly fees and is overkill for this use case.
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.
✗
Set up an AWS Direct Connect connection.
Why it's wrong here
Direct Connect has monthly recurring charges and is not needed for this scenario.
✗
Use S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration incurs additional costs for faster transfers.
✓
Create a VPC Endpoint for S3 (Gateway type) and use it from the EC2 instances.
Why this is correct
VPC Endpoints allow private connectivity to S3 at no additional cost for data transfer.
Route traffic through a NAT Gateway in a public subnet.
Why it's wrong here
NATGateway charges apply for data processing and transfer.
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.
Trap categories for this question
Scenario analysis trap
Direct Connect has monthly recurring charges and is not needed for this scenario.
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 SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Networking and Content Delivery — This question tests Networking and Content Delivery — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a VPC Endpoint for S3 (Gateway type) and use it from the EC2 instances. — Option B is correct because using a VPC Endpoint for S3 allows traffic to stay within the AWS network, avoiding internet data transfer costs. Option A is incorrect because NAT Gateways incur charges for data processing and transfer. Option C is incorrect because S3 Transfer Acceleration is for faster uploads, not cost savings. Option D is incorrect because Direct Connect is a dedicated connection that incurs monthly fees and is overkill for this use case.
What should I do if I get this SOA-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 SOA-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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