This ANS-C01 practice question tests your understanding of network implementation. 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 has a VPC with a public subnet and a private subnet. An EC2 instance in the private subnet needs to access an S3 bucket. The company wants to ensure that traffic to S3 does not traverse the internet. Which solution should a network engineer implement?
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 gateway endpoint for S3 and add a route to the S3 prefix list via the endpoint.
Option B is correct. A VPC gateway endpoint for S3 allows private connectivity to S3 without internet. Option A is wrong because a NAT gateway still traverses the internet. Option C is wrong because a VPC interface endpoint for S3 is not supported (S3 uses gateway endpoints). Option D is wrong because an S3 VPN endpoint is not an AWS service.
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 interface endpoint for S3 and attach it to the private subnet.
Why it's wrong here
S3 does not support interface endpoints; only gateway endpoints.
✗
Deploy an S3 VPN endpoint in the VPC.
Why it's wrong here
No such service; VPN endpoints are for other services.
✓
Create a VPC gateway endpoint for S3 and add a route to the S3 prefix list via the endpoint.
Why this is correct
Gateway endpoints provide private connectivity to S3.
Set up a NAT gateway in the public subnet and add a route to the S3 prefix list via the NAT gateway.
Why it's wrong here
Traffic would go through the NATgateway and internet, not private.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 ANS-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Create a VPC gateway endpoint for S3 and add a route to the S3 prefix list via the endpoint. — Option B is correct. A VPC gateway endpoint for S3 allows private connectivity to S3 without internet. Option A is wrong because a NAT gateway still traverses the internet. Option C is wrong because a VPC interface endpoint for S3 is not supported (S3 uses gateway endpoints). Option D is wrong because an S3 VPN endpoint is not an AWS service.
What should I do if I get this ANS-C01 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 ANS-C01 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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