The answer is to create a VPC Gateway Endpoint for S3. This is correct because a Gateway Endpoint provides private, direct connectivity to S3 from a private subnet without requiring an internet gateway, NAT gateway, or any public IP address, routing traffic entirely within the AWS network. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this question tests your understanding of VPC endpoints and the critical distinction between Gateway Endpoints (used for S3 and DynamoDB) and Interface Endpoints (used for most other AWS services). A common trap is confusing NAT gateways or Direct Connect as solutions, but NAT gateways still route traffic through the internet, and Direct Connect is for on-premises connectivity, not private subnet-to-S3 access. Remember the memory tip: "S3 and DynamoDB are the only two services that use Gateway Endpoints—think of them as the 'gateway' to storage without the internet."
ANS-C01 Network Implementation Practice Question
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 wants to allow an EC2 instance in a private subnet to download files from an S3 bucket without traversing the internet. Which AWS service should be used?
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.
Option D is correct because a VPC Gateway Endpoint for S3 allows private connectivity to S3 without internet. Option A is wrong because NAT gateway uses internet. Option B is wrong because Direct Connect is for on-premises. Option C is wrong because S3 does not support VPC Interface Endpoint by default; Gateway Endpoint is used for S3.
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.
✗
Establish an AWS Direct Connect connection to the VPC.
Why it's wrong here
Overkill and expensive for S3 access; also requires on-premises.
✗
Attach an internet gateway and route through a NAT gateway.
Why it's wrong here
Uses internet, not private.
✗
Create a VPC Interface Endpoint for S3.
Why it's wrong here
Interface Endpoint is not supported for S3; only Gateway Endpoint.
✓
Create a VPC Gateway Endpoint for S3.
Why this is correct
Gateway Endpoint provides private connectivity to S3 without internet.
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. — Option D is correct because a VPC Gateway Endpoint for S3 allows private connectivity to S3 without internet. Option A is wrong because NAT gateway uses internet. Option B is wrong because Direct Connect is for on-premises. Option C is wrong because S3 does not support VPC Interface Endpoint by default; Gateway Endpoint is used for S3.
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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