The answer is a VPC Gateway Endpoint for S3. This is correct because a Gateway Endpoint provides private connectivity to S3 from within a VPC by routing traffic through AWS’s internal network, completely bypassing the public internet and eliminating the need for an internet gateway or NAT device. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how to design private, secure access patterns for AWS services, often appearing in scenario-based questions where a developer needs to keep traffic off the internet. A common trap is confusing Gateway Endpoints with Interface Endpoints—remember that S3 and DynamoDB exclusively use Gateway Endpoints, not Interface Endpoints, which are for services like API Gateway or Kinesis. Another pitfall is assuming a NAT gateway provides private access, but NAT only enables outbound internet traffic, not private connectivity to S3. For a quick memory tip, think “S3 Gateway: no gateway, no NAT—just a route table entry.”
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 developer wants to allow an EC2 instance in a VPC to access an Amazon S3 bucket without traversing the public 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
✓
VPC Gateway Endpoint for S3.
Option D is correct because a VPC Gateway Endpoint allows private access to S3 without requiring an internet gateway or NAT device. Option A is incorrect because S3 does not use an interface endpoint directly (it uses gateway endpoint). Option B is incorrect because NAT gateway provides internet access but not private access to S3. Option C is incorrect because S3 does not support Direct Connect privately without a VPC endpoint.
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.
✗
AWS PrivateLink with an interface VPC endpoint.
Why it's wrong here
S3 uses gateway endpoints, not interface endpoints, though PrivateLink can be used for other services.
✓
VPC Gateway Endpoint for S3.
Why this is correct
Gateway endpoints provide private access to S3 and DynamoDB.
NATgateway routes traffic through the internet, but the traffic to S3 would still go over the internet.
✗
AWS Direct Connect with a public VIF.
Why it's wrong here
Public VIF still routes traffic through the 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: VPC Gateway Endpoint for S3. — Option D is correct because a VPC Gateway Endpoint allows private access to S3 without requiring an internet gateway or NAT device. Option A is incorrect because S3 does not use an interface endpoint directly (it uses gateway endpoint). Option B is incorrect because NAT gateway provides internet access but not private access to S3. Option C is incorrect because S3 does not support Direct Connect privately without a VPC endpoint.
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.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer needs to allow an EC2 instance in a private subnet to access an S3 bucket without traversing the internet. Which AWS service should be used?
easy
A.VPC Peering
✓ B.VPC Gateway Endpoint
C.Internet Gateway
D.NAT Gateway
Why B: A VPC Gateway Endpoint provides private connectivity to S3 and DynamoDB without requiring a NAT or IGW.
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This ANS-C01 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 ANS-C01 exam.
Question Discussion
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