Quick Answer
The answer is the egress-only internet gateway. This is the correct choice because an egress-only internet gateway is a horizontally scaled, highly available AWS component that enables outbound IPv6 traffic from instances in a private subnet to the internet, while explicitly preventing any unsolicited inbound IPv6 connections. Unlike a standard NAT gateway, which works only for IPv4, the egress-only internet gateway is purpose-built for IPv6, allowing private subnet instances to initiate outbound communication—such as fetching updates or sending data—without exposing them to incoming traffic. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of IPv6 routing and security boundaries; a common trap is confusing the egress-only internet gateway with a NAT gateway or an internet gateway, but remember that NAT gateways do not support IPv6, and an internet gateway would allow bidirectional traffic. For a quick memory tip: think of it as a “one-way door” for IPv6—outbound only, no inbound allowed.
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 an IPv6 CIDR and wants to provide internet access to instances in a private subnet using IPv6. Which AWS service should be used?
VPC Gateway Endpoint
Why wrong: Gateway endpoints support S3 and DynamoDB only, not general internet access.
Internet Gateway
Why wrong: Internet Gateway allows inbound traffic; not suitable for private subnets.
NAT Gateway
Why wrong: NAT Gateway does not support IPv6.
Egress-Only Internet Gateway
Egress-only internet gateway provides outbound-only IPv6 access.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Egress-Only Internet Gateway
An egress-only internet gateway allows outbound IPv6 traffic from private subnets but blocks inbound traffic.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
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
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.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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.
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FAQ
Network Implementation — This question tests Network Implementation — CIDR notation defines the prefix length..
The correct answer is: Egress-Only Internet Gateway — An egress-only internet gateway allows outbound IPv6 traffic from private subnets but blocks inbound traffic.
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.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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.
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