This ANS-C01 practice question tests your understanding of network design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 is designing a VPC with both IPv4 and IPv6 CIDR blocks. The VPC must support internet-facing applications accessible via IPv6. Which resource must be configured as IPv6-enabled to allow internet traffic?
Internet Gateway
Internet Gateway supports both IPv4 and IPv6 traffic.
VPC Peering connection
Why wrong: VPC Peering is for private connectivity, not internet access.
NAT Gateway
Why wrong: NAT Gateway only supports IPv4 outbound traffic.
Transit Gateway
Why wrong: Transit Gateway is for internal routing, not internet 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
Internet Gateway
An Internet Gateway (IGW) is the only resource that supports both IPv4 and IPv6 traffic and provides a target in the VPC route table for IPv6 default routes (::/0) to enable direct internet access for IPv6-enabled resources. Unlike IPv4, which often requires NAT for private addressing, IPv6 globally unique addresses allow direct communication through the IGW without translation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Internet Gateway
Why this is correct
Internet Gateway supports both IPv4 and IPv6 traffic.
Related concept
Read the scenario before looking for a memorised answer.
VPC Peering connection
Why it's wrong here
VPC Peering is for private connectivity, not internet access.
NAT Gateway
Transit Gateway
Why it's wrong here
Transit Gateway is for internal routing, not internet access.
Common exam traps
AWS often tests the misconception that a NAT Gateway can handle IPv6 traffic, but NAT is not used for IPv6 due to the abundance of globally unique addresses; the correct resource for IPv6 internet access is always the Internet Gateway.
Detailed technical explanation
Under the hood, an Internet Gateway performs 1:1 NAT for IPv4 (mapping private IPs to its public IPs) but for IPv6 it simply forwards packets without address translation because IPv6 addresses are globally unique. In a dual-stack VPC, the IGW must have both IPv4 and IPv6 routes (0.0.0.0/0 and ::/0) in the route table, and the subnet must be public (auto-assign public IPv4 and IPv6 addresses). A real-world scenario is hosting a web server on an EC2 instance with an IPv6 address; the IGW allows clients with IPv6 connectivity to reach it directly, while IPv4 clients still use the IGW’s public IPv4 mapping.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
The correct answer is: Internet Gateway — An Internet Gateway (IGW) is the only resource that supports both IPv4 and IPv6 traffic and provides a target in the VPC route table for IPv6 default routes (::/0) to enable direct internet access for IPv6-enabled resources. Unlike IPv4, which often requires NAT for private addressing, IPv6 globally unique addresses allow direct communication through the IGW without translation.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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