- A
Assign an Amazon-provided IPv6 CIDR block to the VPC and subnets, and create an Egress-Only Internet Gateway for outbound traffic.
Correct: Standard IPv6 enablement.
- B
Create a VPN connection to an external IPv6 network.
Why wrong: Wrong: Does not enable IPv6 internet access.
- C
Configure a NAT Gateway in a public subnet and assign IPv6 addresses to instances.
Why wrong: Wrong: NAT Gateway does not support IPv6.
- D
Use an Internet Gateway with NAT for IPv6 traffic.
Why wrong: Wrong: Internet Gateway supports IPv6 but NAT is not needed.
Question 149 of 1,705
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. 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 IPv4 CIDR of 10.0.0.0/16. They need to add IPv6 support for their application. What is the simplest way to enable IPv6 communication for instances in the VPC?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assign an Amazon-provided IPv6 CIDR block to the VPC and subnets, and create an Egress-Only Internet Gateway for outbound traffic.
Option A is correct because the simplest way to enable IPv6 communication in a VPC is to associate an Amazon-provided IPv6 CIDR block (a /56 from the 2002::/25 range) to the VPC and its subnets, then create an Egress-Only Internet Gateway (EIGW) for outbound-only IPv6 traffic. This allows instances with IPv6 addresses to initiate outbound connections to the internet while preventing inbound connections, which is the default security model for IPv6 in AWS.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Assign an Amazon-provided IPv6 CIDR block to the VPC and subnets, and create an Egress-Only Internet Gateway for outbound traffic.
Why this is correct
Correct: Standard IPv6 enablement.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a VPN connection to an external IPv6 network.
Why it's wrong here
Wrong: Does not enable IPv6 internet access.
- ✗
Configure a NAT Gateway in a public subnet and assign IPv6 addresses to instances.
- ✗
Use an Internet Gateway with NAT for IPv6 traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Internet Gateway (which supports both IPv4 and IPv6) with the need for a NAT-like device for IPv6, not realizing that IPv6 does not use NAT and that an Egress-Only Internet Gateway is the correct AWS service for outbound-only IPv6 access.
Detailed technical explanation
How to think about this question
When you associate an Amazon-provided IPv6 CIDR block to a VPC, AWS automatically assigns a /56 block from the global unicast address range (2002::/25). Subnets receive a /64 block, and instances can be assigned IPv6 addresses via the subnet's IPv6 CIDR. The Egress-Only Internet Gateway is a horizontally scaled, redundant gateway that allows outbound IPv6 traffic to the internet but drops any unsolicited inbound traffic, mirroring the behavior of a NAT Gateway for IPv4 but without address translation.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Assign an Amazon-provided IPv6 CIDR block to the VPC and subnets, and create an Egress-Only Internet Gateway for outbound traffic. — Option A is correct because the simplest way to enable IPv6 communication in a VPC is to associate an Amazon-provided IPv6 CIDR block (a /56 from the 2002::/25 range) to the VPC and its subnets, then create an Egress-Only Internet Gateway (EIGW) for outbound-only IPv6 traffic. This allows instances with IPv6 addresses to initiate outbound connections to the internet while preventing inbound connections, which is the default security model for IPv6 in AWS.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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