- A
Use an egress-only internet gateway for IPv6 traffic.
Why wrong: Egress-only internet gateway is for outbound-only traffic; inbound traffic is not possible.
- B
Associate an IPv6 CIDR block with the VPC and subnets, and update route tables to route IPv6 traffic to an internet gateway.
Simplest way to enable IPv6.
- C
Deploy a NAT64 device to translate IPv6 to IPv4.
Why wrong: NAT64 is for translation, not native IPv6.
- D
Set up a VPN connection to an ISP that provides IPv6.
Why wrong: VPN is not for internet-facing traffic.
Question 451 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 is deploying an application that must use IPv6 for internet-facing traffic. The VPC is currently using IPv4 only. What is the simplest way to enable IPv6?
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
✓
Associate an IPv6 CIDR block with the VPC and subnets, and update route tables to route IPv6 traffic to an internet gateway.
Option B is correct because the simplest way to enable IPv6 in an existing IPv4-only VPC is to associate an IPv6 CIDR block (e.g., an Amazon-provided /56) with the VPC and subnets, then update the route tables to direct IPv6 traffic (::/0) to an internet gateway. This requires no additional translation or complex infrastructure, as the internet gateway is already dual-stack capable and can handle both IPv4 and IPv6 traffic natively.
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.
- ✗
Use an egress-only internet gateway for IPv6 traffic.
Why it's wrong here
Egress-only internet gateway is for outbound-only traffic; inbound traffic is not possible.
- ✓
Associate an IPv6 CIDR block with the VPC and subnets, and update route tables to route IPv6 traffic to an internet gateway.
Why this is correct
Simplest way to enable IPv6.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy a NAT64 device to translate IPv6 to IPv4.
Why it's wrong here
NAT64 is for translation, not native IPv6.
- ✗
Set up a VPN connection to an ISP that provides IPv6.
Why it's wrong here
VPN is not for internet-facing traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the egress-only internet gateway (which is only for outbound IPv6 from private subnets) with the standard internet gateway, or mistakenly think a translation mechanism like NAT64 is required, when in fact the simplest solution is to add an IPv6 CIDR and route to the existing internet gateway.
Detailed technical explanation
How to think about this question
When you associate an IPv6 CIDR block with a VPC, the VPC becomes dual-stack, and each subnet can have an associated IPv6 CIDR (e.g., /64). The internet gateway in AWS is inherently dual-stack, so no separate gateway is needed for IPv6; you simply add a route for ::/0 pointing to the internet gateway. A common subtlety is that IPv6 addresses in AWS are automatically assigned from the subnet's range and are globally unique, so no NAT or translation is required for outbound traffic, but security groups and network ACLs must be updated to allow IPv6 traffic.
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: Associate an IPv6 CIDR block with the VPC and subnets, and update route tables to route IPv6 traffic to an internet gateway. — Option B is correct because the simplest way to enable IPv6 in an existing IPv4-only VPC is to associate an IPv6 CIDR block (e.g., an Amazon-provided /56) with the VPC and subnets, then update the route tables to direct IPv6 traffic (::/0) to an internet gateway. This requires no additional translation or complex infrastructure, as the internet gateway is already dual-stack capable and can handle both IPv4 and IPv6 traffic natively.
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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