- A
Assign a custom IPv6 CIDR block from your own range to the VPC and add a route to the Internet Gateway.
Why wrong: Custom IPv6 CIDR requires requesting from AWS.
- B
Associate an Amazon-provided IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and allocate IPv6 addresses to the subnets.
Standard procedure for public IPv6 access.
- C
Associate an IPv6 CIDR block, create an Egress-Only Internet Gateway, and route ::/0 to it.
Why wrong: Egress-only does not allow inbound.
- D
Associate a /64 IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and assign IPv6 addresses to instances.
Why wrong: VPC IPv6 CIDR must be /56.
Question 411 of 1,705
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 company has a VPC with an IPv4 CIDR of 10.0.0.0/16 and needs to add IPv6 support for its public-facing web application. The application must be accessible via both IPv4 and IPv6. The VPC already has an Internet Gateway attached. What is the correct set of steps 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 Amazon-provided IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and allocate IPv6 addresses to the subnets.
Option B is correct because to enable IPv6 in a VPC, you must associate an Amazon-provided IPv6 CIDR block (a /56 block by default), add a route for the IPv6 default route (::/0) to the Internet Gateway, and allocate IPv6 addresses to the subnets. The Internet Gateway already supports IPv6 traffic natively, so no additional gateway is required for public-facing IPv6 access.
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 a custom IPv6 CIDR block from your own range to the VPC and add a route to the Internet Gateway.
Why it's wrong here
Custom IPv6 CIDR requires requesting from AWS.
- ✓
Associate an Amazon-provided IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and allocate IPv6 addresses to the subnets.
Why this is correct
Standard procedure for public IPv6 access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Associate an IPv6 CIDR block, create an Egress-Only Internet Gateway, and route ::/0 to it.
Why it's wrong here
Egress-only does not allow inbound.
- ✗
Associate a /64 IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and assign IPv6 addresses to instances.
Why it's wrong here
VPC IPv6 CIDR must be /56.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the need for an Egress-Only Internet Gateway with public-facing IPv6 access, but for inbound traffic, the regular Internet Gateway works for both IPv4 and IPv6.
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 space (2002::/16 range for AWS). Each subnet then receives a /64 IPv6 CIDR, and instances can be assigned IPv6 addresses via the subnet. The Internet Gateway handles both IPv4 and IPv6 traffic transparently, so no separate gateway is needed for public IPv6 access. This dual-stack architecture allows the application to be reachable via both protocols without additional complexity.
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 Implementation — This question tests Network Implementation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Associate an Amazon-provided IPv6 CIDR block to the VPC, add a route for ::/0 to the Internet Gateway, and allocate IPv6 addresses to the subnets. — Option B is correct because to enable IPv6 in a VPC, you must associate an Amazon-provided IPv6 CIDR block (a /56 block by default), add a route for the IPv6 default route (::/0) to the Internet Gateway, and allocate IPv6 addresses to the subnets. The Internet Gateway already supports IPv6 traffic natively, so no additional gateway is required for public-facing IPv6 access.
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
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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