- A
Configure NAT64 and DNS64 on the VPC.
Why wrong: Incorrect. NAT64 and DNS64 are used for translating IPv6 traffic to IPv4 for resources that only have IPv4, but an internet-facing ALB supports IPv6 natively and does not require translation.
- B
Add a route in the subnet's route table for ::/0 to the Internet Gateway.
Correct. The route ::/0 to the internet gateway is required to allow IPv6 traffic to and from the internet for the subnet where the ALB resides.
- C
Associate an IPv6 CIDR block with the public subnet where the ALB is deployed.
Correct. The public subnet must have an IPv6 CIDR block associated so that the ALB can use IPv6 addresses from that subnet.
- D
Assign an IPv6 address to the ALB's network interface.
Why wrong: Incorrect. The ALB does not need an IPv6 address assigned to its network interface; it uses the subnet's IPv6 CIDR to serve IPv6 clients.
- E
Create an Egress-Only Internet Gateway for the VPC.
Why wrong: Incorrect. An Egress-Only Internet Gateway is for outbound-only IPv6 traffic from private subnets, not for an internet-facing ALB which requires inbound IPv6 traffic.
ANS-C01 IPv6 route to internet gateway Practice Question
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. A key principle to apply: iPv6 route to internet gateway. 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 internet-facing Application Load Balancer. The VPC is already associated with an IPv6 CIDR block. What additional configuration is required? (Choose two.)
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
Add a route in the subnet's route table for ::/0 to the Internet Gateway.
Options B and C are correct. To support IPv6 clients on an internet-facing ALB, the subnet where the ALB is deployed must have an IPv6 CIDR block associated (C), and the subnet's route table must include a route for ::/0 to the internet gateway (B). Option A is incorrect because NAT64/DNS64 is not needed; the ALB natively supports IPv6. Option D is incorrect because the ALB uses the subnet's IPv6 CIDR, not an assigned IPv6 address on its network interface. Option E is incorrect because an Egress-Only Internet Gateway is used for outbound-only IPv6 traffic from private subnets, not for internet-facing ALBs.
Key principle: IPv6 route to internet gateway
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure NAT64 and DNS64 on the VPC.
Why it's wrong here
Incorrect. NAT64 and DNS64 are used for translating IPv6 traffic to IPv4 for resources that only have IPv4, but an internet-facing ALB supports IPv6 natively and does not require translation.
- ✓
Add a route in the subnet's route table for ::/0 to the Internet Gateway.
- ✓
Associate an IPv6 CIDR block with the public subnet where the ALB is deployed.
- ✗
Assign an IPv6 address to the ALB's network interface.
Why it's wrong here
Incorrect. The ALB does not need an IPv6 address assigned to its network interface; it uses the subnet's IPv6 CIDR to serve IPv6 clients.
- ✗
Create an Egress-Only Internet Gateway for the VPC.
Why it's wrong here
Incorrect. An Egress-Only Internet Gateway is for outbound-only IPv6 traffic from private subnets, not for an internet-facing ALB which requires inbound IPv6 traffic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common trap is thinking that you need to assign an IPv6 address directly to the ALB's network interface, but the ALB inherits IPv6 support from the subnet's IPv6 CIDR.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- IPv6 route to internet gateway
- Subnet IPv6 CIDR association
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
IPv6 route to internet gateway
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
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Design — This question tests Network Design — IPv6 route to internet gateway.
What is the correct answer to this question?
The correct answer is: Add a route in the subnet's route table for ::/0 to the Internet Gateway. — Options B and C are correct. To support IPv6 clients on an internet-facing ALB, the subnet where the ALB is deployed must have an IPv6 CIDR block associated (C), and the subnet's route table must include a route for ::/0 to the internet gateway (B). Option A is incorrect because NAT64/DNS64 is not needed; the ALB natively supports IPv6. Option D is incorrect because the ALB uses the subnet's IPv6 CIDR, not an assigned IPv6 address on its network interface. Option E is incorrect because an Egress-Only Internet Gateway is used for outbound-only IPv6 traffic from private subnets, not for internet-facing ALBs.
What should I do if I get this ANS-C01 question wrong?
Review iPv6 route to internet gateway, then practise related ANS-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
IPv6 route to internet gateway
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Last reviewed: Jun 20, 2026
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