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Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 259 discussion

Exam question from Amazon's AWS Certified Advanced Networking - Specialty ANS-C01
Question #: 259
Topic #: 1
[All AWS Certified Advanced Networking - Specialty ANS-C01 Questions]

A company has multiple VPCs with subnets that use IPv4. Traffic from the VPCs to the internet uses a NAT gateway. The company wants to transition to IPv6.

A network engineer creates multiple IPv6-only subnets in an existing testing VPC. The network engineer deploys a new Amazon EC2 instance that has an IPv6 address into one of the subnets. During testing, the network engineer discovers that the new EC2 instance is not able to communicate with an IPv4-only service through the internet. The network engineer needs to enable the IPv6 EC2 instance to communicate with the IPv4-only service.

Which solution will meet this requirement?

  • A. Enable DNS64 for the IPv6-only subnets. Update the route tables for the IPv6-only subnets to send traffic through the NAT gateway.
  • B. Enable NAT64 for the testing VPC. Reconfigure the existing NAT gateway to support IPv6.
  • C. Enable DNS64 for the new EC2 instance. Create a new egress-only internet gateway that supports IPv6.
  • D. Enable NAT64 for each route table. Create a new NAT gateway that supports both IPv4 and IPv6.
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Suggested Answer: A 🗳️
by c1193d4 at Jan. 7, 2025, 4:15 p.m.
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ashk123456
2 weeks, 4 days ago
Selected Answer: A
NAT64 is available by default on an AWS NAT Gateway when used with an IPv6-enabled subnet. However, DNS64 must be explicitly enabled at the subnet level for it to work properly.
upvoted 1 times
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c1193d4
3 months, 1 week ago
Selected Answer: A
A: DNS64 must be activated at the subnet level - NAT64 is available by default on a NAT GW
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