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AWS Certified Solutions Architect study material · question 360 of 500

What must a VPC carry before a dual-stack subnet can be created in it?

  1. Both an IPv4 and an IPv6 CIDR block
  2. An egress-only internet gateway
  3. A NAT gateway with an Elastic IP
  4. A transit gateway attachment
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Answer: A. Both an IPv4 and an IPv6 CIDR block

A dual-stack subnet has both an IPv4 and an IPv6 CIDR block, which requires the surrounding VPC to have both as well.

Source: Subnets for your VPC (Amazon Web Services) — Subnet IP address range

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