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AWS Certified Solutions Architect study material · question 388 of 500

What does an IPv4-only subnet mean for the resources inside it?

  1. They must communicate over IPv4, since there is no IPv6 CIDR block
  2. They receive both IPv4 and IPv6 addresses
  3. They can reach IPv6 services through an egress-only gateway
  4. They cannot use a NAT gateway
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Answer: A. They must communicate over IPv4, since there is no IPv6 CIDR block

An IPv4-only subnet carries an IPv4 CIDR block and no IPv6 block, so everything inside it uses IPv4.

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

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