Which of the following describes the dual-stack approach?

Which of the following describes the dual-stack approach?

• A. It allows IPv4 and IPv6 to coexist in the same network.
• B. It translates IPv6 to IPv4 using NAT64.
• C. It encapsulates IPv6 inside IPv4.
• D. It uses IPv6 exclusively.

Answer: (A)

Dual-stack means devices run both IPv4 and IPv6 stacks at the same time, allowing them to handle traffic for either protocol. This enables IPv4 and IPv6 to coexist in the same network, so hosts can communicate with both IPv4-only and IPv6-enabled destinations without requiring all devices to switch to IPv6 immediately. It’s a gradual migration approach that preserves compatibility with the existing IPv4 infrastructure while IPv6 is deployed. The other options describe different methods: translating between IPv6 and IPv4 (translation) and carrying IPv6 inside IPv4 tunnels (tunneling). Using IPv6 exclusively means IPv4 isn’t used at all, which is not dual-stack.

Dual-stack means devices run both IPv4 and IPv6 stacks at the same time, allowing them to handle traffic for either protocol. This enables IPv4 and IPv6 to coexist in the same network, so hosts can communicate with both IPv4-only and IPv6-enabled destinations without requiring all devices to switch to IPv6 immediately. It’s a gradual migration approach that preserves compatibility with the existing IPv4 infrastructure while IPv6 is deployed.

The other options describe different methods: translating between IPv6 and IPv4 (translation) and carrying IPv6 inside IPv4 tunnels (tunneling). Using IPv6 exclusively means IPv4 isn’t used at all, which is not dual-stack.