Dual Stack allows devices to support both IPv4 and IPv6 routing simultaneously.

Dual Stack allows devices to support both IPv4 and IPv6 routing simultaneously.

• A. NAT64
• B. Tunneling
• C. Dual Stack
• D. IPv6 Only

Answer: (C)

Dual Stack means a device has both IPv4 and IPv6 protocol stacks active at the same time, with addresses for both and the ability to run routing for each protocol. This lets the device forward and receive traffic using either IP version, so it can communicate with IPv4 targets and IPv6 targets without needing a separate translator or a single-path tunnel. In practice, a dual-stacked device can participate in networks that still run IPv4 and in networks that use IPv6, and it can choose the appropriate protocol based on the destination. This simultaneous support is what enables seamless coexistence during the transition from IPv4 to IPv6, without forcing translation or encapsulation. NAT64, by contrast, is a translation mechanism that allows IPv6-only networks to reach IPv4 resources by converting between IPv6 and IPv4 addresses. It doesn’t describe a device that runs both IP stacks natively. Tunneling is a technique to carry one protocol inside another, such as encapsulating IPv6 inside IPv4 to traverse an IPv4 network. It’s about how packets are transported, not about a device that inherently handles both protocols for normal routing. IPv6 Only means the device supports only IPv6, with no native IPv4 capability, which is the opposite of dual-stack.

Dual Stack means a device has both IPv4 and IPv6 protocol stacks active at the same time, with addresses for both and the ability to run routing for each protocol. This lets the device forward and receive traffic using either IP version, so it can communicate with IPv4 targets and IPv6 targets without needing a separate translator or a single-path tunnel. In practice, a dual-stacked device can participate in networks that still run IPv4 and in networks that use IPv6, and it can choose the appropriate protocol based on the destination. This simultaneous support is what enables seamless coexistence during the transition from IPv4 to IPv6, without forcing translation or encapsulation.

NAT64, by contrast, is a translation mechanism that allows IPv6-only networks to reach IPv4 resources by converting between IPv6 and IPv4 addresses. It doesn’t describe a device that runs both IP stacks natively.

Tunneling is a technique to carry one protocol inside another, such as encapsulating IPv6 inside IPv4 to traverse an IPv4 network. It’s about how packets are transported, not about a device that inherently handles both protocols for normal routing.

IPv6 Only means the device supports only IPv6, with no native IPv4 capability, which is the opposite of dual-stack.