The IPv6 packet is transported inside an IPv4 packet. This describes which co-existence method?

The IPv6 packet is transported inside an IPv4 packet. This describes which co-existence method?

• A. Dual-stack
• B. Tunneling
• C. Translation
• D. NAT64

Answer: (B)

Encapsulation via tunneling. When a packet of one protocol is carried inside the payload of another protocol to traverse a network that doesn’t support the inner protocol, that’s tunneling. Here, the IPv6 packet is wrapped inside an IPv4 packet so it can move across an IPv4 path; the outer IPv4 header gets the packet to the IPv4 network, and the inner IPv6 header is restored at the destination. Dual-stack means devices run both IPv4 and IPv6 simultaneously without encapsulation. Translation would convert between IPv6 and IPv4 headers rather than wrap the IPv6 packet inside IPv4. So transporting an IPv6 packet inside an IPv4 packet specifically denotes tunneling.

Encapsulation via tunneling. When a packet of one protocol is carried inside the payload of another protocol to traverse a network that doesn’t support the inner protocol, that’s tunneling. Here, the IPv6 packet is wrapped inside an IPv4 packet so it can move across an IPv4 path; the outer IPv4 header gets the packet to the IPv4 network, and the inner IPv6 header is restored at the destination. Dual-stack means devices run both IPv4 and IPv6 simultaneously without encapsulation. Translation would convert between IPv6 and IPv4 headers rather than wrap the IPv6 packet inside IPv4. So transporting an IPv6 packet inside an IPv4 packet specifically denotes tunneling.