What term describes the technique of encapsulating IPv6 packets inside GRE IPv4 packets to traverse an IPv4 network?

What term describes the technique of encapsulating IPv6 packets inside GRE IPv4 packets to traverse an IPv4 network?

• A. Generic Routing Encapsulation (GRE) Tunnel
• B. Wireless Controller
• C. Mesh Network
• D. Firewalls

Answer: (A)

Encapsulation tunneling is the idea of wrapping a packet in another protocol so it can travel over a network that uses a different protocol. In this scenario, IPv6 datagrams are wrapped inside a GRE header, and then again inside an IPv4 header, forming a GRE tunnel. Routers along the IPv4 path see only IPv4, while the original IPv6 payload is preserved inside the GRE envelope, allowing it to reach its destination. GRE is specifically designed to transport a variety of network-layer protocols over an IP network by creating these tunnels, which is why this technique is called a GRE tunnel. The other items describe devices or network architectures that don’t provide this tunneling capability, so they don’t describe the method used here.

Encapsulation tunneling is the idea of wrapping a packet in another protocol so it can travel over a network that uses a different protocol. In this scenario, IPv6 datagrams are wrapped inside a GRE header, and then again inside an IPv4 header, forming a GRE tunnel. Routers along the IPv4 path see only IPv4, while the original IPv6 payload is preserved inside the GRE envelope, allowing it to reach its destination. GRE is specifically designed to transport a variety of network-layer protocols over an IP network by creating these tunnels, which is why this technique is called a GRE tunnel. The other items describe devices or network architectures that don’t provide this tunneling capability, so they don’t describe the method used here.