What version of RIP is specifically designed for IPv6?

RIPng, or Routing Information Protocol next generation, is the version of the Routing Information Protocol specifically designed to support IPv6. This protocol builds on the concepts of its predecessors while accommodating the requirements and address structure associated with IPv6. One of the key features of RIPng is that it uses the IPv6 addressing scheme and mechanisms compatible with IPv6, allowing for the routing of packets across an IPv6 infrastructure.

RIPng operates by sending routing updates, which include information about reachable networks, through multicast addresses applicable for IPv6, ensuring efficient communication in a network utilizing this address format. The adaptation for IPv6 necessitated the versioning, creating RIPng as a distinct protocol variant.

In contrast, RIPv1 and RIPv2 are designed for IPv4 networks. RIPv1 does not support classless routing or VLSM, while RIPv2 introduced some enhancements, including support for classless routing and authentication. RIPx is not a widely recognized standard within the context of routing protocols for either IP version and is associated with proprietary Cisco implementations. These factors reinforce why RIPng is the definitive choice for devices operating in an IPv6 environment.