For which protocol is the multicast address FF02::A used?

The multicast address FF02::A is specifically used by the Enhanced Interior Gateway Routing Protocol (EIGRP). This address is part of the IPv6 multicast addresses and is designated for EIGRP routing updates and communication among EIGRP routers. When EIGRP routers need to send routing information, they use this multicast address to ensure that the packets reach all routers that are part of the same EIGRP autonomous system.

In the context of routing protocols, it is important to use the appropriate multicast addresses for efficient communication and to minimize unnecessary traffic on the network. The choice of FF02::A as a multicast address ensures that only routers running EIGRP will process the packets sent to this address, thus optimizing the network's performance and scalability.

Other protocols mentioned, such as RIP and OSPF, have their own specific multicast addresses for their routing updates, while ARP (Address Resolution Protocol) operates differently and does not utilize multicast addresses in the same way as routing protocols do. This specificity of the multicast address ensures that EIGRP can function properly within the IPv6 networking environment.