Joining IPv6 Multicast Groups on an Interface

DE

When an interface is configured with IPv6 address, it automatically joins the all nodes (FF02::1) and solicited-node (FF02::1:FFxx:xxxx) multicast groups. The all- node group is used to communicate with all interfaces on the local link, and the solicited-nodes multicast group is required for link-layer address resolution.

Routers also join a third multicast group, the all-routers group (FF02::2).

When an IPv6 address is assigned to an interface, it automatically becomes a member of two IPv6 multicast groups:

1. Solicited-Node multicast group: The Solicited-Node multicast group is used for neighbor discovery. It is a group-specific query used to resolve the Layer 2 address of a destination IPv6 address. The Solicited-Node multicast group address is created by taking the prefix FF02::1:FF00:0/104 and appending the last 24 bits of the IPv6 address as the group ID. For example, the Solicited-Node multicast group address for the IPv6 address 2001:DB8::1 would be FF02::1:FF00:1.

2. All-nodes multicast group: The All-nodes multicast group is used to send packets to all nodes on a link. It is used for things like Router Advertisements (RAs) and Duplicate Address Detection (DAD). The All-nodes multicast group address is FF02::1.

Therefore, the correct answers are:

D. FF02::1 - The All-nodes multicast group. E. FF02::2 - The Solicited-Node multicast group.

Answer A (2000::/3) is incorrect. It is not a multicast group address, but rather a range of global unicast addresses.

Answer B (2002::5) is incorrect. It is not a multicast group address, but rather a specific global unicast address.

Answer C (FC00::/7) is incorrect. It is not a multicast group address, but rather a range of unique local unicast addresses.