IPv6 Multicast Groups for Interface Configuration | Cisco Exam 200-301

Joining IPv6 Multicast Groups on an Interface


When configuring IPv6 on an interface, which two IPv6 multicast groups are joined? (Choose two.)



Click on the arrows to vote for the correct answer

A. B. C. D. E.


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.