In IPv6, which multicast address is used for all nodes on a local link?

The multicast address used for all nodes on a local link in IPv6 is ff02::1. This address is part of the link-local multicast addresses specified in IPv6. The "ff02::" prefix indicates that this is a multicast address that is limited to the link scope, meaning it is only relevant and reachable on the local network segment.

When a packet is sent to the ff02::1 address, all IPv6-capable nodes on the local link will receive and process the packet. This is essential for various functions, such as Neighbor Discovery Protocol (NDP), which is key for functionalities like address resolution and router discovery, enabling seamless network operations among nodes in an IPv6 environment.

In contrast, the other options represent different types of multicast addresses not used specifically for all nodes on a local link:

• ff05::1 is intended for site-local multicast, which encompasses a broader scope.

• ff00::1 is not a valid multicast address in the context of IPv6 addressing, as it is simply a representation of the multicast range, not specifically a designated address.

• ff02::2 is meant specifically for all routers on a local link and would not include all nodes.

Thus, ff02::1