- Anycast is a new type of address in IPv6 that allows an address to be assigned to multiple interfaces but packets are only routed to the nearest interface, unlike multicast which routes to all interfaces. It can be used to identify sets of routers. - Multicast allows delivery of packets to many destinations like interactive conferencing and dissemination of content. In IPv4 it uses class D addresses and in IPv6 it uses addresses with prefix FF. - IPv6 nodes are assigned multicast addresses that correspond to solicited node addresses used for neighbor discovery and all nodes/routers addresses for different address scopes.