ff02:0:0:0:0:0:0:1. The IPv6 link-local all-nodes multicast address is FF02::1, fully written as ff02:0:0:0:0:0:0:1. The FF02 scope identifies link-local multicast, and the group ID of 1 identifies all nodes on the local link. FE80::/10 addresses are link-local unicast addresses, not multicast groups. Global-looking addresses and malformed prefixes do not match the all-nodes multicast function. Cisco CCNA 200-301 v1.1 Network Fundamentals expects engineers to know important IPv6 multicast groups such as FF02::1 for all nodes and FF02::2 for all routers. The corrected answer is ff02:0:0:0:0:0:0:1. This address is used by IPv6 neighbor discovery and other local-link operations to reach all IPv6 nodes on the segment.
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