Which IPv6 prefix denotes a link-local address?

Which IPv6 prefix denotes a link-local address?

• A. ::1/128
• B. fe80::/10
• C. 2000::/3
• D. ff00::/8

Answer: (B)

Link-local addresses are valid only on the local link and aren’t routed beyond that single network segment. The prefix that designates this scope is fe80::/10, which covers addresses from fe80 to febf. Interfaces automatically generate a link-local address for local communication and neighbor discovery. Other prefixes correspond to different scopes or purposes—::1/128 is the loopback address for a single host, 2000::/3 is global unicast space for internet-facing addresses, and ff00::/8 is used for multicast. So fe80::/10 is the link-local prefix.

Link-local addresses are valid only on the local link and aren’t routed beyond that single network segment. The prefix that designates this scope is fe80::/10, which covers addresses from fe80 to febf. Interfaces automatically generate a link-local address for local communication and neighbor discovery. Other prefixes correspond to different scopes or purposes—::1/128 is the loopback address for a single host, 2000::/3 is global unicast space for internet-facing addresses, and ff00::/8 is used for multicast. So fe80::/10 is the link-local prefix.