Network FundamentalsDifficulty 3/5
Which IPv6 address type is automatically configured on every IPv6-enabled interface and is required for neighbor discovery?
- ALink-local fe80::/10
- BMulticast ff02::1
- CGlobal unicast 2001::/16
- DUnique local fc00::/7
Show answer and rationale
Correct: A. Every IPv6 interface derives a link-local address in fe80::/10 (typically via EUI-64 or a random ID). Neighbor Discovery and routing protocol hellos use link-local addresses; they are never routed off the link.
- C — Global addresses are optional and assigned by SLAAC/DHCPv6/manual config.
- D — Unique local addresses are optional private addresses.
- B — ff02::1 is the all-nodes multicast group, not an interface address.