Cisco CCNA (200-301)Network FundamentalsMedium
Which IPv6 address is automatically configured on every IPv6-enabled interface and is used only for communication within the local link, never routed beyond it?
- AA global unicast address beginning with 2001::
- BA multicast address beginning with FF00::
- CA link-local address beginning with FE80::
- DA unique local address beginning with FC00::
Show answer & explanationAnswer & explanation
Correct answer: C. A link-local address beginning with FE80::
Link-local addresses (FE80::/10) are automatically assigned to every IPv6 interface and are used for communication with other devices on the same physical link, such as neighbor discovery and routing protocol adjacencies; they are never forwarded by routers.
Why the other options are wrong
- A. Global unicast addresses are routable across the internet, not link-restricted.
- B. Multicast addresses target groups of hosts, not a per-interface unicast identity.
- D. Unique local addresses are for private internal routing, not automatic link-only use.
IPv6 Link-Local Address
A link-local address (FE80::/10) is automatically assigned to every IPv6 interface for communication only within the local network segment.
- Never routed off the local link
- Used for protocols like OSPFv3 and NDP
- Automatically generated via EUI-64 or random interface ID
Memory trick: FE80 stays local, like a note stuck to your own fridge.