Which address is a valid IPv6 link-local unicast address?
- FEC8:1::FFFF
- FD80::1:1234
- FE80::1:4545:6578:ABC1
- FE0A::100:7788:998F
- FC90:5678:4251:FFFF
Answers Explanation & Hints: IPv6 LLAs are in the fe80::/10 range. The /10 indicates that the first 10 bits are 1111 1110 10xx xxxx. The first hextet has a range of 1111 1110 1000 0000 (fe80) to 1111 1110 1011 1111 (febf).