Which address is a valid IPv6 link-local unicast address?

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).

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