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5 Comments on “Which of these represents an IPv6 link-local address?

  1. link-local addresses always start at fe80::/10
    each hex number takes 4 bits to represent
    fe80 is
    1111 – F
    1110 – E
    1000 – 8
    0000 – 0

    FE80 = 1111 1110 1000 0000
    the mask is /10 so the first 10 bits are invariable
    9th bit is always 1, 10th bit is always 0, that makes the maximum value for the first group of hex numbers in binary: 1111 1110 1011 1111, or FEBF in hex

    the entire range would be… FE80:: to FEBF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
    that’s a HUGE space. nothing new tho as this is ipv6 we’re talking about.
    this means option B could be valid too. and it is

    some reference:
    http://en.wikipedia.org/wiki/Reserved_IP_addresses
    http://en.wikipedia.org/wiki/Link-local_address




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