Questions

Which of these represents an IPv6 link-local address?

Which of these represents an IPv6 link-local address?

A.
FE08::280e:611:a:f14f:3d69

B.
FE81::280f:512b:e14f:3d69

C.
FE80::380e:611a:e14f:3d69

D.
FEFE:0345:5f1b::e14d:3d69

Discussion

5 Responses to “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

  2. savaspar says:

    Correct answers B & C. I’m starting loose my trust to this site..

  3. jilla says:

    How abt answer B?
    im confused i think B&C should b correct, am i correct?
    pls xplain me

  4. alchemist says:

    link local starts with f380..ans i c)

  5. alchemist says:

    link local starts with FE80..ans i c)

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