Which of these represents an IPv6 link-local address?
A.
FE80::380e:611a:e14f:3d69
B.
FE81::280f:512b:e14f:3d69
C.
FEFE:0345:5f1b::e14d:3d69
D.
FE08::280e:611:a:f14f:3d69
Explanation:
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link-local addresses always start at fe80::/10 (forget FE81)
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.
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In the Internet Protocol Version 6 (IPv6), the address block fe80::/10 has been reserved for link-local unicast addressing. The actual link local addresses are assigned with the prefix fe80::/64.
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