If your ISP assigns you prefix 2003:1234:abcd:6600:: /56, how many bits do you have to create subnets ?
A. 4 bits
B. 8 bits
C. 12 bits
D. 16 bits
Answer: (B) 8 bits
Explanation:
IPv6:
Network ID (64 bits) | Interface ID (64 Bits) |
Network ID portion includes Global route prefix and subnet id bits.
Available bits to create subnets = Network ID bits - given prefix length
Given Address: 2003:1234:abcd:6600:: /56
Given network prefix length = 56
Available bits to create subnets = 64 - 56 = 8.
Bits in green color indicates network id bits.
Bits in red color indicates bits available for subnets.
(since hex value equal to 4 binary bits, number of bits available for subnets = 2 x 4 = 8)
Bits in blue color indicates host id bits. (16 x 4 = 64 bits)
Therefore, 8 bits are available to create subnets.
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