You are configuring the IPv6 network infrastructurefor a branch office.
The corporate network administrator allocates the 2001:DB8:0:C000::/58 address space for use in the branch
office.
You need to identify the maximum number of IPv6 subnets you can create.
How many IPv6 subnets should you identify?
A.
32
B.
64
C.
128
D.
1024
Confirmed.
Prefixlen # blocks # /64 subnets per block
48 1 65,536
49 2 32,768
50 4 16,384
51 8 8,192
52 16 4,096
53 32 2,048
54 64 1,024
55 128 512
56 256 256
57 512 128
58 1,024 64
59 2,048 32
60 4,096 16
61 8,192 8
62 16,384 4
63 32,768 2
64 65,536 1
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64-58=6 so 2^6=64
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0
Is this formula ?
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yes thank you for helping me Syed
the subnet mask part of an ipv6 address is the fourth hextet this ranges from bits /48 to /64
/58 bits are already used for the base address so we have 64-58= 6 bits left for for the new subnets
2 to the power of 6 = 64 subnets
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