If block contains 32 IP address which of the following is first address of the block ?
(A)
10.0.0.5
(B)
10.0.0.16
(C)
10.0.0.68
(D)
10.0.0.160
Answer: (D)
Explanation:
As here block contains total IP addresses = 32
To represents all 32 IP address we need 5 bit so #of host bits=5.
Now, As It belongs to CLASS A we have to focus only on the last octet because in CLASS A host bit =8 bit.
5= 00000101
16= 00010000
68=01000100
160=10100000
AS #of host bits=5. so we have to only focus on the last 5 bits and for the first address all host bits must be 0’s.
Hence option(d) is correct.
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