An organization has a class B network and wishes to form subnets for 64 departments. The subnet mask would be
A
255.255.0.0
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B
255.255.128.0
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C
255.255.252.0
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D
255.255.64.0
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Solution
The correct option is C 255.255.252.0 In a class B network initial two octets are all 1's but the third octet specifies the physical network for subnet of 64 department or 26 so initial 6 bits of third octets are l's 11111111⋅11111111⋅11111100⋅00000000255⋅255⋅252⋅0