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plzz give the explaination also...

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class B network has Subnet Mask 255.255.0.0=11111111.11111111.00000000.00000000

Subnets required 64=26

So, Subnet Mask for 64 departments will be 11111111.11111111.11111100.00000000=255.255.252.0

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Class B has 16 network bits and rest 16 host bits.

Subnettting is done by chossing bits from host. So in order to make 64 subnets we have to carry log2(64)= 6bits from host.

Now look NID.NID.XXXXXXXX.XXXXXXXX we carry 6 bits and we know subnet mask contain 1 for NID and subnet bits and 0 for host bits so Mask will be 11111111.11111111.11111100.00000000 : 255.255.252.0

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