i have a doubt that , in our college computer lab we are using class A ip address (private ip) but subnet mask as class B's subnet so i wanna know wats the relation between it..? simply my question is how to configure private ip address

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You can apply any subnet mask you wish to any IP address regardless of the "class".

Routing by "class" is a thing of the past.

http://en.m.wikipedia.org/wiki/Classless_Inter-Domain_Routing

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Using a class A for a network would be crazing using the default mask (also inefficient due to the size of the broadcast domain). The potential would be for over 16 million devices. This would be a waste of addresses. Therefore when using a class A like 10.0.0.1 it's logical to use a 16 bit, 255.255.0.0 or 24 bit 255.255.255.0 mask. It makes the network more efficient becuase it reduces the size of the broadcast domain. It also stops you running out of IP addresses.

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