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An organization has a class C network and wishes to from subnet for 32 departments. The subnet mask would be:-

1. $255.255.255.248$
2. $255.255.255.252$

I guess it should be A. As it is a class C network we have 24 bits for the network Id part . Now we are left with 8 bits. As we want subnets for 32 networks so we have to reserve 5 bits for the subnet Id part . So for subnet mask we have  all 1's in place of NID and SID and rest all 0's. So we get: 1111 1111:1111 1111:1111 1111:1111 1000=255:255:255:248

The requirement is just according to the present scenario, it may be the case that organization will require more in future.

I think in the question along with subnet they should also ask no of hosts in each subnet then it would be more clear.
ya.. It would have been more clear then but if it is not specified I guess we have to do it according to the present scenario

I think in the question along with subnet they should also ask no of hosts in each subnet then it would be more clear.

yes, we can prefer b also as subnet mask, due to our requirement is 32 subnets and it gives us 64 subnets, which satisfies us... but there is a better option which will give exactly 32 subnets, then it is preferrable !

Ans is A

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