1.

If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use?(a) 255.255.255.252(b) 255.255.255.255(c) 255.255.255.240(d) 255.255.255.248

Answer» The correct choice is (c) 255.255.255.240

To explain I would say: If you have eight networks and each requires 10 hosts, you would use the Class C mask of 255.255.255.240. Why? Because 240 in binary is 11110000, which means you have four subnet bits and four host bits. Using our math, we’d get the following:

24-2=14 subnets

24-2=14 hosts.


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