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If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use?

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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

I have been asked this question in an interview for internship.

This interesting question is from Analyzing Subnet Masks topic in portion TCP/IP Protocol Suite of Computer Network

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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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