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You need to subnet a network into 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

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You need to subnet a network into 5 subnets, each with at least 16 hosts. Which classful subnet mask would you use?

(a) 255.255.255.192

(b) 255.255.255.224

(c) 255.255.255.240

(d) 255.255.255.248

The question was posed to me in exam.

The doubt is from Designing Subnet Masks in division TCP/IP Protocol Suite of Computer Network

1 Answer

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Correct choice is (b) 255.255.255.224

For explanation I would say: You need 5 subnets, each with at least 16 hosts. The mask 255.255.255.240 provides 16 subnets with 14 hosts which is less than 15, so this will not work. The mask 255.255.255.224 provides 8 subnets, each with 30 hosts so this may work. The mask 255.255.255.192 provides 4 subnets, each with 60 hosts so this may work. Comparing both the possible masks, 255.255.255.224 provides the best answer.

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