Question
You have a Class C network, and you need ten subnets. You wish to have as many
addresses available for hosts as possible. Which one of the following subnet masks
should you use?


A. 255.255.255.192


B. 255.255.255.224


C. 255.255.255.240


D. 255.255.255.248


E. None of the above
Answers
C
Explanation:
Using the 2n-2 formula, we will need to use 4 bits for subnetting, as this will provide for
24-2 = 14 subnets. The subnet mask for 4 bits is then 255.255.255.240.
Incorrect Answers:


A. This will give us only 2 bits for the network mask, which will provide only 2
networks.


B. This will give us 3 bits for the network mask, which will provide for only 6 networks.


D. This will use 5 bits for the network mask, providing 30 networks. However, it will
provide for only for 6 host addresses in each network, so C is a better choice.   Your Comment




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