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Computer Networks
Analyzing Subnet Mask
Q
If you wanted to have 12 subnets with a Class C network ID, which subnet mask would you use?
AA. 255.255.255.252
BB. 255.255.255.255
CC. 255.255.255.240
DD. 255.255.255.248
Correct Answer:
C. C. 255.255.255.240
Explanation:
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.
