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) 255.255.255.248
C) 255.255.255.240
D) 255.255.255.254
C
Explanation: C) The 255.255.255.240 or /28 mask provides for 4 subnet bits and 4 host bits, providing a total of 16 available subnets. The next lowest mask, 255.255.255.224 or /27, will provide 3 subnet bits and 5 host bits, providing only 8 available subnets.
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