Finding All Subnet IDs
After the person designing the IP subnetting plan has chosen the one mask to use throughout the Class A, B, or C network, he will soon need to start assigning specific subnet IDs for use in specific VLANs, serial links, and other places in the internetwork that need a subnet. But what are those subnet IDs? As it turns out, after the network ID and one subnet mask for all subnets have been chosen, finding all the subnet IDs just requires doing a little math. This second major section of this chapter focuses on that math, which focuses on a single question:
Given a single Class A, B, or C network, and the single subnet mask to use for all subnets, what are all the subnet IDs?
When learning how to answer this question, you ...
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