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CompTIA Linux+ Certification Guide by Philip Inshanally

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Subnetting

As we've just seen with the Classes A, B, and C, their subnet masks are /8, 16, and 24, respectively, using CIDR notation. In most environments today, these default subnet masks are known as classful, meaning if we use these subnet masks as they are, we would not be able to perform any sort of traffic engineering. This becomes an issue when we want to control the broadcast domain. We should try to minimize the broadcast to a given room, office, or department. This ensures that in the event of any type of network broadcast, the entire network does not start to experience latency. We can leverage subnetting in order to overcome the limitation of classful networks. For instance, let's pick a Class C IP address:

192.168.0.0/24

Based ...

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