IP Addressing Categories and IP Address Adjuncts

We just explored how the 32 bits in an IP address are fundamentally divided into the network ID and host ID. The network ID is used for routing purposes, and the host ID uniquely identifies each network interface on the network. In order for devices to know how to use IP addresses on the network, they must be able to tell which bits are used for each ID. However, the dividing line is not predefined. It depends on the type of addressing used in the network.

Understanding how these IDs are determined leads us into a larger discussion of the three main categories of IP addressing schemes: classful, subnetted, and classless. Each of these uses a slightly different system of indicating where in the IP ...

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