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Cisco Networking Essentials, 2nd Edition by Troy McMillan

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Chapter 8Classless IP Addressing

Chapter 7, “Classful IP Addressing,” introduced IP addressing. One important aspect of IP addressing is that for two devices to communicate with one another, the devices must be in the same network. An IP address has two parts: the network part and the host part. The network portion of the IP address must match on the two devices for communication to be ­possible, even if they reside on the same physical segment.

Much of what was discussed in Chapter 7 is characteristic of classful networking. This was the original design of IPv4 networking. In classful networking, there are three classes of IP addresses that may be assigned to individual devices. The size of the network in which a computer resides is a function ...

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