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CCENT/CCNA ICND1 100-101 Official Cert Guide by Wendell Odom

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Rules for Grouping IP Addresses

The original specifications for TCP/IP grouped IP addresses into sets of consecutive addresses called IP networks. The addresses in a single IP network have the same numeric value in the first part of all addresses in the network. Figure 4-5 shows a simple internetwork that has three separate IP networks.

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Figure 4-5 Sample TCP/IP Internetwork Using IPv4 Network Numbers

The figure lists a network identifier (network ID) for each network, as well as a text description of the DDN values in each network. For example, the hosts in the Ethernet LAN on the far left use IP addresses that begin with a first octet of 8; ...

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