This section discusses IP addressing design. First, we examine how to determine how many IP addresses are needed in a network. We next discuss the use of private addresses. If private addresses are used in a network that also requires Internet connectivity, Network Address Translation (NAT) is also needed, so the various features of NAT are described. This is followed by a discussion of how routers use IP subnet masks. We next show you how to determine the subnet mask to use within a network. Assigning IP addresses in a hierarchical way allows them to be summarized, which has many benefits. These benefits are examined, and route summarization calculations are illustrated. The use of variable-length subnet masks (VLSMs) can help you to use your available IP address space more efficientlyan explanation of VLSMs concludes this section.
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