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Routing TCP/IP, Volume 1, 2/e by Jennifer Carroll Jeff Doyle

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Chapter 12. Default Routes and On-Demand Routing

Summarization has been examined in several chapters so far. Summarization conserves network resources by reducing the size of route tables and route advertisements. The smaller, simpler route tables can also make management and troubleshooting easier.

A summary address is an address that represents several, sometimes many, more-specific addresses. For example, the following four subnets

     192.168.200.128/27     192.168.200.160/27     192.168.200.192/27     192.168.200.224/27

can be summarized with the single address 192.168.200.128/25.

When examined in binary, ...

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