is chapter introduces routing which passes network trac from one network to
another network. A routing protocol can be used to automatically update the routing
table and to nd the shortest path from a source network to a destination network.
is chapter explains how a router can accomplish these tasks. It introduces the NAT
service which allows computers with private IP addresses to share a single public IP
Figure 9.46 Specifying private interface.
Figure 9.47 Private IP address assigned by NAT.
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