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Chapter 12. TCP/IP Network Administration > Routing and Subnetting IP Networks

Routing and Subnetting IP Networks

Local area networks often grow beyond a single physical location. For example, your company may start out with one office location but then decide to expand the business and locate a satellite office in another part of town (or in another state, or in another country). When networks grow to the point where they are a collection of connected LANs at different locations, they are referred to as internetworks. So, an internetwork is a network of networks. And how are these different networks connected? They are connected by internetworking devices such as routers.

We discussed routing briefly in Chapter 3, “Networking Hardware,” in the section “Working with Network Connectivity Devices.” Routers such as Cisco routers use their own proprietary operating systems. In the case of Cisco routers, the OS is called the Internetworking Operating System or IOS. The IOS is used by the network administrator to configure the router and its interfaces and monitor the traffic on the internetwork.


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