Cisco Internetworking Technology Overview

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In addition, the role of routing protocols is briefly contrasted with the roles of routed or network protocols. ” What is Routing? Routing is the act of moving information across an internetwork from a source to a destination. Along the way, at least one intermediate node typically is encountered. Routing is often contrasted with bridging, which might seem to accomplish precisely the same thing to the casual observer. The primary difference between the two is that bridging occurs at Layer 2 (the link layer) of the OSI reference model, whereas routing occurs at Layer 3 (the network layer).

Carrier Network Switch DCE DCE WAN Customer Premises 12324 DCE Packet Switching Packet switching is a WAN switching method in which network devices share a single point-to-point link to transport packets from a source to a destination across a carrier network. Statistical multiplexing is used to enable devices to share these circuits. 25 are examples of packet-switched WAN technologies (see Figure 3-4). Introduction to WAN Technologies 3-3 WAN Virtual Circuits Figure 3-4 Packet switching transfers packets across a carrier network.

The primary advantage of hierarchical routing is that it mimics the organization of most companies and therefore supports their traffic patterns well. Most network communication occurs within small company groups (domains). Because intradomain routers need to know only about other routers within their domain, their routing algorithms can be simplified, and, depending on the routing algorithm being used, routing update traffic can be reduced accordingly. Host-Intelligent Versus Router-Intelligent Some routing algorithms assume that the source end-node will determine the entire route.

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