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As it examines the packet’s destination protocol address, the router determines that it either knows or does not know how to forward the packet to the next hop. If the router does not know how to forward the packet, it typically drops the packet. If the router knows how to forward the packet, it changes the destination physical address to that of the next hop and transmits the packet. The next hop may, in fact, be the ultimate destination host. If not, the next hop is usually another router, which executes the same switching decision process.

Host-intelligent systems choose the better routes more often, because they typically discover all possible routes to the destination before the packet is actually sent. ” The act of determining all routes, however, often requires substantial discovery traffic and a significant amount of time. Intradomain Versus Interdomain Some routing algorithms work only within domains; others work within and between domains. The nature of these two algorithm types is different. It stands to reason, therefore, that an optimal intradomain- routing algorithm would not necessarily be an optimal interdomain- routing algorithm.

WAN Switch A WAN switch is a multiport internetworking device used in carrier networks. 25, and SMDS and operate at the data link layer of the OSI reference model. Figure 3-5 illustrates two routers at remote ends of a WAN that are connected by WAN switches. Two routers at remote ends of a WAN can be connected by WAN switches. WAN Switch 12326 Figure 3-5 Introduction to WAN Technologies 3-5 WAN Devices Access Server An access server acts as a concentration point for dial-in and dial-out connections.

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Cisco Internetworking Technology Overview


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