Internehvorking Exaluple
Depicts a configuration that we will use to illustrate the interactions amongprotocols for internetworking. In this case, we focus on a server attached to an ATM
WAN and a workstation attached to an IEEE 802 LAN, with a router connecting the
two networks.2 The router will provide a link between the server and the workstation
that enables these end systems to ignore the details of the intervening networks.
Figures 4.6 through 4.8 outline typical steps in the transfer of a block of data,
such as a file or a Web page, from the server, through an internet, and ultimately to
an application in the workstation. In this example, the message passes through just
one router. Before data can be transmitted, the application and transport layers in
the server establish, with the corresponding layer in the workstation, the applicable
ground rules for a communication session. These include character code to be used,
error-checking method, and the like. The protocol at each layer is used for this purpose
and then is used in the transmission of the message.
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