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互联网基本工作英文(pdf 22页)

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互联网基本工作英文(pdf 22页)内容简介
Internetworking Basics
This chapter works with the next six chapters to act as a foundation for the technology discussions
that follow. In this chapter, some fundamental concepts and terms used in the evolving language of
internetworking are addressed. In the same way that this book provides a foundation for
understanding modern networking, this chapter summarizes some common themes presented
throughout the remainder of this book. Topics include flow control, error checking, and
multiplexing, but this chapter focuses mainly on mapping the Open Systems Interconnect (OSI)
model to networking/internetworking functions and summarizing the general nature of addressing
schemes within the context of the OSI model.
What is an Internetwork?
An internetwork is a collection of individual networks, connected by intermediate networking
devices, that functions as a single large network. Internetworking refers to the industry, products, and
procedures that meet the challenge of creating and administering internetworks. Figure 1-1
illustrates some different kinds of network technologies that can be interconnected by routers and
other networking devices to create an internetwork:
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