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Introduction to Networking and the OSI Model （网络和OSI模型的介绍）.pdf

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Introduction to Networking and the OSI Model （网络和OSI模型的介绍）

ch01.qxd 1/3/2001 9:44 AM Page 1 O N E Introduction to Networking and the OSI Model In This Chapter Local Area Networks In this chapter, we begin our journey toward the CCNA Wide Area Networks certification by examining some networking concepts key to working with Cisco routers. The most important Internetworking concept is a discussion of the OSI model and how data The Seven Layers of flows across a network. Once the OSI model is under- the OSI Model stood, it will be easier to design, use, and, especially, troubleshoot Cisco networks. Introduction to Networking In the early days of computing, there were mainframe com- puters. These computers were large and centrally located, usually in a very cold and climate-controlled environment. Although processing was performed on the mainframe, the average user did not walk up to it and start an applica- tion. Instead, he or she would sit at a terminal that was con- nected to the mainframe by some type of cabling. This terminal, located in a remote location, was the gateway