CHAPTER 2. The Open Systems Interconnect Model
Introduction
To prepare for the Cisco Certified Network Associate (CCNA) exam, you should begin by reviewing the foundations of networking. Among these, you must understand the logical models on which networks are designed and created, the protocols they use to communicate, the addressing schemes by which they identify individual devices on the network, and the technologies they use to ensure that data reaches its destination. In this chapter, we will cover the Open Systems Interconnect (OSI) model in depth and then begin the discussion on Transmission Control Protocol/Internet Protocol (TCP/IP). Both are covered in great detail on the exam and need to be completely understood before sitting the exam ...

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