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Cisco CCNA Routing and Switching 200-120 Exam Cram, Fourth Edition by Keith Barker, Michael Valentine

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Chapter Two. Network Models

This chapter covers the following official CCNA Routing and Switching 200-120 exam topics:

Describe the purpose and basic operation of the protocols in the OSI and TCP/IP models.

Predict the data flow between two hosts across a network.

Identify common applications and their impact on the network.

Any complex operation requires a certain degree of structure to be understood. When dealing with millions of individuals all designing and building programs, protocols, and equipment that is intended to network together, the use of a theoretical model as a basis for understanding and interoperability is critical. This chapter reviews the Open Systems Interconnection (OSI) model and compares it to the TCP/IP model. ...

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