Summary
Having completed this chapter, you should be comfortable with the OSI networking model and should have a basic understanding of how bridges and switches, routers, and access servers work. Next, Chapter 2 introduces you to the basics of configuring a Cisco device. Keep in mind the following central concepts from this chapter:
The Cisco IOS is the operating system that runs Cisco devices.
Cisco devices covered in this book operate at three layers of the OSI reference model: physical, data link, and network.
The Cisco IOS uses protocol information at each layer of the OSI reference model.
Bridges and switches operate at the data link layer and connect multiple data link layer network segments into a single logical network segment.
Routers operate ...
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