© Chris Carthern and William Wilson and Noel Rivera 2021
C. Carthern et al.Cisco Networkshttps://doi.org/10.1007/978-1-4842-6672-4_1

1. Introduction to Practical Networking

Chris Carthern1  , William Wilson2 and Noel Rivera3
Bangkok, Krung Thep, Thailand

This chapter begins by discussing a few of the tools that you will use throughout the book. Next, we cover the OSI (Open Systems Interconnection) model and discuss how it relates to networking. We talk about all seven layers of the OSI model. Then we move on to the TCP/IP model and show its relation to the OSI model. We end the chapter discussing well-known port numbers, the different types of networks, and Cisco’s hierarchical internetwork model.

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