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Unit Contents
Overview 
In Unit 1, we discussed the types of devices that can communicate over a network. In this unit, we consider the physical qualities of the network itself. We begin by discussing the nature of electronic communication and explain how information can be transmitted as analog or digital signals. We then explore the various physical layouts or topologies of data networks, and show how the pattern of signal flow depends on the topology of the network. We then describe the characteristics of the three main types of physical transmission media used in networks: copper cable, fiber optic cable, and wireless communication (radio waves). We will learn how signals travel over each media, and their relative advantages and disadvantages. As you work through this unit, it is important to remember that there is no "best" network topology or physical medium. A network designer's choice of topology and cabling (or lack of it) is determined by the type of work the network must do, and the type of physical environment it must work in.
Terms You Should Know
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