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Lesson 1 - Devices on NetworksInternetworking DevicesThus far, we have discussed network nodes that actively use a network to communicate. For example, some computers need information and other computers supply that information. Or a user on one computer transfers files or messages to a user on another computer. In this way, these network nodes are like buildings along city streets. However, some form of traffic control is necessary to keep the traffic flowing smoothly between all the nodes. In other words, our network "streets" need intersections, traffic lights, and occasional safety barricades. A special category of network nodes, called internetworking devices, performs these functions. Internetworking devices are part of the basic infrastructure of a network. When these devices are properly set up and managed, users never notice them. However, the choice and placement of these devices can have a big effect -- good or bad -- on the way a network performs. We will discuss these devices in more detail later in this course. ActivitiesSee the Activities and Extended Activities section in Unit 1 Lesson 1 in your textbook Introduction to Networking to test what you have learned so far.
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