CCNA Discovery 1, Chapter 3
3.1.3 and 3.1.4: To create a network, you first set up hosts and connect peripherals to them. An example is a desktop with a scanner attached. Next you use some form of media to connect the hosts to a hub or switch. Other users can now share the peripheral devices over the network. To attach your local network to other networks, you connect a router. In addition, hosts can act as servers if you install specific software that enables the host to provide information. Just as a web server requires your computer to have a web browser, many network server applications require a client to run specific software.
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