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A host (also called a client) does this. The device that provides the information a host is looking for is called a server.
Switch
A network client is any device that requests resources/information from another device.
node
node
nodes
node
One device that is shared on the network is a router. This is the one that will connect the various devices to the shared network.
The trackball would be an input device. Any device that takes information from the outside world into the computer is an input device. Any device that takes information from the computer and gives it to the outside world (such as a monitor or printer) is an output device.
NIC (Network Interface Card)
A device on a network are gateway, router, bridge, switch, hub, repeater, multilayer switch, protocol converter, bridge router, digital media receiver, proxy, firewall, and network address translator. A computer on a network is called a networking computer. http://en.wikipedia.org/wiki/Computer_networking_device
A router is required to communicate between two or more different networks. To communicate with an 'outside customer' (network), information must travel to a different network. A router facilitates this.