Prepherals devices

The network devices that people are most familiar with are called end devices. These devices form the interface between the human network and the underlying communication network. Some examples of end devices are:
• Computers (work stations, laptops, file servers, web servers)
• Network printers
• VoIP phones
• Security cameras
• Mobile handheld devices (such as wireless barcode scanners, PDAs)
In the context of a network, end devices are referred to as hosts. A host device is either the source or destination of a message transmitted over the network. In order to distinguish one host from another, each host on a network is identified by an address. When a host initiates communication, it uses the address of the destination host to specify where the message should be sent.
In modern networks, a host can act as a client, a server, or both. Software installed on the host determines which role it plays on the network.
Servers are hosts that have software installed that enables them to provide information and services, like e-mail or web pages, to other hosts on the network.
Clients are hosts that have software installed that enables them to request and display the information obtained from the server.