Client-Server models have all the attributes just mentioned, plus the added abilities of advanced print queues, centralized backups and the ability to manage a greater user load.
It is the load of many users accessing resources as well as the demands of the extra features that typically require larger computers than the standard PC for these centralized resource sharing and management tasks. These larger computers are referred to as Servers, and the computers that access their resources as Clients or, alternately, workstations. All computers on a network, both servers and clients, are sometimes known as hosts, meaning systems which host the network communications. Servers are often based upon the same general hardware technology as a networks clients, although the hardware used generally features higher performance components and more memory and disk capacity than would normally be found on a client computer.
To offer additional features desirable in a centralized environment, servers often run a specialized version of an operating system (OS), called a network operating system (NOS). Network Operating Systems will be described in more detail in a later chapter.
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