Central server

In Data-processing, a central waiter centralizes a service. The central servers are used generally in a centralized architecture a contrario of a decentralized architecture. One speaks about central server in a network of users or machines. There exist various types of centralization:

the centralization of data - which stores the whole of the data on a waiter concerning the unit of the elements of the Data-processing network;
the centralization of direction - where only one waiter decides of which machine or which user does what and when;
the centralization of communication - all the communications pass through the central server.

The centralization of data, direction and communication was in the beginning the main organization of the data-processing networks.

In the Years 1980, all the users connected to the central server of an entity by a Computer terminal . This very practical structure for the organization, presents however security issues of the network:

if the central server breaks down the network does not function any more;
the hacking has only one target;
if there are many simultaneous connections punctually not envisaged, then the central server can saturate.

In the Années 1990 the central server underwent a change. Indeed it is not alone any more, it exists waiters of proximity waiters of safeguard which work all and sundry. It does not organize really any more the network, it does not centralize any more the data, nor the communications. The central server has vocation only referencing. I.e. it reference the whole of the waiters so that those can be informed of the others. In fact, the central server passed from machine to do everything with central directory.

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