Data-processing Waiter

The Architecture customer waiter indicates means of communication between Logiciel S. software customers sends a request to a server software which answers him, the whole following a Communication protocol .

By abuse language, one calls data-processing waiter a machine which makes turn a server process program.

A data-processing waiter , called waiter when the context lends itself to it, is a Ordinateur or a Computer program which renders service to the computers and software which are connected to it through a Data-processing network, the customers. This service can consist in storing file S, to transfer the Email, to lodge a Web site, etc It is possible for a computer to be customer and waiter at the same time.

The terms customer and waiter come owing to the fact that a customer is petitioning of a service and that a waiter renders this service.

Connection Client-serveur uses Communication protocols, such as for example TCP/IP, which is the protocol more used on Internet.

History

At the beginning the users reached the waiters by final passive generally alphanumeric (the minitel is an example) and thereafter with some graphic capacities. This time left to people the concept of powerful Central server supporting weak customers, not being able anything almost to make, but holding the capacity. Today, whereas there exist laptops much more powerful than large the host computers of the Années 1970, and which can be used as customers to sail on the World Wide Web, this can lend to confusion.

The evolution of the setting in network can be summarized in three phases:

Initially, a network is centralized: the waiter (only element of calculation) is the heart of the network, around revolve the terminals, sometimes very many.
In the second time, with the beginning of the year the 1980 terminals are replaced by active machines (GCV). The waiter is not then any more a machine, but a program. On the same machine several waiters and several customers can be at the same time. In the operating system Linux for example, the graphic screen is managed on the mode customer waiter. The waiter provides a customer service, it is not more symbol of being able. The image of the waiter in a brewery is appropriate better: the customer asks him for a beer, and it brings it. On Internet, any machine can be at the same time and at the same time customer and waiter.
In the third time, in the middle of the years the 1990 extensions of architecture Client waiter will explore two directions: the delegation (a waiter is addressed to another waiter, as in the architecture 3 or N-third ), and the rich customer .

List waiters

Web server
Central server
Waiter of application
File server
Print server
Database server

List services

Waiter HTTP
electronic Waiter DNS
Mail server
Waiter its
Waiter ftp

See too

External bonds

Server Guides Share 1: Introduction to the Server World , AnandTech, visited the August 20th 2006
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