Traduction et analyse de mots par intelligence artificielle ChatGPT
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Qu'est-ce (qui) est cycle server - définition
![client]] computers communicating with a '''server''' computer via the [[Internet]]](https://commons.wikimedia.org/wiki/Special:FilePath/Client-server-model.svg?width=200 "client]] computers communicating with a '''server''' computer via the [[Internet]]")
![Sun's [[Cobalt Qube]] 3; a computer [[server appliance]] (2002); running Cobalt Linux (a customized version of Red Hat Linux, using the 2.2 Linux kernel), complete with the Apache web server.](https://commons.wikimedia.org/wiki/Special:FilePath/Cobalt Qube 3 Front.jpg?width=200 "Sun's [[Cobalt Qube]] 3; a computer [[server appliance]] (2002); running Cobalt Linux (a customized version of Red Hat Linux, using the 2.2 Linux kernel), complete with the Apache web server.")
![WWW]] server is located at [[CERN]] with its original sticker that says: "This machine is a server. DO NOT POWER IT DOWN!!"](https://commons.wikimedia.org/wiki/Special:FilePath/First-server-cern-computer-center.jpg?width=200 "WWW]] server is located at [[CERN]] with its original sticker that says: \"This machine is a server. DO NOT POWER IT DOWN!!\"")
![rack-mountable]] server with the top cover removed to reveal internal components](https://commons.wikimedia.org/wiki/Special:FilePath/Inside and Rear of Webserver.jpg?width=200 "rack-mountable]] server with the top cover removed to reveal internal components")
![A network based on the '''[[client–server model]]''' where multiple individual ''clients'' request services and resources from centralized servers](https://commons.wikimedia.org/wiki/Special:FilePath/Server-based-network.svg?width=200 "A network based on the '''[[client–server model]]''' where multiple individual ''clients'' request services and resources from centralized servers")
![[[Wikimedia Foundation]] rackmount servers on racks in a data center](https://commons.wikimedia.org/wiki/Special:FilePath/Wikimedia Foundation Servers-8055 35.jpg?width=200 "[[Wikimedia Foundation]] rackmount servers on racks in a data center")
Wikipédia
In computer networking, upstream server refers to a server that provides service to another server. In other words, upstream server is a server that is located higher in a hierarchy of servers. The highest server in the hierarchy is sometimes called the origin server—the application server on which a given resource resides or is to be created. The inverse term, downstream server, is rarely used.
The terms are exclusively used in contexts where requests and responses move in opposite ways. It is not used when discussing hierarchical routing or hierarchical network topologies, as packets can be transferred both ways.
For example, in the domain name system, a name server in a company's local area network often forwards requests to the internet service provider's (ISP's) name servers, instead of resolving the domain name directly — it can be said that the ISP's name servers are upstream to the local server. Conversely, the ISP's servers typically resolve domain names from the domain's authoritative origin servers — the authoritative servers are said to be upstream to the ISP's servers. Note that the hierarchy of resolvers is unrelated to the actual domain name hierarchy.
