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Client-server - a network methodology where one computer has the main processing power and storage and the other computers act as clients requesting services from the server.
Peer-to-peer - a network methodology where all devices in a network share resources between them rather than having a server. In a peer-to-peer network, no one computer is in overall control of the network. Instead the resources of each computer or workstation are available to all the computers in the network. Each workstation therefore can act either as a client or a server, depending on the current task. This more common among smaller networks on for certain applications such as file sharing.