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Service definitions, like the OSI Model, abstractly describe the functionality provided to an N -layer by an N-1 layer, where N is one of the seven layers of protocols operating in the local host. Retrieved 28 December In this model, a networking system was divided into layers. Some protocols are state- and connection-oriented. OSI was hence an industry effort, attempting to get industry participants to agree on common network standards to provide multi-vendor interoperability. OSI had two major components, an abstract model of networking, called the Basic Reference Model or seven-layer model, and a set of specific protocols. Protocol specifications define a methodology for communication between peers, but the software interfaces are implementation-specific.

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It provides for full-duplex , half-duplex , or simplex operation, and establishes procedures for checkpointing, suspending, restarting, and terminating a session.

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Neither of these protocols have anything to do with reservations. An Experimental Packet Switched System in the UK circa , also identified the need for defining higher level protocols. Detailed characteristics of TP classes are shown in the following table: [13]. In other projects Wikimedia Commons Wikiversity.

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