By Truman T.E.

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In this respect the use model is closer to that provided by the telecommunications industry, in which the user I/O device, the telephone, has little complexity and the network providers perform system support and maintenance. 27 Appearance of unlimited storage and computational resources – since applications and server processes run on servers on the backbone network, it is possible to run sophisticated applications and computationally-intensive I/O algorithms – speech and handwriting recognition, for example – without the cost or energy consumption incurred in providing local high performance computation.

Depending on the quality of service offered by the network layer, transport usually performs error correction and flow control. 3 Network Handles routing between peers, global naming and addressing, fragmentation and re-assembly. 2 Data Link For point-to-point connections, handles framing, station addressing, error control and flow control. Logical link control (LLC) Medium Access Control (MAC) 1 Physical For networks where transmitting stations share a common medium, the protocol governing access to the medium is separated into a sub-layer referred to in the IEEE standards as the media access control (MAC) layer.

OSI Protocol Layers Two dimensions of abstraction are present in this model: service abstraction and inter-layer communication abstraction. Between each pair of adjacent layers there is an interface that defines the primitive operations and services provided by the lower layer. Usually, a foremost objective is to specify the set of services that each layer offers, while abstracting the details of how these services are provided. Implicitly with this objective is the desire to limit dependencies between each layer to a set of interface primitives known as service access points (SAPs).

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