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Protocol Paper

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Protocol Paper
NTC/362

The Open Systems Interconnection (OSI) protocol model is a reference model developed by the International Organization for Standardization (ISO) The ISO created the model to assist manufacturers in creating network devices and its software. It consist of seven layers in total. The first layer is the Physical Layer, at this layer communication between devices actually take place. Bits are sent and received across physical mediums like cable and radio waves. Hardware devices include hubs and repeaters. The next layer is the Data Link layer; it provides a reliable method for transmitting data across the communication link. It's broken up into two sub layers called the Logical Link Control (LLC) and the Media Access Control (MAC). LLC sub-layer handles error checking and flow control. It also is responsible for communicating with the Network Layer. MAC is the lower sub-layer and maps between logical (IP) and physical (MAC) addresses and access to the network media. Switches typically are a Layer 2 hardware device. The next layer is the network layer. Here IP addressing and routing of messages to their proper final destination occurs. Routers communicate at this layer, taking advantage of collision detection and forwarding packets based on the IP Address. The Transport Layer is the 4th Layer, it manages the data delivery between system or hosts. The communication protocols can be connectionless like User Datagram Protocol, UDP, or connection orientated like Transmission Control Protocol, TCP. In this layer data is broken up into segments. All segments are numbered assisting with reassembly after it delivered to the destination. Layer 5 is the session layer; it sets up, coordinates, and terminates conversations, exchanges, and dialogues between devices across the network. Sessions can be either Simplex, Half-Duplex,

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