OSI model seven layers

OSI model seven layers - PHYSICALLAYER...

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The 7 layers of the OSI model PHYSICAL LAYER The lowest layer of the OSI model is the physical layer and is involved with the transmission and reception of the  unstructured raw bit stream over a physical medium, describing the electrical/optical, mechanical, and functional interfaces  to the physical medium. It also carries the signals for all of the higher layers.  Its potential functions are data encoding,  physical medium attachment, transmission technique, and physical medium transmission. DATA LINK LAYER The data link layer provides error-free transfer of data frames from one node to another over the physical layer, allowing  layers above it to assume virtually error-free transmission over the link. Its basic functions are link establishment and  termination, frame traffic control, frame sequencing, frame acknowledgement, frame delimiting, frame error checking, and  media access management. NETWORK LAYER The network layer controls the operation of the subnet and decides which physical path the data should take based on the  conditions of the network, priority of service, and other factors. Some of the functions that this layer provides are routing,  subnet traffic control, frame fragmentation, logical-physical address mapping, and subnet usage accounting.  TRANSPORT LAYER The transport layer ensures that messages are delivered error-free, in sequence, and with no losses or duplications. It 
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This note was uploaded on 08/12/2011 for the course IT 240 taught by Professor Jamesmiller during the Spring '11 term at University of Phoenix.

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OSI model seven layers - PHYSICALLAYER...

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