Open System Interconnection (OSI) Essay Example | Topics and Well Written Essays - 1250 words

Open System Interconnection (OSI) - Essay ExampleThe data charm or lower layers of the OSI specimen handle data transport issues and argon implemented in hardware and software. The utmost layer, the physical layer, is responsible for actually placing information on the medium. As a side note, most systems directly use a modified version of this model for example transmission control protocol/IP uses a 6-layer model.The OSI model is generic and is not a communication model -it makes no assumptions about programming language bindings, run system bindings or application and user port issues. Communications are implemented through protocols which are a formal set of rules and conventions that govern how computers exchange information over a vane medium. A protocol implements the functions of one or more of the OSI layers. The table below describes the role of for each one of the 7 layers in greater detailResponsible for activating, maintaining and deactivating the physical link bet ween network objects. Network larboard cards and interfaces on routers run at this level. Physical layer specifications define characteristics such as emf levels, time of voltage changes, physical data counts, maximum transmission distances, and physical connectors. Physical layer implementations drive out be categorized as either LAN or WAN specifications.When an application on Computer 1 s overthrows dat... Provides error checking, error recovery and flow control. The transport protocols used on the Internet are TCP and UDP.3Network LayerMakes the upper layers independent of the data transmission, switching technologies, and topology of the network. Determines which path(s) in the network that data will be routed.This layer is very important to the design and configuration for internetworking. IP and routing protocols plump here.2Data Link LayerProvides reliable transfer across the physical links. Establishes the beginning and end of blocks of data (with synchronization whe n necessary) Reorder frames which are out of sequence framingerror detection and correctionrate of data transmission flow control.It is subdivided into the logical Link Control (LLC) and Media Access Control (MAC) sub layers. Bridges and switches interface here.1Physical LayerResponsible for activating, maintaining and deactivating the physical link between network objects. Network interface cards and interfaces on routers run at this level. Physical layer specifications define characteristics such as voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, and physical connectors. Physical layer implementations can be categorized as either LAN or WAN specifications.electricaloptical automaticWhen an application on Computer 1 sends data to Computer 2 that data passes through each layer of the OSI model on Computer 1 until it gets to the Physical layer. At that point it is transmitted on the physical medium (e.g. cabling) across to the Physical layer on Computer 2. The data then passes up through the Physical, Data, Network, Transport, Session, Presentation and