Wednesday, December 26, 2018




OSI Model In Computer Network  :-

OSI (Open Systems Interconnection)  reference model is a 7 layers model designed  by ISO(International Standards Organization) . To aid in the development and understanding and communication it is a 7 layer communication protocol intended as a standard for the development  of communication system world wide.

Describe different OSI layer function ( OSI Layer Architecture ) :-

1. Physical layer :-  the physical layer makes by a physical and electrical characteristic  of the network .  network hub, termination ,cable, repeater are the devices associate with physical layer.

2. Data link layer :- it’s defined the access stage for sharing the physical medium . data link , protocol and switch is associate in data link layer.

3.Network layer :- the network layer makes routing decision and forward Packet for device and connect two network devices by a link communicative directly . router and gateway works in the network layer.

4. Transport layer :- this layer is responsible for converting  massage into the structures  required for transmission over the network. TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two very common protocol which works in this layer.

5. Session layer :- it’s provides for two communicating presentation exchanges data with each other. There required to understand when a session is taking place. full duplex or half-duplex, netBIOS , PAP , SQL works in this session layer.

6. Presentation layer :- this is where application data is either pack or unpacked , ready for the use by the running application.    MIME , XDR , ASN.1 , TLS , SSL works in the presentation layer.

7. Application layer :- this is where we find our end user and end application protocol such as telnet, FTP , HTTP, HTTPS, SMTP etc.

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