OSI MODEL [Computer Networks]

The Open Systems Interconnection model (OSI model) was a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a way of sub-dividing a communications system into smaller parts called layers.The OSI Model is a model that illustrates how data communications should take place.

It segregates the process into seven group of Layers given above..........

1) Physical Layer : Physical Layer is responsible for transmitting row bit stream over the physical cable. The physical layer defines the hardware items such as cables, cards, voltages etc.

2) Data Link Layer : Data link layer is responsible for controlling the error between adjacent nodes and transfer the frames to other computer via physical layer. Data link layer is used by hubs and switches for their operation.

3) Network Layer : This layer is responsible for translating the logical network address and names into their physical address ( MAC address). This layer is also responsible for addressing, determining routes for sending and managing network problems such as packet switching, data congestion and routines

4) Transport Layer : This layer is responsible for end-to-end delivers of messages between the networked hosts. It first divides the streams of data into chunks or packets before transmission and then the receiving computer re-assembles the packets. It also guarantee error free data delivery without loss or duplications.Protocols found at this layer include TCP, UDP.

5) Session Layer : This layer is responsible for establishing the process-to-process communication between the host in the network. This layer is responsible for establishing and ending the sessions across the network. The interactive login is an example of services provided by this layer in which the connective are re-connected in care of any interruption

6) Presentation Layer : The Presentation layer is responsible for protocol conversion, Encryption and compression should be Presentation Layer functions. This layer makes the communications between two host possible.

7) Application Layer : The application layer provider different services to the application. Example of services provided by this layer are file transfer, electronic messaging e-mail, virtual terminal access and network management. This is the layer with which the user interacts.

At Last I would give You a Tip to Remember these 7 Layers.....

How to remember the layer of OSI model?

Ans: The easiest way to remember use the mnemonic

"All people seem To need Data Processing"

@Gaurav Kapoor [VSoftTechnologies]