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What is OSI Model?

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The OSI Model is used to describe networks and network application.

What is OSI Model?

The OSI Model is used to describe networks and network application.

Layers of OSI  Model 

Three are Sever Layers of OSI Model :

OSI Layer Diagram:

  

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.

6) Presentation Layer : The Presentation layer is responsible for protocol conversion, date encryption/decryption, Expanding graphics command and the date compression. This layer makes the communications between two host possible.

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.

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.

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.

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.

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.

How to remember the layer of OSI model?

The easiest way to remember the different layers of OSI Model is to use the mnemonic "All people seem To need Data Processing":

Layer Name  
Mnemonic
7 Application All
6 Presentation People
5 Session Seem
4 Transport To
3 Network Need
2 Data Link Data
1 Physical Processing

 

 

 

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Posted on: February 15, 2008

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Comments:85
Praveen Sharma
January 6, 2013
osi mosi model related all topic

i want related osi model and networking all detail clear concept
harish nanda
August 28, 2013
osi model

i understand all seven layers but here is not practical exanmple . i thing practical is very helpful to understand these type of topics..................
Ourab Paul
August 26, 2013
feedback

it is quite nice but there is no difference between this and what they print in the books. some examples would be highly appreciated
Jitendra kulshreshtha
August 26, 2013
OSI model

It's good but not in detail so we can elebolrate it
tamilselvan
December 23, 2013
networking management

it is very use ful one my subject
piyush jadav
August 20, 2014
networking

no comment
naveen kumar
September 14, 2011
networking

i want to know what is the use in topology in networking and without topology we can not use the net yes and not
naveen kumar
September 14, 2011
networking

what is the computer concept and what is the networking concept what is the means of it
Akash agrwal
December 7, 2011
OSI MODEL

it very very impertont for my life for knowege .
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