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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
nasreen
April 2, 2011
computer network

what is osi model
sylvester panyani
June 6, 2011
coment

this is so nice
M.Mazhar
June 12, 2011
OSI Model

I totally understand this topic but here is not any practical example
kokila
July 8, 2011


its very nice
kokila
July 8, 2011


its very nice
kokila
July 8, 2011


its very nice
BUKENYA
June 29, 2011
OSI in full

define OSI in full
Atul karmyal
August 18, 2011
Network Layer

How can we enhance the reliability of the Transport Layer?
Amol
August 26, 2011
Osi models

Excellent.....!!!!!!
KN ARUN KUMAR
June 3, 2013
OSI MODEL

To remember different layers of OSI Model is to use the mnemonic APSTNDP Layer Name Mnemonic 7 Application A 6 Presentation P 5 Session S 4 Transport T 3 Network N 2 Data Link D 1 Physical P
mohd ashiq
September 1, 2011
network

give imformation about network.......................... and more about computer
priya
September 4, 2011
computer networking of bba 5th sem

all detail of osi model send meplz
SAGAN
September 11, 2011
osi model

hello how are you.
manish kumar
September 13, 2011
mcse persuing

R/sir i wants to attract your kind attention from these line where you mention that osi model has (sever) layer in the place of seven layers.pls cheak the word and make it right.Thanks
naveen kumar
September 14, 2011
networking

i want to know what is the use of osi layaer in networking could you tell me .and one hub router use how many computer connted to network and tell me what is the use of ip address in networking so kindly tell me in bref explation
SANTOSH SAMPAT SAPKAL
September 22, 2011
HARDWWARE NETWORKING

I AM JUST LEARNING HARDWARE NETWORKING. I WANT MORE USE FULL INFORMATION FOR THE BEST OF MY KNOWLEDGE. OK IT IS VERY VERY NICE ARTICLE. THANKS!
satwant singh
September 25, 2011
"o: Level

OSI
Resham Thapa
October 1, 2011
What is OSI model ?

OSI model stands for Open System Interconnection. it provides a description of how network hardware and software work together in ayered fashion to make communication possible. it also helps with trouble shooting by providing a frame of reference that describe how components are supposed to function.
Michael Davis
October 6, 2011
Layer 2 (Data Link)

Minor correction. Hubs do not use the data link layer, they do not have a cam table or read layer 2 addresses to store and forward frames. Switches use the data link layer, hubs do not. They operate at Layer 1 of the OSI model and just repeat the physical signals they recieve out to all ports except the port the signal came in on.
satyam
February 7, 2013
osi

this is nice chapter
suryakant
October 19, 2011
osi model protocols

osi model
Vijay Kishore
October 23, 2011
Appreciation

Gave a good shortcut to remember the Layers.....
David
October 24, 2011
Grammar errors

You've got quite a few grammar errors in the 'What is OSI Model?'. Just a suggestion to clean it up.
md.fazlul karim
October 24, 2011
layer

bit
hem singh
November 3, 2011
full refrence of osi

dear guy, i like to get either any link or or on line book which can make me full expert in osi module. it is heard that for leading in ccie we must have comprehensive knowledge of osi and there is integral role of osi. All info. regarding osi which can assist me to becoming ccie. please i will be grateful to have the info. thx hem
yogesh saraf
November 8, 2011
All information about OSI MODEL .

Hi,This is yogesh saraf i was thinking about osi model functioning and working .
aa
November 17, 2011
OSI Model

very brief and Excellent Notes
preeti
November 19, 2011
computer network

nice and easy language and concepts to understand.
sanjay mohapatra
November 22, 2011
understood

Dear sir, I have understood,what is OSI module. Thank you...
ali
December 3, 2011
it

good write and meaningfull or squntillay
preeti thakur
December 7, 2011
OSI Model

like
varun
December 14, 2011
osi model

like
Lucky kapoor
December 23, 2011
Operating System and Networking With OSI modal.

Please describe Networking with OSI modal this is very important for me.
pramanand
December 29, 2011
ccna

i like subject ccna
shakur
January 10, 2012
mcse , ccna ,linux & hardwear and networking

i want to nots of CCNA , MCSE , LINUX & HARDWEAR AND NETWORKING. pleas send me
Rohit
January 15, 2013
Osi Modal

Hi Please Check
nyuvasri
January 15, 2012
urgent

i want more and clear explanation
nadeem akhtar
January 21, 2012
nice

its verry good data about osi layer model i read all the data .......
jatinder
January 26, 2012
judfing

osi model is better for design network system
hemant kadolkar
January 30, 2012
thnks for this pages

i not good write,read english..you had very write OSI LAYERS. THANKS.
vaibhav upadhyay
February 3, 2012
osi model

plz send me full osi model (seven layer) for my presentation with cross queries.....thaxxxx
kapil dev
February 10, 2012
mcse and ccna

plz help me i want to solve my some questions.
patil satish
February 11, 2012
networking

very good answer
Anjali Kumari
February 11, 2012
To ask about osi model in depth.

What is the purpose of OSI model? Why we use osi model? What type of model we use today? I mean to say whether it is tcp/ip or osi model. what is the difference between osi reference model and osi model?
ESSUMAN DANIEL
February 15, 2012
STUDY ON CCNA

I LOVE YOUR SITE
raj
February 21, 2012
osi

qury the qustion
sana
March 7, 2012
communication protocol

This artical help me to remember osi layers name as well as osi layer description thankxxxxxxxxxxxxx.
terry-ann evans
February 28, 2012
osi model

it seen to be much more to learn
sanjivani dange
March 2, 2012
osi model

OSI model
udayakumar
March 2, 2012
osi layers

osi layers connection with ccna all detail send me my mail
imran
March 3, 2012
osi model

it has been written easy language someone who face the difficult job for understan them. it is made understand is easly way,,,,,,,,
Aden Sagar
April 26, 2012
osi model

How do they comunicate all layer
Er Deepak soni
April 4, 2012
networking

I want to know about securites in OSI layers
AKHILESH RANJAN
April 7, 2012
computer communication networks

what is messging
sadikh
April 16, 2012
addressing OSI

Give examples of addresses at different layers of the OSI reference model including link layer and transport layer.
Arif Hussain
April 19, 2012
OSI model

who has given difination of OSI model,its very nice, but the defination of presentation layer not so good its require to check once time its my view.
pranali pawar
April 24, 2012
networking

this information give lots of knowldge about osi layer.now i got idea about osi layer nd hw its work.thx
anas
May 16, 2012
computer

its awesome but i think so if students of intermediate are going on with this type of work then its abig advent in youth of our country and we all were levllilzed
Raju Dhamale
May 25, 2012
Network

What is main advantage of OSI Model?
Shakil ahamad
June 7, 2012
osi model

what is osi and how it work which devices work on each layer
MOhammad
June 8, 2012
networker (CCNA) Trained

Thanks for helping me ,i really need that kind of stuff so thankx alot.Bye
pawan kumar
June 21, 2012
mces + ccna Qucation

please some Quction and Answare ni Mces + ccna
bharath
June 21, 2012
osi models

very nice
naveen
July 8, 2012
osi model networking qustion

no comments ........,
kamran
July 11, 2012
telecom

to help full
Nasser
July 29, 2012
apply osi on messenger between the layers

Hello, am new to this field, i have started lesson in IT this week and at the end of the lesson the lecturer ask me to APPLY OSI ON MESSENGER BETWEEN THE LAYER. Can u plz help me?
suraj kumar
August 19, 2012
osi model

THE OSI MODEL (OPEN SOURCE INTERFACE MODEL)IS A PRODUCT OF THE OPEN SYSTEM INTERCONNECTION EFFORD AT THE INTERNATIONAL ORGANISATION FOR STANDARDIZATION. IT IS USE TO DESCRIBE NETWORK AND APPLICATION DATA.
vikram
August 23, 2012
osi layer

you have a done ?
Dickbutt
August 24, 2012
.

I Like Turtles.
Ferdoush sk
September 13, 2012
ferdoush

osi layer
wahab
September 19, 2012
network

i m intrust the network.....
veeresh
October 1, 2012
tcp/ip model

what are major application of tcp\ip model
Musadiq
October 1, 2012
student

sir you describe very well thanks
VIPIN SINGH
October 29, 2012
CCNA

DETAILS OF OSI LAYERS PROTOCALL
miwanda richard
November 15, 2012
computer application

internet is some how the best
brhanu getachew
November 18, 2012
what is osi model?

i want to gain the info about data link layer use device
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
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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