the osi model
DESCRIPTION
TRANSCRIPT
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What is an OSI?
•OSI stands for Open System Interconnection
•This was developed by the ISO (International Organization for Standardization) in the year 1977.
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What is the Main Objective of the OSI
Model?
–To standardize Networking to make sure that everyone was connected through a common network standard.
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7 Layers
Layer Function7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data link
1 Physical
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To Remember the 7 Layer
Layer Function
Note
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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PHYSICAL
•This is the Layer that physically connect the networks together.
•Hardware•Medium of Signals
–Such as Cables, satellite, etc.
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Some Physical Layer Devices
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Split the data into packets This layer makes possible divide a way to exchange data
or a common local media
DATA LINK
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Send packets to address Supplies the means to
exchange pieces of data over the network between identified and devices.
NETWORK
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Ensures that packets arrive, and error free and are in correct order
TRANSPORT
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Established and coordinates connection between computers
This layer establishes, manages, and terminates connection also known as session between 2 network address
SESSION
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Allows transfer of files between different formats. Encryption is one of the services in this layer.
Encryption is the translation of data into a secret code. Encryption is the most effective way for data security. To read an encrypted file you must have a password or a secret key.
PRESENTATION
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This is the layer where people do their work , such as sending e-mail or requesting to transfer a file across the network
E-mail, files requests, file transfers, etc.
APPLICATION