What is an OSI?
• OSI stands for Open System
Interconnection
• This was developed by the
ISO (International
Organization f...
What is the Main Objective
of the OSI Model?
–To standardize Networking to
make sure that everyone was
connected through a...
7 Layers
Layer Function
7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data link
1 Physical
To Remember the 7
Layer
Layer Functio
n
Note
7 Application All
6 Presentation People
5 Session Seem
4 Transport To
3 Netwo...
PHYSICAL
• This is the Layer that
physically connect the
networks together.
• Hardware
• Medium of Signals
–Such as Cables...
Some Physical Layer
Devices
 Split the data into packets
 This layer makes possible divide a
way to exchange data or a
common local media
DATA LINK
 Send packets to address
 Supplies the means to exchange
pieces of data over the network
between identified and devices....
 Ensures that packets arrive,
and error free and are in
correct order
TRANSPORT
 Established and coordinates connection
between computers
 This layer establishes, manages, and
terminates connection al...
 Allows transfer of files between different
formats. Encryption is one of the services
in this layer.
 Encryption is the...
 This is the layer where people do their work
, such as sending e-mail or requesting to
transfer a file across the networ...
The OSI Model
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The OSI Model

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  • The OSI Model

    1. 1. What is an OSI? • OSI stands for Open System Interconnection • This was developed by the ISO (International Organization for Standardization) in the year 1977.
    2. 2. What is the Main Objective of the OSI Model? –To standardize Networking to make sure that everyone was connected through a common network standard.
    3. 3. 7 Layers Layer Function 7 Application 6 Presentation 5 Session 4 Transport 3 Network 2 Data link 1 Physical
    4. 4. To Remember the 7 Layer Layer Functio n Note 7 Application All 6 Presentation People 5 Session Seem 4 Transport To 3 Network Need 2 Data link Data 1 Physical Processing
    5. 5. PHYSICAL • This is the Layer that physically connect the networks together. • Hardware • Medium of Signals –Such as Cables, satellite, etc.
    6. 6. Some Physical Layer Devices
    7. 7.  Split the data into packets  This layer makes possible divide a way to exchange data or a common local media DATA LINK
    8. 8.  Send packets to address  Supplies the means to exchange pieces of data over the network between identified and devices. NETWORK
    9. 9.  Ensures that packets arrive, and error free and are in correct order TRANSPORT
    10. 10.  Established and coordinates connection between computers  This layer establishes, manages, and terminates connection also known as session between 2 network address SESSION
    11. 11.  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
    12. 12.  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
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