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2. OSI MODEL

3. OSI MODEL
• OSI stands for Open Systems Interconnection.
• OSI (Open Systems Interconnection) has been developed by International
Organization for Standardization (ISO).
• It is a 7 layer architecture.
• All these seven layers work together to transmit the data from one system to
another. Each layer have different functions to work.

4. LAYERS OF OSI MODEL

5. APPLICATION LAYER

6. APPLICATION LAYER
• It isTheTopmost Layer of OSI model
• It is very closest to the user.
• users interact directly with applications that work at layer 7
• Some examples of appliactions are:
Google Chrome, Firefox, Safari, Skype, Outlook, Office

7. PRESENTATION LAYER

8. PRESENTATION LAYER
• Presentation layer is also called the Translation layer.
• The data from the application layer is translated according to the format to
transmit over the network
• The functions of the presentation layer are :
 Translation
 Encryption
 Compression

9. SESSION LAYER

10. SESSION LAYER
• Session layer is responsible for the security and authentication
• This Layers also ensure setup, coordination (how long should a system wait
for a response) and termination between the applications at each end of the
session
• The functions of the session layer are :
 Session establishment, maintenance and termination
 Synchronization
 Dialog Controller

11. Transport Layer

12. Transport Layer
• This layer takes data from the above layer and breaks it into smaller units
called Segments and then gives it to the Network layer for transmission.
• It is responsible for the End to End delivery of the complete message
• The functions of the transport layer are
 Segmentation and Reassembly
 Service Point Addressing

13. NETWORK LAYER

14. NETWORK LAYER
• Network layer works for the transmission of data from one host to the other
located in different networks.
• ItTransmit the data in the form of packets.
• It selects the shortest path to transmit data.
• The functions of the Network layer are :
 Routing
 Logical Addressing

15. DATA LINK LAYER

16. DATA LINK LAYER
• The Data Link Layer provides node-to-node data transfer between two directly
connected nodes
• It also handles error correction from the physical layer.
• It transmit the data as the frames
• The functions of the data Link layer are :
 Framing
 Physical addressing
 Error control
 Flow Control
 Access control

17. PHYSICAL LAYER

18. PHYSICAL LAYER
• It is the lowest layer of OSI Model
• It is responsible for the actual physical connection between the devices
• This layer contains the data in the form of bits
• The functions of the physical layer are :
 Bit synchronization
 Bit rate control
 Physical topologies
 Transmission mode

19. Functioning of OSI Model

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