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1. OSI Model

2. OSI Model
• Open System Interconnection
• This divides the networks into the 7 layers
• The protocol perform services to unique layers
• Protocol interacts with protocol in Layer Directly
above and below
• Protocol : it is a set of instruction to perform a
function or group of function that is written by a
programmer

3. OSI 7 layers

4. How to Memories 7 Layers
• Everything in the world have a way to learn
and understand and same he for the OSI layer
“ All People Seems To Need Data Progress”
Just took the first alphabet in the word in given
sentence

5. All – Application Layer
People – Presentation Layer
Seems – Session Layer
To – Transport Layer
Need – Network Layer
Data – Data Link Layer
Progress – Presentation Layer

6. Application Layer
Application Layer is responsible using network
application like HTTP, FTM, Directory Services.
Application program interface (API) – set of
routines that make up part of a software
application

7. Presentation Layer
• It is responsible for Data Exchange between 2
devices
• It manages data encryption and decryption
• Translation and Compression

8. Session Layer
• It is responsible for establishment of
connections.
• Management, Synchronization, Termination
between two nodes
• Dialog Control

9. Transport Layer
• It ensures that the entire massage reached to
the receiver or not
• Service point addressing
• Segmentation & Reassembling
• Connection Control
• Flow Control
• Error Control

10. Network Layer
• It is responsible for logical addressing
• Routing
• Handling Congestion Issues
• Internetworking

11. Data Link Layer
• It handle Data Transfer
• Framing
• Physical Addressing
• Access Control
• Flow Control
• Error Control

12. Physical Layer
• It is responsible for Establishment or
Termination of the connection between two
nodes.
• Media Characteristics
• Data Encoding
• Transmission Mode