The document summarizes the 7 layers of the OSI model: Application, Presentation, Session, Transport, Network, Data Link, and Physical. Each layer has specific responsibilities for protocol interactions, data exchange, error control, addressing, and connection management between networked devices. An acronym is also provided to help remember the layers: All People Seems To Need Data Progress.

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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. * 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
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4. * All – Application Layer
* People – Presentation Layer
* Seems – Session Layer
* To – Transport Layer
* Need – Network Layer
* Data – Data Link Layer
* Progress – Presentation Layer
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5. * 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
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6. * It is responsible for Data Exchange between 2 devices
* It manages data encryption and decryption
* Translation and Compression
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7. * It is responsible for establishment of
connections.
* Management, Synchronization, Termination
between two nodes
* Dialog Control
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8. * It ensures that the entire massage reached to
the receiver or not
* Service point addressing
* Segmentation & Reassembling
* Connection Control
* Flow Control
* Error Control
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9. • It is responsible for logical addressing
• Routing
• Handling Congestion Issues
• Internetworking
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10. * It handle Data Transfer
* Framing
* Physical Addressing
* Access Control
* Flow Control
* Error Control
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11. * It is responsible for Establishment or
Termination of the connection between two
nodes.
* Media Characteristics
* Data Encoding
* Transmission Mode
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