Give me 2 mins and I'll teach you how OSI model works:

OSI model is a 7-layer conceptual framework.

It represents how data moves through a network.

And helps engineers understand, design, and debug how systems communicate over networks.

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7 Application Layer

↳ Handles how apps like browsers or email clients send and receive data over the network.

↳ Uses protocols such as HTTP and SMTP to deliver data in a format that apps can show to the user.

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6 Presentation Layer

↳ Prepares data for the application layer by making it readable and efficient.

↳ Translates, encrypts, and compresses data so systems can communicate securely and quickly.

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5 Session Layer

↳ Controls the start and end of communication between systems starts and ends.

↳ Keeps the session open for data transfer, adds checkpoints to resume after interruptions, closes it to save resources.

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4 Transport Layer

↳ Handles reliable data delivery between systems.

↳ Breaks data into segments, controls speed and errors, and reassembles using protocols like TCP and UDP.

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3 Network Layer

↳ Moves data between different networks by breaking it into packets and reassembling them at the destination.

↳ Finds the best route for data to travel using protocols like IP, ICMP, and IPsec.

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2 Data Link Layer

↳ Moves data between devices on the same network.

↳ Packages bits into frames and uses MAC addresses to deliver them to the right local device.

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1 Physical Layer

↳ Handles the actual hardware that moves data, like cables, switches, and signals.

↳ Converts data into bits and ensures both devices agree on how those signals are sent and read.

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OSI model ensures data moves in a clear, structured, and reliable way.

An acronym to remember the OSI model is:

↳ Please Do Not Throw Sausage Pizza Away.

What else would you add?

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