If youโre an IT professional, knowing the OSI Model is a must in 2023
Knowing the OSI Model is no longer only for networking folks. In todayโs interconnected world, itโs becoming essential knowledge for everyone in the tech industry.
๐ง๐ต๐ฒ ๐ข๐ฝ๐ฒ๐ป ๐ฆ๐๐๐๐ฒ๐บ๐ ๐๐ป๐๐ฒ๐ฟ๐ฐ๐ผ๐ป๐ป๐ฒ๐ฐ๐๐ถ๐ผ๐ป (๐ข๐ฆ๐) model is a conceptual framework for understanding how computers communicate with each other.
letโs think of the OSI model as a postal system for the internet.
In this system, we have seven steps (or layers) that information takes from one computer to another.
Each layer has a specific job and these jobs need to be done in a certain order, like when you send a letter through the post office.
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๐ฃ๐ต๐๐๐ถ๐ฐ๐ฎ๐น ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ญ)
: Like a mail truck, this layer is responsible for the actual delivery of data. In a computer, itโs the physical parts like the cables and wires 
that carry the data from one computer to another. -
๐๐ฎ๐๐ฎ ๐๐ถ๐ป๐ธ ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ฎ)
: This layer is like the sorting process at the post office. It prepares the data for transport on the physical layer by packaging it up 
and adding a delivery address 
. -
๐ก๐ฒ๐๐๐ผ๐ฟ๐ธ ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ฏ)
: This is like the system the post office uses to determine the best route for the letter. This layer finds the best path 
for the data to get to its destination. -
๐ง๐ฟ๐ฎ๐ป๐๐ฝ๐ผ๐ฟ๐ ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ฐ)
: Think of it as a security check. It ensures that the data arrives safely without any errors, like making sure that your letter isnโt damaged when it arrives. -
๐ฆ๐ฒ๐๐๐ถ๐ผ๐ป ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ฑ)
: This layer is like making sure the mail is delivered to the correct mailbox 
. It establishes, maintains, and ends communication with the receiving device. -
๐ฃ๐ฟ๐ฒ๐๐ฒ๐ป๐๐ฎ๐๐ถ๐ผ๐ป ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ฒ)
: This layer is like the person who opens the letter and translates it into a language you understand. It changes the data into a format that the receiving computer can understand. -
๐๐ฝ๐ฝ๐น๐ถ๐ฐ๐ฎ๐๐ถ๐ผ๐ป ๐๐ฎ๐๐ฒ๐ฟ (๐๐ฎ๐๐ฒ๐ฟ ๐ณ)
: This is like the contents of the letter itself - the information you want to communicate. This is the data that the user interacts with, like your email 
or web browser 
.
๐ง๐๐ฃ/๐๐ฃ is another model used for networking and it stands for โTransmission Control Protocol/Internet Protocol.โ
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๐ก๐ฒ๐๐๐ผ๐ฟ๐ธ ๐๐ป๐๐ฒ๐ฟ๐ณ๐ฎ๐ฐ๐ฒ (๐๐ฎ๐๐ฒ๐ฟ ๐ญ)
: This is a combination of OSIโs Physical and Data Link layers. -
๐๐ป๐๐ฒ๐ฟ๐ป๐ฒ๐ (๐๐ฎ๐๐ฒ๐ฟ ๐ฎ)
: This is similar to OSIโs Network layer. -
๐ง๐ฟ๐ฎ๐ป๐๐ฝ๐ผ๐ฟ๐ (๐๐ฎ๐๐ฒ๐ฟ ๐ฏ)
: This combines the functions of OSIโs Transport and Session layers. -
๐๐ฝ๐ฝ๐น๐ถ๐ฐ๐ฎ๐๐ถ๐ผ๐ป (๐๐ฎ๐๐ฒ๐ฟ ๐ฐ)
: This layer combines the OSIโs Presentation and Application layers.
Credits: 