In the previous post we learned about the OSI reference model and its 7 layers, but have you understood these layers? If yes, then great. If not, then don’t worry, this post is for you. Here we will learn about the OSI reference model with a simple example so that you can understand how the OSI model works in real life.
OSI Model Analogy:
Application Layer – Source Host
After riding your new bicycle a few times in Bangalore, you decide that you want to give it to a friend who lives in DADAR, Mumbai.
Presentation Layer – Source Host
Make sure you have the proper directions to disassemble and reassemble the bicycle.
Session Layer – Source Host
Call your friend and make sure you have his correct address.
Transport Layer – Source Host
Disassemble the bicycle and put different pieces in different boxes. The boxes are labeled “1 of 3”, “2 of 3”, and “3 of 3”.
Network Layer – Source Host
Put your friend’s complete mailing address (and yours) on each box. Since the packages are too big for your mailbox (and since you don’t have enough stamps) you determine that you need to go to the post office.
Data Link Layer – Source Host
Bangalore post office takes possession of the boxes.
Physical Layer – Media
The boxes are flown from Bangalore to Mumbai.
Data Link Layer – Destination
Dadar post office receives your boxes.
Network Layer – Destination
Upon examining the destination address, Dadar post office determines that your boxes should be delivered to your written home address.
Transport Layer – Destination
Your friend calls you and tells you he got all 3 boxes and he is having another friend named
BOB reassembles the bicycle.
Session Layer – Destination
Your friend hangs up because he is done talking to you.
Presentation Layer – Destination
BOB is finished and “presents” the bicycle to your friend. Another way to say it is that your friend is finally getting him a “present”.
Application Layer – Destination
Your friend enjoys riding his new bicycle in Dadar.
Data Flow Through a Network
