It’s a logical model which is allowing us to think about where the problem may be. If we don’t know about the problem it will give us the idea where to start.
(It helps us to identify the problem and issue is related to which layer and from where to start the troubleshooting etc.)
Application ----- Where users are interacting with the information (like IE, Chrome etc.., ) If any issues with applications like IE or Chrome is not working it will be called as application layer problem.
Presentation ----- User interact with Application Layer it will sends the information to Presentation Layer it will convert it to system level language (conversion and Compression), OS will work at this layer. If any issues with drivers or OS (corrupted) issues it will be called as presentation layer problem.
Session ----- It will deals with the communication between two computers, it will create the session between source computers to destination computer.
Transport ---- It will decide how much communication we can able to communicate with the client and how much information client can communicate with us. This layer is responsible for delivering the packets at the destination.
Network ---- This is the layer were router will work based on IP address. It will decide the route to (Best path) reach the destination.
Data Link ---- Switch will work at this layer based on MAC Address, Layer 2 switching LLC and MAC layer will work at this layer.
Physical ----- All the physical stuffs which connects to the computer to network. Like cables, patch card, etc… There is no configuration at this layer.
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