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.