In this video we're going to look at the oversized model with an emphasis on how devices communicate
the Open Systems Interconnection model or design model is a critical building block for your understanding
of networking.
You'll often hear network engineers discuss issues but saying that there's a problem at layer one or
we have a network fault at least three or this is a layer 4 issue or we have a Layer 7 issue to understand
what that means.
You need to have a good understanding of the OS on model the OS on model is important for troubleshooting
and understanding networks and network protocols we're going to firstly look at the reasons for using
the OS eye model what advantages are there to using this model in networking today.
We'll then look at the layers of the OS eye model and that's where these terms layer four or layer five
or layer seven come into play.
I'm going to show you how traffic flows between hosts with specific reference to the OS I model.
And lastly I'm going to show you how the OS model is used in the real world by sniffing traffic using
a free application called why a shock.
Why shock is a sniffing application that allows you to see traffic on the network.
In this example I'm going to open a web browser to a server on the Internet and we'll capture the traffic
and see what it looks like.
The OSA model is often used to explain communication between devices in a network.
It makes it easier for network engineers to discuss specific issues with devices such as routers or
switches when host a sends traffic to host B.
How does that communication actually take place and at which a layer of the OS model du devices such
as switches or routers operate.
There are multiple advantages to using the OS model.
And let's look at a few of those and then I'll explain the layers in a lot more detail.