Hi. My name is John Aid, and I'm going to be your CCN instructor for the week. For this course, we are going to break this class down according to the S I Layer model. For those a few who are not familiar with that with Tyler model, I'll be covering it shortly on the board. The way this class will be structured,
each layer of the outside layer model will be covered in depth with all the protocols that pertain to it.
There are some ancillary topics that do not fall exactly under any layer that are going to be covered at the end of the class or towards the end of the class.
So how about we get started?
In the beginning, when the Internet was new and people were just creating networks
let's suppose some people in America got together and created a network according to the rules and designs of what they thought was plausible.
And then at some point, somebody in another country say Japan came up with the same idea of creating a network,
and they did it according to their own rules and according to what they thought was possible
not in the future. If there came a time where the American network needed to talk to the Japanese network, the chances of the two networks inter communicating with each other are slim to none.
Hence, a governing body came out with a set of rules that apply globally that applied throughout the world. Now, this set of rules dictates how networks should be built and operated by everybody, which would
make it easier for in operability between networks. Now, this set of rules is called the open system Interconnect model or the S I lead model. So let's write down the layers included in the S I model open systems interconnect model or
Now, the S I model is made up of seven layers. Layer one is your physical Lear to is your data link layer Layer three is your network. Lear Lear four is your transport. Lear five
is your session six is your presentation. And seven
is your application there.
The wear structure of this crisis
that I follow a layered approach.
So we're going to start with their one, and then we're gonna cover everything pertaining to live one. Then we're gonna go to later, too, and cover any everything pretending to live two and so on and so forth. Now, as a network engineer with the CCN A, your life will revolve around.
off course. You don't want to work in their one because you don't want to be the cable guy. After you get your CCNET,
do a little bit of application layer stuff. Those ancillary topics that I talked about at the end of the class.
There's five in there. Six, unless you are a programmer, has nothing to do with you.