Well, hello again, and we are going to see now that second layer we have in the second layer the data
leak, and we have some layers in this layer.
We have to some layer that is called Mac.
And as the.
This is this Lear is more smart than physical and less smarter than network, it is.
It works with the physical, physical address and error detection.
And see our Z Acknowledgments backwards frame.
Heather and Taylor.
Bridget, what is it?
Well, in this layer, it takes the message from physical than bytes, and it will end in the beginning
of the the the message of the bytes and the end of the bytes, another message and other messages so
it can be transferred to the network.
So the network will understand.
The following concept, by the way, and this in this layer, the the main machines that works in it,
remember very well bridges or switches.
But remember, this word is.
And unconsidered is like we said before, Frank.
No.
We have in the third layer, as we said, the network.
How does it how does the network work when we receive the message from the data link?
The message that it have the main message from physical plus the heather plus the left part.
It gives the networks the the beginning and least it gives it the direction.
Where does the message should go?
Is it going on this road or on this road or it's going to be on this way or we are going to see if it's
us?
It gives it the direction and it means and to deliver a geological address and fragmentation or seek
within.
For me, you wrote you.
And you is major other units and.
It is in this part that when we receive that, this frame would transfer it to a logical address and
we call it fragmentation.
Or a sequence, but we may would call it a.
A bucket.
The message that we get from network to transport, which is the second, the fourth layer or the second
layer after, and it's what we call the baggage and the mainly mainly in this part.
Rotors, rotors are the machines that works in this layer.
And we have next the fourth layer, which is transport.
Transport.
It receives the budget and transferred to another mission, which is going to add another and another
the last part, and we are going to call it segment fragment, and we have a fragmentation or sequencing
of data, reliable delivery, error recovery, flow control and multiplexing.
And we have airports.
What is multiplexing?
We are going to see it in the course of advancing the Cisco packet tracer.
The of part.
And now which type of machines or which type of.
Which type of machines that works on this layer we have here ports, what our ports boards are, the
entrance or it can do also the exit.
In a in a in or alter or maybe a switch or maybe a hub is the place where we put the wire or the cable,
and mainly it is going to be in our course and our G 45 cable.
We have, again, transparent data service and some firewalls.
There is there is some firewall that works that work in this layer just to have local control.
Yes, indeed we have that.
And.
See you for the next three years.