Oh, I would, you know, I say it stands for open systems interconnection.
It is a conceptual framework used to describe the functions of a networking system.
Yes, I mean, it characterises computing functions into a universal set of rules and requirements in
order to support interoperability between different products and software.
And obviously, a reference model, the communication between a computing system and split into seven
different abstractions, then the physical datalink network in their transport layer, session, presentation
and application.
So let's have a look here, as you can see.
So here are then seven layers we have.
We have the application there, the end user and they are actually could be FTB by us as such.
Then we have that presentation there, the syntax there, which is SLAC and as such, a map app to be.
And you can see that the presentation, like the FTB, exists in the presentation and application.
We have the session there for sink and seemed to board empty eye sockets when, when, so and so on
transport layer.
So here is responsible for the TCB and Whitby exists in the transport into kitchens.
We have the network, the packets, IBC and VIP IPsec GMP.
We have the datalink that frames Ethernet P.P.P or in Table B. We have switch and bridge, so you can
see it is inside the datalink.
We have the physical finally, which is the physical structure, the court's five US wireless hub speakers
and so on.
OK.
By the way, the doctors will be here inside this layer or categorised inside this lab.
Now, let's start with the physical damage.
Now this is the lowest layer of the US model, which is concerned with electrically or optically transmitting
role and structure database across the network from the physical layer of the sanding device to the
physical layer of the receiving device.
OK, so from singing to receiving, it can include specifications such as voltage bin layout cabling
and radio frequencies, and the physical layer one might find physical resources such as it workups,
cabling repeaters, network adapters automatic now for the datalink now.
At the data lab, directly connected knots are used to perform not to note that transfer where it is
backwards into print so that it can now also correct that may be that may have occurred at the physical
level, and the datalink layer encompasses two up layers of its own.
So the first media access control, which is the Mac, provides flow control and multiplexing for device
transmission over into the second, which is the NLC.
Biological control provides flow and it'll control over the physical medium, as well as identifies
the protocols for the little plan that Blair is responsible for receiving frames from the datalink layer
and delivering them to their intended destinations among based on the addresses contained inside the
frame.
Then, interlayer finds this nation by using logical addresses such as IP, the Internet Protocol and
if their daughters are crucial component used to quite literally around information where it needs to
go between networks.
And by the way, they're wrong to categorize in this clip or in this in the transport that it makes
the delivery and error checking of data because it regulates the size sequencing and ultimately the
transfer of data between systems and hosts.
One of the most common examples of the transport layer is the TCB or the transmitter to ensure the transmission
control protocol or the UDP.
So this would be and would be are here.
The session live session now controls the conversations between different computers, obsession or connection
between machines is set up, made and determined.
Terminated at layer five, which is a decision that so essential services also include authentication
and reconnections.
Well, the presentation now.
The layout, the presentation now formats or translate data for application layer based on the syntax
or semantics that the application access.
So because of this at times also called the syntax down, this snare can also handle the encryption
and decryption required by the application.
And finally, we have the application now, which is a display on both the end user and the application
now interact directly with the software application.
This lab sees network services provided to end user applications such as what browser or Office 365
365 application that identifies communication partners, resource availability and.