What is OSI Model?

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OSI stands for Open Systems Interconnection and is a conceptual framework for how applications communicate over a network.

There are seven layers within the model and the depiction of the layers is used to help users identify what is happening within a networking system.

The OSI model layers are typically described from the top layer down. The layers are described as Application, Presentation, Session, Transport, Network, Data Link, and Physical.

These layers are provided by a mixture of network card drivers, operating systems, applications, and networking hardware that facilitate the transmission of signals over Ethernet, Fiber Optic, Wi-Fi, or other wireless protocols.

We’ll describe the layers from the top down as the top layer is the Application layer or layer 7. This is the layer that most users interact with and will recognize.

The Application layer provides network services to the end user.

These services are protocols that work with the data the client is using. One of these protocols may be HTTP that is used with web browsers such as Google Chrome, Firefox, and Internet Explorer.
Other examples of applications that use this layer are Office, Outlook, and Skype.

All of those interactive applications provide a set of services that allow the application layer to supply data to and receive data from the Presentation layer.

The Presentation layer, or layer 6, performs the uncomplicated task of syntax processing or converting data from one format to another.

For example, say you are ordering something from an online store.

These transactions are typically handled in a secure transmission which means that the data passing between the “store” or the Website Application will transmit encrypted data to the Presentation layer that will need to be decrypted and processed.

This layer handles translating the data from the top layer, which is presented in the application format, to network format and vice versa.

After the Presentation layer processes the data from one format to another, the information is then passed to the Session layer or the Application layer depending on whether the data is transmitting or receiving.

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#RealPars

[davidmvenegas]

An acronymn I use to remember the OSI model:

Probably (physical)
Didn't (data link)
Need (network)
Those (transport)
Stupid (session)
Packets (presentation)
Anyway (application)

[eddyeffy]

These videos make sense because majority of lecturers try to be ridiculous in how they treat these topics so we have more people confused about these concepts and these gives the videos relevance.

[aflyingtoaster]

what my teacher couldn't explain in 2 weeks, you explained it in a matter of minutes, thanks a lot !!!

[Shikogo]

I created personal study notes for myself out of this video and it took me nearly an hour. The information density in this video is crazy, in a good way. Extremely helpful, thank you very much!

[MrHAMMUDE]

My god, our teacher had nearly the entire class lost in this topic for 4 straight days, yet you simplified it and made it easy to understand in 8 minutes. Bless you.
He just kept on going back and forth between steps and mixing in other shit the entire time that we just felt lost. He would often bring something that should be taught next week in today's lecture that made no sense.
Thank you.

EDIT: You got a new sub!

[andrezaemon]

This is really a good video for someone like me who would like an introduction on the subject. Short and visual. Thanks a lot!!

[Franhausen]

8:22 is what it took you to explain this concept to me, while my instructor has been going over this with us for three days.
Thank you.

[jermaineomorogbe]

I was left confused when taught this concept in class. This video made a very complex subject straight forward. Thank you!

[noonpe]

The most simple and educative video I have seen so far.

Thanks a lot

[paulsunday]

Thank God I discovered this channel. This is the best teaching method or pattern so far. What I couldn't understand in two weeks, I got it here clearly. You got a new follower today. Thank you ❤

[sant]

The tip is that http covers all three upper layers - Application, presentation and session and the borders of the layers are quite unformal.

[skullomanjaro]

My schools explanation for this was absolutely horrible not to mention breezed by like it was a easy 2+2=4 concept. This video is amazin for those who need to visualize the information. I now graduated with my Bachelors not fully understanding this which is not good obviously. But this video made 1000% sense and i now understand it fully with 5 pages of notes. Recomended to anyone who is going through classic college courses, excellerated courses, or already done with school. Subbed and Liked

[deepeshshrestha]

I watched it once loved it.
And today I searched whole YouTube history in browser to watch again damn the quality.🐯.

[danbacila]

This is a great video for understanding the OSI Model! Thank you!

[kabooby]

I like the dry and straight forward manner of presentation, good video.

[jacquesbarro]

Thank you very much for informative video. You made it easy for someone like me in his mid 50’s with no prior computer knowledge. Thanks again

[vcwocqv]

Excellent! A perfectly simplified depiction. Thank you!

[erickmutonyi]

Am grateful for this video. I look foward for it's continuation.

[hawaslianas]

Thank you so much. I wish my teachers were as good, simple, and helpful.

[its_roggy]

Got 10 minutes before my exam, and this video helped me alot. Thanks!!!