What is OSI Model?
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- เผยแพร่เมื่อ 16 พ.ค. 2024
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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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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.
00⁰000⁰
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)
Thank you for sharing, David!
Thank you
Haha this is epic!
what my teacher couldn't explain in 2 weeks , you explained it in a matter of minutes , thanks a lot !!!
That's a great compliment then! Thanks a lot for sharing that with us - happy learning!
😅😅😅😅😅😅….
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!
That's amazing to hear! Thank you very much for sharing
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!
Glad it was helpful! Thank you for sharing and always feel free to leave us any questions that might come up along the way.
This is really a good video for someone like me who would like an introduction on the subject. Short and visual. Thanks a lot!!
Glad you enjoyed it!
I watch this video before every CS exam 😂😂
Great! Hope they are helpful, Vikram :)!
I was left confused when taught this concept in class. This video made a very complex subject straight forward. Thank you!
That's an amazing compliment! Happy to help!
The most simple and educative video I have seen so far.
Thanks a lot
Glad it was helpful! Thank you for sharing, Ali!
This is a great video for understanding the OSI Model! Thank you!
Amazing to hear that! Thanks for sharing.
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.
Thanks a million! That's an amazing compliment, we truly appreciate that.
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 ❤
Glad to hear that! Thank you very much for sharing, and happy learning!
Excellent! A perfectly simplified depiction. Thank you!
Glad you enjoyed it!
clear concise explanation. very helpful. thank you!
Great to hear that, David!
Thank you so much. I wish my teachers were as good, simple, and helpful.
That's an amazing compliment, Anas! Thanks a million.
Were*
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
That's amazing to hear, Jacques! Glad to hear that and happy learning!
I like the dry and straight forward manner of presentation, good video.
Thank you!
Your channel is one of my best tech channels in youtube.
Keep on fascinating us.
Great to hear, Asaad! Thank you.
Thank You so much for such a wonderful explanation!!!
You are very welcome!
Thanks Realpars , congrats on 700k subs
Thanks a lot!
Thanks a lot for this video! It was really clear and helpful!
Glad to hear that!
Awesome video! This was a huge help for understanding the OSI model.
Glad to hear it!
This channel is pure gold. Thanks a lot.
Happy to hear that!
Best explanation I've seen so far! Thanks
Great to hear that, Adam! Thanks for sharing!
This is the best Video I have seen so far on the explanation of the OSI and I have seen several of them.
That's great to hear! Thank you very much for sharing
Well done, I really like this channel. Help me a lot
Thank you! :)
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0
Am grateful for this video. I look foward for it's continuation.
I'm glad you like it!
Got 10 minutes before my exam, and this video helped me alot. Thanks!!!
Glad it helped! Hope your exam went well!
@@realpars Hey! Too bad they didn't bring it, but still this video was still helpful. Thanks again!
Thank you for putting this together!
Our pleasure!
Thanks so much for this, I was able to follow through
Glad it helped! Always feel free to leave us any questions you might have.
wow, been reading about this, this literally cleared up any confusion I had. thank you for this!
That's amazing to hear, Dan! Glad it was helpful!
This is so amazing. Thank you so much!
You're so welcome!
I like this channel Very much. Well classified graphical representation make it easy to understand . A novice learner like me can gain some knowledges from your lessons. Thank you 💕💕💕💕.
Thank you very much!
Very well explained
Glad it was helpful! You're very welcome!
Another great video. Keep them coming!
Happy to hear that you are finding our videos useful. Happy learning!
Simply simplified..........
Thank you.
You're welcome!
It really helps me a lot. Loved it! 😍
Awesome! Thank you!
And i do have a question, protocol like Modbus TCP, works in the application layer right ? the physical and data link layer is the ETHERNET, the Network layer where reside the IP address, the transport layer is TCP/IP, i don"t know much about the session and the presentation layer, and the application is where we found the Read/Write coil and all the functions in Modbus, is that right ?
Why didn't I find this video earlier... this channel helps me a lot... Thank you :)
Glad to hear that! Happy learning, and always feel free to reach out if you have any other questions.
I watched it once loved it.
And today I searched whole TH-cam history in browser to watch again damn the quality.🐯.
Thanks for your support, Deepesh!
This was probably the best video on the OSI model
Thanks a million!
It is very clear and perfect explanation. Thank you
Glad it was helpful!
Thank you so much!
Glad it helped!
really excellent... pictorial representation enables me, easy to understand
Great to hear that!
Thank you
Its so helpful.
This is great review simple and short, Thank you!
Thanks for the positive feedback!
You have brighten my brain!! I always hated this subject but you made a piece of 🎂 😍
That's a great compliment, Safiya! Thank you!
excellent explanation !! thank you so much, keep doing such great things !
You're very welcome! Happy to hear that our course videos are helpful to you!
awesome! your explanation is best in youtube!! thank you so much 🤭
Great to hear! Thanks a lot!
Best osi model explanation. 🔥
Glad you liked it
This was done very well. Thank you.
Glad you enjoyed it!
I watched it twice, great job instructing!
Thanks a lot, Gina!
Absolutely Brilliant, Thanks a lot Sir..
Thanks a lot, Muhammad!
This is a very good video, thank you!
You also kinda sound like kahnacademy lol
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
Thank you very much for sharing that! That's amazing to read.
absolute chad who made this video. You man got me through the finals
Great to hear that, Tomas! Great job!
THANK YOU, WELL EXPLAINED
Amazing, Matsietsi!
there is no better ways how things inter connect. thanks a lots ,really really a very good job.
You are very welcome!
Best Titorial for OSI Model
Thank you!
thank u so much for your explication it's simple and clear
You're very welcome!
thank you. this is very helpful.
You're welcome!
Amazing content! Thank you.
Happy to hear that, Zakary!
Very nice and clear explanation. Thanks for making this video.
Glad it was helpful! Our pleasure, Kasper!
Good Video..This video was Presented by my Teacher in class...Thanks for this i have learned how the osi or layers works..PEII Jaro EIT Student
Thank you! Nice to hear that your teacher is using our videos in class! Happy learning
This video gave me a great understanding on ISO
Glad to hear that, Joseph!
Guys thanks a lot I've collected a lot of information that
i need in a simple and short way thanks again
That is great to hear, Mohamed! Keep up the good work!
Thank you again RealPars !!! Great Video, i was just learning OSI model and here you post this video at the same time :)
It would be very helpful though if you could please make a video to explain for exemple a Modbus TCP communication (Or whichever protocol you want) and see each layer what it contains !!
Thanks for sharing your positive feedback with us Amrouche! I will pass your topic request through to our creator team. Thanks a lot! Happy learning.
Congratulations you made me to understand more 🙏
Glad to hear that!
brief and useful. thank you
Great to hear!
Great visual guide to translate something so complex (as we thought). Thank you for this very informative video!
Question: Why do they start at the top from the Application side of things rather than start at the Physical layer and work your way up?
Thanks again
Because we users start interacting from the application layer.
if we receive something it starts at the physical layer and when we send something it starts at the application layer
Because data to send is created at the application layer, sent down to lower layers then at destination the opposite happens. When receiving data it comes from the lower layers up to the application layer from there to user application. Lower layers are abstracted, when you're coding an application you only interact with the application layer.
So maybe they start at 7:
- because is the one you code in when writing software
- because is the one closer to where data is produced or consumed by software
- because it's easier to understand the needed service offered by network protocol to software; sub layers solve not direct software needs, but solve caveauts that apper when trying networking. Lower levels are needed to make the service magically work at the application level, with conundrum arising when trying to network (data loss, packet loss, integrity, retransmission, security, routing, interference) solved magically by "somebody else" at inferior levels, and not a need per se.
When codong at application level, you ignore if lower levels encrypted and decrypted data, modulated and demodulated, packeted and restreamed, resent on timeouts, received in different order and sorted again, passed trough different physical media (radiowave, electrical signals on copper wires, light pulses in fiber optics) many times. At application level, you just pour data in and get data back. Remainder is magically handled for you by lower levels.
That said, when i was tought this during 2002, they started from level 1, tough! Lol! Maybe because i studied electronics not programming, and layer 1 was paramount in that context?
Perfect explenation !
Glad it was helpful! Thank you very much!
Great video, thank you!
Great video with clear explanation
You are very welcome! Happy learning!
This is a great vedio👍👍
Thank You So Much Sir For Your Help 😊😊😀
Most welcome! Happy learning
Holy... this one is just _chefs kiss_
Very good! I'm doing a presentation on the OSI model for my class.
Great! Best of luck with your presentation, Joel!
@@realpars Thanks!
who disliked this video? this is great content
Thank you so much, help me understand easily
You are very welcome! Happy to hear that our video courses help you understand everything more easily!
Keep up the learning curve, and feel free to reach out to us if you have any questions along the way.
Happy learning!
This was so good
sir very helpful presentation. great work
Happy to hear that!
ÇOK FAYDALI . VERY helpful
Amazing, happy to hear that!
This video helped me completing my assignment. Thank you sir for such a beautiful teaching methodology.
You're very welcome, Asif! Glad to hear that it was helpful.
This is great, thank you.
You're very welcome!
Thank You soooo much! Just started Networking & our professor blew threw this as if he was teaching us our ABC'S lol.
Glad to hear that, happy learning!
Nicely explained..!!!
This video is gold!!
Thanks a lot!
PERFECT VIDEO! AMAZING! #subscribed ✅🙂❤️
Thank you!
Amazing video thanks a ton♥️
You're very welcome!
It took 1 hour of this certain subject from my class while this is like 8 minutes and I understood this better.
I swear to God, these college universities are trying to lengthen time on purpose to make use of our tuition fee.
That's amazing to read! Thank you so much for sharing, happy learning!
I wish i have athing better thank four this channel
Good presentation. Thank you sir
You are most welcome!
Con este video finalmente entendí como funcionan las capas muhas grcias.
Estupendo! Gracias
using this to supplement my college data/networking class 😅😅 thank you
Hope it helps! Happy learning
Cengage was okay but this explained the layers way better IMO, Thank you!
Glad it helped! Happy learning
@@realpars thank you!
DAMN and the intro was awesome too!!
Thanks a lot!
very helpful! Thank you
You are very welcome, Janine! Great to hear.
Is it possible to get the ppt. you are using?
Btw. very good explanation, thanks a lot!
Hi Lenny,
Thanks for your comment!
We don't have a specific PPT to share, but you can share our video as long as it remains unmodified, tagged and credited back to us.
Hope this helps!
Let me know if you need any help!
this is awesome!
Thank you!
Fantastic!!! Thanks a ton bro....
Great! Thanks for your support, we appreciate that!
Thanks Lot of Information
Our pleasure!