How the OSI Model Works | Network Fundamentals Part 3
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- เผยแพร่เมื่อ 2 มิ.ย. 2024
- How the OSI Model Works | Network Fundamentals Part 3
The OSI Model Explained
Surely you've heard about the #OSI model. That's why you're here right?
Well, this is the right place for you! In this video we discuss models, and why they're used. We look into the physical, data link, network, transport, session, presentation, and application layers, and how they relate to the real world.
And finally, we look at an example. This shows how a web request flows through each of the layers.
For further study, I recommend:
CCENT/CCNA ICND1 100-105 Official Cert Guide
(affiliate) click.linksynergy.com/link?id...
networkdirection.net/OSI+Model
The answers to the quizzes in this video are found at:
networkdirection.net/Understa...
In part 4 we'll Look at how IP addresses work
Attribution
How to write address on the envelope correctly
• How to write address o...
The modern postage stamp
• The modern postage stamp
Disclaimer
This video contains affiliate links. I receive a small commission at no cost to you when you purchase using my link
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THIS is just a goldmind. When ppl say "yea, jus go watch youtube." they talking about watch these kinda guys,
Dude thank you u really peaked my interest in these videos and in networking in general. Keep up the videos m8.
More to come!
Umm, do you mean a goldmine? There's no such thing as a goldmind.
6:33
My answer is:
The transport layer is responsible for the ports, which manage the flow of data going through the ports. If an application is using too much bandwidth, we can control its data flow in this layer without having to interrupt its process in the application layer.
Well thought-out, well done.
You might also be interested to have a brief look at a technology called 'Quality of Service' (just a brief look, it is quite complicated)
@@NetworkDirection Thanks for the tidbit.
Why not the netowrk layer?
This playlist is a brilliant internet diamond: state-of-the-art quality video, very didactic flow, prime material content made simple, making abstract concepts turned from boring into fun and understandable. I truly appreciate your dedication, love and time put into this. The rare magic of teaching concepts to newbies or tech-savvy professionals was accomplished! And a fun reference to IT Crowd is just the cherry of the cake!! Good job! ❤️📺
My guesses on the 11:59 quiz:
TCP/IP applications (Protocols): FTP(File Transfer Protocol), SMTP(Simple Mail Transfer Protocol), Telnet - Application layer;
JPEG, MPEG, TIFF, GIF - Presentation layer;
Service request, Session Control Protocol (SCP) - Session layer;
Flow Control - Transport layer;
Application layer: End-user services like web browsing and file transfer
Transport layer: checks and fixes errors, then delivers data error-free
Network layer: routers work at this level, and decide how and where traffic is forwarded along a path
Physical layer: Hardware for sending/receiving data on a medium
hope I didn't misunderstand something, if did please correct me.
Love this, just backed you on Patreon - more than a fair deal! Thank you for compiling these. One thing; as a total newcomer, I was a bit confused about the mention of "layer 1" or "layer 2", even though this was specifically mentioned in the beginning. Would've been good to have these a bit more explained in this context.
I've found these videos you made it quite helpful, once again i'm appreciate for it. It's accepted by everyone that is quite hard to find these kind of highly helpful materials. Expression is fluent, every stranger term has got a detailed explanation. Also, god should bless you as everyone does wish. Cheerz!
Simply stumbled across this page and I am a 100% contributing to your patreon. You are a GIFT from above.
Thank you! You're the best!
Thanks for the great vid, man! I'm already an Electronics and Comms Engineer and is trying to revive and build my knowledge regarding networking. These vids help me a lot!
so thankful i found your channel! Thanks very much! 👊
Keep up the Great Videos! I just applied for a Junior Networking job at my office after doing software development/testing for the last 5 years. These videos have helped to understand the Network side and be prepared for the upcoming job!! Take my Like, My comment and my subscription!! Well deserved!!
keep up the good work I am watching these before networkfundamentals class begins
Perfectly made for students like us. Hats off to the presentation skill that make me clear about the topic and now I can teach others too. Thank you!
Your videos are how I wish every other educational video would be.
That's kind of you to say, thank y ou
When I start, I only want to know TCP/UPD protocol. But your course is amazing!! I like to watch more and more! Thank you!!!
Thank you for making these videos! Explanations are much better than in my university course!
Great work. Really enjoying these
Thanks for such great explanation of the concepts. I thought these were very difficult to understand. But you have made them real simple and easy to follow.
Good to hear!
thank you - helped me alot in this lecture - i will revise the video again for more better understanding. Great work.
I am currently making a career switch to IT. i greatly appreciate your good explanations with short catchy videos. i have already learnt so much more. thank you!
Amazing lesson retainable and visual stimulating 😊
Great video and a great series.
Currently studying electrical engineering and this topic is a new elective for us this year, so cheers for keeping me ahead of the game so far!
Keep up the good content, will definitely be sharing with all other students.
Thanks Alan, I had no idea networking topics were used in electrical engineering.
What other network-ish topics do you need to cover?
Finally, someone is explaining networking and I am awake.
Nice to hear it, thanks
Thank you for these videos. I was struggling in class because my teacher goes off topic a lot. But this solidified it for me.
Glad to help
I'm happy having you to teach me all this
Best understanding of encapsulation. This is one of the best videos.
Thanks!
Your better then my network professor. You explain it very well can’t wait for the next one!
Thanks!
Just a few more days until the next one
Fantastic series! Thanks!
I've already done CCNA1 but this is great to recap and I thoroughly enjoy your presentation style
Awesome, thank you! I am glad you enjoyed it!
This is the best way to teach. Great graphics and illustrations. Keep up the good work.
Thank you so much for sharing this feedback!
Hi hope your are fine Sir, I enjoyed when youu send Analogy and mad a good one, it will stick better in my head, cause I had a better idea of the mailing than OSI. Thanks
Excellent, that's the example I was looking for ❤
Glad to help!
Just bought the 2.00$ subscription, thank you for this work!
Thank you Jevster! We really appreciate your support!
thank you so much for making these videos :)
I am starting my last semester. The whole semester is on networking. I cannot wrap my head aroumd learning from the textbook, so I am counting on you to get me through!!! Thank you for this and the Patreon content.
Man, this is very comprehensible! Thanks a lot so far!
You're welcome
This makes so much sense thank you.
I really like the way that you simplify the information 👍🏼
Thanks, that's one of my goals when making these
Great videos! Thank you very much!
Very well explained! Thank you.
Thank you!
amazing explaination . One of the best videos I have seen on this topic
Thanks very much! I'm glad this video was helpful!
Thanks Mr , nice information !
Superb! Love it. Thank you.
Thank you!
Thanks a lot for making these videos, I got to learn so much and I don't think I'll forget what I learned here.
Thanks Jayashree, thats great to hear!
Respected sir this is Manoj from india.
Your way of explanation and simplicity i never experienced in my college. With a huge respect my eyes are dropping tears of joy.
That's a huge compliment, thank you!
These video series are just amazing 😊
Thanks
Man I love your videos. Helps a lot in the college! Thanks you !!
You're welcome!
Thnx, as a computer sci major this pluses
that intro LOL, best network tutorial in the history of youtube!!!!
Soo good to hear, thansk
Hi. Thanks for the effort. I just had a comment regarding the answers for the questions on the suggested website. We are required to be a member of Network's Patreon at $2 or more. Not happy with that.
This video really helped me solidify the OSI model into my memory. Please Do Not Throw Sausage Pizza Away!!!!!
You'll never forget it now :)
Been a detective for the past 3 years. I want to go back to school for information security. Gonna watch all of these and take notes prior to getting back into school.
Glad to help you on your journey
These videos are so useful
Application is closer to the end user, Transport delivers data in an error free way, network decides how traffic is forwarded and physical is the hardware to actually send the data over a medium
Excellent presentation. Thank you.
Glad you enjoyed it!
When I found this video ,I knew I struck gold mine.
Thanks! That's a nice comment to start my day with
excellent explanation
I always remember “All people seem to need data processing”
Wow. I love your videos. Better than any lecture at university...
Wow, thank you!
thank you! this really makes sense, and helps a lot
Glad it was helpful!
a lot of thanks to you buddy these are really in depth knowledge videos
So nice of you
These videos are great! Thanks
Thanks!
Thanks for sharing.
Looking at this makes you understand why there is a TCP/IP model.
Miga Arumai! Valthukkal!
thanks
Awesome so far!
Thank you! Cheers!
im doing computer science degree specialized in network tech and cybersecurity and this series supported my revision for first sem networking exam last year.
This video is pretty hard
Great videos, thanks.
You're welcome!
These tutorials are very insightful, thank you! I'm just kind of confused about how the layer 2 address of the frame doesn't change when it goes through the switch. Is it because the logical link between the two endpoints are created by the switch?
Absolutely fun. Thanks.
Glad you enjoyed it!
Great video❤️
The intro got me!!!
love this!
Thanks!
I came to these videos to get info on
the basics for setting up a basic network for a quick job, and my brain is full of knowledge XD
Wonderful work...but hoped the answers for the little quiz was right in the vid
It would make the videos a bit too long. Some of these are quite long already
Thanks for this great video 😊
You're welcome
Can I get the answer of the question ? I need it on my activity . Please🙏❣
Can I get the answer of the question ? I need it on my activity . Please🙏❣
Thank you for calling IT, have you tried turning off and on again. I love it! The IT crowd is amazing!
Most iconic IT quote on TV
Loved this video also 💖
Yeah this was an amazing series! How's your progress 2 years later? Just curious
@@trbgraphics5557 well I didn't pursue it. Just wanted to explore some stuff, computer related of course. Right now learning Java in a bit detail. Android programming.
@@Ari-118 Oh that's awesome. So what do you do as a main career? or are you a studying still
@@trbgraphics5557 no no, just a hobby.
Thank you!
Phantastic content! Im happy to support you on Patreon :)
Thank you!!!
I am confused so the transport takes care of the transport using udp or tcp protocol. With the example of port 80 it knows it needs to go thru the webserver. It adds a header
The network makes sure it know it route by adding an source and destination ip. Adds it as a header
Together they make sure the data is send to the right location?
The data link makes sure it is in the right lan segment adding another header and a trailer correcting errors?
Because it may hop from router to router the mac adress can change but the ip stays the same
way above my head in understanding the material here. I'd like to know why it takes these steps for data to get to the destination host, then I think I would understand the description better.
these steps are required so that the data can be safely and correctly sent to the reciever
Sir, with deep respect I would like to tell you that they way you explain these things is just awesome. I would like to talk to you about it all. If you got little time please let me know. I will wait for your response. There are two outcomes : either you reply or you do not reply. I am really hopeful that you will take atleast a minute to talk to me. Waiting eagerly. Thanks for these videos.
Hi Amber, While I can't promise much, you're welcome to contact me at feedback@networkdirection.net
yes it is use ful
I wanted to learn everything from the basic to advance. Please suggest me some books to pass certified exams.
"I'll put the answers on the website of course"
>Goes to website...
Crap I'm broke, I guess no answers for me.
Yep, please don't pull that BS. Tell us the answers.
@@bharatsharma9641
Alternative solution - Address it at the application layer. Switch the application for another, less data hungry one. Or if it's an in-house application, optimize it.
@@bharatsharma9641
It is situational. In most situations, adding more bandwidth is cheaper.
You would need to increase bandwidth at the physical layer, so both compute and the switch ports would need to be at higher bandwidth. eg. move from 1gig to 10gig connectivity
Seriously, you don't have aprox 3 $ for this amazing content? I think you're saving your funds on the wrong end.
Have you heard about tls transport layer security or tls handshake can you tell is it in osi model's transport or its something entirely else pls explain ,good session although
Yes, I've heard of TLS. It's critical for security.
It's a much deeper topic. I have some videos on security if you'd like some of the basics
great
Thank you so much for all the classes Sir, they were really helpful. Just a doubt, does fragmentation of data into packets happen at the transport layer or network layer? The book I've read it from mentions Network layer, but you've mentioned transport layer in your video?
Also, just related to the addresses
Transport layer: Port number
Network layer: IP addresses
Data link layer: Mac adresses present in the NIC.
Is this right Sir, I hope I've understood it correctly?
It looks like you've understood it correctly.
The data from the transport layer is broken into packets, if that's what you're referring to
Packets are sometimes too big, and need to be fragmented into smaller packets. This happens at the network layer
@@NetworkDirection so first data at the segment layer is segmented into segments, and if according to MTU the packets made at the network layer are too big, they are further broken down and this is known as fragmentation. Am I right Sir?
Another doubt that I had was that when we say that layer 2 adresses keep on changing, we mean that the MAC adresses keep on changing depending on whichever device is next, be it router or host. But layer 3 address remains the same, as in the IP address in the frame is only of the destination, whereas the layer 2 address keeps on changing. I hope I'm correct?😬
Also, in your video you asked us to match certain descriptions with the layers. The description was: Delivers data error free... I feel that there could be 2 answers to this, one the Transport Layer due to connection oriented protocol TCP, but also Data Link layer since it adds the trailer to the frame for error correction?
Are there actually 2 answers to this, or am I going wrong in the concept here Sir?
@@NetworkDirection I really appreciate you replying to my previous doubt Sir, and if you dont mind me saying, you have a really good voice 😂👍🏻. Even when I'm reading my computer books, I tend to hear them in your accent 😂
@@avantikak6480 You've pretty much got it. There are some exceptions to this, but you'll find those as you go along.
You're right, layer 2 does have the trailer. Here's something to think about: Is TCP the only protocol operating at layer 4? It might help to watch a few more videos, then revisit this one.
@@avantikak6480 Thanks! I don't hear too many people complimenting the Aussie accent
I lOVE your videos but can't afford the answers :( That suxs but ty for the wonderful videos. I have subscribed :)
what is the answer of the question number 1 about "which layer should be addressed"
Transport layer breaks down app data into segments/datagrams, but I am confused if network layer and data link layer function the same, like data link layer breaks down packets into many frames , so one packet consists of more than one frame? Thank you!
Usually just the transport layer will do this.
Sometimes a packet (layer 3) will need to be fragmented in to smaller packets, but we want to avoid this.
thanks but still not getting it right in my head but I will revisit this video various times to understand OSI layers..
It can take revision. Just stick with it, you'll get there.
Maybe look at some videos from other creators too. Some times we just need to hear a concept explained differently, and suddenly it all makes sense
Answers to the quizzes are only available with a login? :(
Thanks for pointing this out, this is now fixed
@@NetworkDirection its not yet
Is it me or Part 1 is amazing, then the rest of the parts are dropping in quality and explanation is lacking in certain portions. Now there is a forced contribution by patron to see the answer, if not then the gap of the lack of understanding would increase per part
nah, just you 😀
maybe because its getting detailed and going over your head. Its same quality and hopefully I will get selected tomorrow for the job by learning from this
@@NetworkDirection 💀💀💀😂💀
Just you dear
please some one tell me what is said in the quize1 ,, When a high bandwidth applications is causing to the network ' to slow down', then Transport layer is addressed. I can't understand this
data needs to be segmented and thats done by TCP or UDP and they are layer 4
Another question: Why the source MAC address of the second frame is not the same as the destination MAC address of the first frame?
Routers update the source and destination MAC as frames pass through
How does the router know the mac address of the server? Does it request it from the server using its ip?
That's a good question! This uses a process called ARP, which is discussed in a later video
Is this Hugo from DataCamp? Excellent Videos
I've never heard of Hugo or DataCamp, but I'm glad you like the videos!
Any chance you work in the basement of an office building with a collegue named roy?
bruh I feel personally attacked
Pretty good, only a could of things that could be better. You don't define what acronyms stand for... Eg OSI and also assume the viewer knows what some things are.. eg asking about how to Fix a bandwidth issue when you haven't explained what bandwidth is in any of the videos in the series thus far. Besides that this is a very good effort at explaining networking to beginners.
Thanks for the feedback.
One thing I've tried to do is keep this practical. Sometimes I feel that listing details like what acronyms stand for makes it more like a dictionary, encyclopedia, or RFC. So that's why I sometimes, deliberately, do this.
Good point on defining bandwidth though.
6:25 - I would guess layer 3 as it involves QoS and load balancing