Each layer of the OSI model and TCP/IP explained.

[@TobyChugg]

8 hours worth of lecture content from the university I attend in 20 minutes and it's more clear. Thank you for the time and effort you put into this fantastic video.

[@stephenwalker700]

Same here....

[@danscourses]

Awesome!

[@DaggerMan11]

Honestly, these short, well-explained lectures are the best way to learn the fundamentals. Most university professors are much better at deep dives into topics than they are presenting the basics.

[@stephenwalker700]

@@DaggerMan11 You must have been lucky enough to have good professors, I've found that most aren't and it's hard to find good explanations and presentations. Although guess that one all depends on who is teaching/presenting.

[@peterthegreat996]

Probably a US college - profits before people

[@kerysherbert8716]

You can literally hear that you are excited about what you're teaching which is (for me) contagious, and makes learning so much more enjoyable. This is great content and has been extremely useful. Thank you!

[@joschlohmann3272]

i agree hardly! it's so nice

[@johnferguson7463]

Best summary I have seen - where was this when I needed it 10 years ago - sooperb Dan

[@JFINZ889]

I have literally learned more in 3 minutes of this video than I learned in 2 weeks of my current application security course. How we process information certainly resides on the type of instructor. Thank you for the help! Much appreciated.

[@mxolisindlovu9194]

same here am new to Networks and i understand 100% better than all the University courses online. i want to be so good with networks practically and this guys is SIMPLY AMAZING!!

[@josiah6328]

Great explanation, I really appreciate the time and thought that went into your presentation.

[@pareshparesh3361]

Sir, This is awsome presentation that reflects your sincereity to teach us who does not have a clue about it. Thank you for this detailed explanation. Salute!!!!

[@L1011MD11]

So far the best concise OSI- TCP/IP layer explanation that easy on the brain cells.

[@lukasa6374]

Thank you so much for this! This was a fantastic overview of TCP/IP and OSI model. After falling behind and struggling to grasp these concepts as a whole, this helped tremendously!

[@suan1]

I've been trying to understand this for 4 days now, and I finally understood it from watching this 1 video. Thank you

[@xunililak1674]

Wish I had ran across this video years ago and maybe I could have lit the fire that I now possess much sooner! NTL thankyou!

[@BilalHeuser1]

Thanks for this wonderful explanation of OSI and TCP-IP. :)

[@benrich5196]

By far the best and the most comprehensive and the most detailed explanation of the OSI model.

[@KhesrawIbrahimi]

Thanks it was really clear and informative For People from the North: To remember the OSI Model -- -- -- Please Drive North To See People's Awesomeness -- -- --

[@jamesgiaquinto3907]

another one to remember is " People Design Networks To Send Packets Accuratly". Love your courses. You have a better way of explaining the technical side making it easy to understand.

[@dhinakaranvenkatesan6586]

Your explanations are very clear ...even a 10 yrs old guy will understand....thanks for your demonstration

[@LisaMcGraw201]

This has been one of the best videos explaining TCP/IP from bits to data. Thank you so much for this video.

[@AkilaAriyathilaka]

Your enthusiasm is palpable, and Thank you so very much fo this wonderful lecture. It was a treat to watch it. 20 minutes went by super fast lol

[@mangeshhercule1193]

Excellent Teaching Sir, A great salute. From South India

[@gusawa9868]

wow thank you sir for the very good video! understood the concept faster from here than from my professor!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[@AyseYilmaz-pm8ob]

It's very useful as you give an overview about all the terms by explaining the abbreviations that come up all the time when learning. Well done and good job:)

[@kodemasterx]

When you hear the excitement in a teacher's voice you can tell he is a good teacher... First time here, I dropped a sub and also thank very much for the slide.

[@yassinadam418]

the best explanation of ISO, which helped me in 20min even though I have been struggling year and half! thank u

[@zglitch4021]

Just completed the module for my college course for the OSI subject... Quite literally told me to read 10 page from a text book, go through one slide show and then take a test... lets just say the test didnt go so well. This video is amazing ! and I am surprised my college course did not have a video lecture on this complex system.

[@deepakk4583]

Very clearly and nice explanation of each layer. Thank you for the share knowledge.

[@gnanajeyam6259]

From data -> Segments (With Port address information) -> Packets ( which adds the destination IP address) -> Frames -> ( which again adds the Mac address) and then to bits. Best video tutorial for osi model in the KZbin. We need more top quality videos from you dan.

[@sharissee5334]

You sharing your slide deck with us just makes this even more better than the presentation and explanations you gave!!!

[@mohammadz1296]

KZbin recommended this video for me, when I saw the channel name I was like: OMG!!! it's been years (since 2013 i guess) since I started watching your videos and you were very helpful, thank you very much, much appreciated.

[@cynthiacotton2399]

Thank you Dan for the information. It was totally thorough. I learned more in 5 mins than I have in a regular course. I needed a refresher since it had been a while since I had to use this and it was great! Great job and I love the enthusiasm you have with it. It makes others enthused as well.

[@davidmckee533]

Dan is the man. He kicks complication in the buttocks and makes it simple. Thank you Dan!

[@louiebee4345]

Cramming for an interview. This is great, thanks!

[@Maya-rw3fe]

Good Luck on your interview!

[@hamzaamir3305]

how it went? :D lol

[@louiebee4345]

Aww thanks, y'all :) I did well, but none of the tcp-ip theories came up. It was for production engineering. Didn't make the final cut but im honestly happy to have made it that far. Looking forward for the next chance 👌

[@hamzaamir3305]

@@louiebee4345 well, wish me luck on my application layer assignment 😂😂

[@eloytolosagomez5298]

Same here buddy, I hope I get asked some of this (they told me they'll do it :( )

[@rl1314]

Thank you! I'm a total newb trying to compete the Google IT cert for a tech support job I applied for and the Network stuff is not well explained and it's beena struggle. I've needed so many additional resources and explanations to get through it and this has really helped me a lot to put it all together as far as the layers and their specific protocols, etc. I'm going to check out your other videos on the network layers. Thank you!!

[@gurkengerd9981]

Thanks for this summary. It really helps to see everything in a wider scope with less detail to get all the connections. Our professor only talks about 1 specific thing at a time and we have to do the connection on our own.

[@anweshabasak603]

Beautifully explained. I have watched multiple videos but this one gives the best information in less time.

[@urbanevolutionlifestyle6209]

Incredibly thorough breakdown. You are a great teacher sir.

[@thegoodsideofit]

thank you for sharing!!, in some part of the world, a million miles away from where you are, this student is grateful

[@danscourses]

I hear you! Thanks

[@upzk7752]

A WOW!! summary 👌 Thankyou so much. I found this when i teach students, i wish if i found this when i was learning back in college. Then I could've raise my marks for sure..

[@chrisa703]

J'ai vu beaucoup de videos sur le sujet. Franchement celle ci exoliquer super bien le sujet. Félicitations !

[@blizzardengle]

Thank you for this great presentation and sharing the slides! I will be sharing it with my System Security students as part of our remediation of Networking.

[@networkengineertechchic5018]

ITS ALWAYS A BLESSED DAY TO RECEIVE GREAT‼️‼️Teachers 👨‍🏫 such as this ‼️💯Great great GREAT VIDEO

[@kalyankonjeti977]

Thank you for the simplified explanation. I thought i need a day to get proper understanding but you have helped me to save my day ( - 20 mins) :-)

[@Me1onPan]

Man better than a 4 hour lecture, this is very well explained!!

[@gabrielaallende3115]

I have been studying for the last 6 hours and your video just saved my midterm, thank you!

[@mattmatthews7555]

Excellent video, great explanations. You just made a whole lot of other IT stuff fit together and make sense. Thank you. Take care

[@atangmachacha5556]

20 minutes and i am ready for tomorrow's exam. Appreciated♥️

[@3227998]

Thank You! I rarely leave a comment, but your video deserves appreciation!

[@tahersadeghi6773]

This is a classic presentation that only Dan can provide.

[@MunyaMazvimba]

dude you are the best. this took me years to understand. i have been following your channel since 2010 November and i have gained so much. thanks a lot

[@Mro0Ali0o]

Hello Dan, Thanks for the informative video. When we say session establishment in the transport layer, do we mean the same sessions in the OSI Session Layer? If not, what is the difference between them?

[@danscourses]

To my understanding, the transport layer session establishment is about the connection establishment with the 3 way handshake. Whereas the Session Layer is handling session communications at the Application layer of the TCP/IP framework. So basically the difference between communication session information using TCP versus the Application itself

[@Mro0Ali0o]

@@danscourses Awesome! Thank you, that cleared things up. ♥️

[@salmankh100]

Very well explained in a short video. Appreciate your efforts.

[@lecyoso]

One of the best explanations I found on KZbin. Thanks.

[@Bill-gc9bt]

Do you have a prerequisite video that explains all the terminology that you're using in this video? NIC? MIME? Wireless Access Point? Firewall? Serial connection? WAN? DNS? DNS Client? Internet Service Provider? end user? session? port? over/on the wire? host? MAC address? local area network? etc.... I definitely want to learn this stuff. I'm just having a hard time finding a basic presentation of this material. Do you have any suggestions? Thanks.

[@rajalakshmil763]

Thank you very much Dan for sharing the knowledge. I should say that your video is more helpful and very clear on the concepts.

[@samarth9769]

I hope i had a professor like you, thank you for this video it helped me alot

[@katrinejensrud537]

This is definitely the best explanation of this subject on youtube. Fantastic work!

[@lorenzop.8249]

Hands down the best vid on the topic, thanks bro

[@glennnorman8981]

There's another one I use going down the OSI model: All People Seem To Need Data Processing. That's always worked for me.

[@theworldisyours2241]

best explanation, watching it over and over..thanks

[@unsbinyounas5488]

Hi Dan .. Can you please explain why there is a trailer for Error Checking at DATA LINK layer while all the other layers have not. Also almost all bottom layer have checksum field for error checking then why we use TRAILER in the DATA LINK ... IT always confuse me ... Never find a satisfactory answer to this question

[@SANDEEPKUMAR-we9ub]

Great sir ! this is a video which explain very simple way and every espect of network layer which is needed for beginner.

[@BungkarasTV]

This is the bomb! Everything that was said is pretty understandable.

[@TheKeeneyes]

This is the best explanation, by far…thank you 💯

[@moustacheboy2350]

First of all, great video! I have a question. Why is RIP not al layer 3? Sinds it's also a routing protocol like OSPF.

[@danscourses]

I guess the best way to think about it is, that since RIP uses UDP port 520 to communicate with other routers it is considered an application/service that, like other applications, requires services from the transport layer in order to communicate with other systems.

[@moustacheboy2350]

@@danscourses ah oké, thanks a lot! :)

[@elpmettsol]

Very good presentation! A little rushed, but a lot to jam in a 20 minute session.

[@alittax]

If I open Chrome and log in to my KZbin account, and then I open a private browser via Chrome and log in to my friend's KZbin account, then does the Session layer distinguish between data that is sent to and from those two different types of Chrome browser windows?

[@techsandwich4483]

Wondered what a bridge was until you explained it. Good to know as my assessment mentioned a bridge (aka switch). Thanks,

[@thebrotherhood1675]

great teaching styke dan, correlating before and after knowledge delivery and allowing for a holistic understanding aswell as specific understanding (your making all the links in your explanations!)

[@mrnobody1321]

There is just one question I would make: MAC address header is added in layer2 for source & destination. But what is destination address? We don't know the MAC of the target, right?

[@danscourses]

The mac address of the default gateway. Because that is where you need to go to leave the network

[@mrnobody1321]

danscourses i see. i supposed we need the mac address of the target outside of the network for some reason. thanks a lot!

[@jerrykadil4855]

I really indebted to you sir, thank you very much for your very clear lectures on the video.

[@pkelly20091]

thanks. You explained the OSI model from a different angle than other presentations I've seen, it broadened my knowledge.

[@mayahelwani5587]

How didn’t I find this video before!!!!??? Love this. Thank you very much

[@pqa-mugaming2046]

thanks, you have saved my exam

[@tumusiimejevunail4474]

Going for my examination tomorrow. Thank you for this 😘

[@chrisa703]

Super clair, très bien expliqué et très complet. Merci pour votre travail !

[@tommy11sixorozco9]

I’m going to start studying for the CCNA before it changes February. What resources do you recommend ?

[@danscourses]

So many good resources out there: "31 days before your CCNA", the Cisco Neworking Academy Version 6 companion guides from Cisco Press: www.ciscopress.com/markets/detail.asp?st=44750 Wendell Odom books from Pearson, CBT Nuggets and Udemy has great stuff too. Make sure to practice taking CCNA practice exams

[@philipjohn1338]

You sir are the man. thanks for making my life easy.

[@LearnWithYK]

Excellent. This is the best explanation I have ever had for this concept of layers. Thanks a lot for all your efforts. :)

[@kevinnjuguna7822]

Best explanation on the internet

[@NZ-bg9ec]

if you watch a videon on Youtbe do you use TCP and UDP or only TCP??

[@JoaoP_M]

Great video, it helped me a lot! Thank you for sharing this! Question: Is this up do date with the current CCNA?

[@nadila3416]

Hello sir, I wanna ask regarding this pandemic covid 19. Would you relate how the 5 network layers work in the spike of low-latency applications (teleconferencing and video streaming), how is the implementation of those 2 things based on 5 network layers sir. I hope you answer me please:(

[@KaliKali-cr4nf]

Thank you for very descriptive clear lecture

[@kailashagoudatammangoudar4455]

Hey Man Thanks a lot . 20 minutes are worth of so many hours.

[@christostz03]

People Desperately Need To See Pamela Anderson !!!!

[@dezza72]

You said that the application, presentation and session layer are data yet then proceed to say that layer 7 has a firewall that looks at packets. How are packets there if that layer only deals with data? Also, how is a switch layer 2 when the data has to travel through a router first?

[@danscourses]

The switch is layer 2 because it looks at the layer 2 information like source and destination mac addresses in the frame headers at layer 2. The switch maps source mac addresses to switch ports and forwards based on destination mac addresses.

[@danscourses]

In the Cisco Academy we use the word Packets to refer to the layer three PDU while other texts refer to the layer 3 PDU as Datagrams. I like Datagrams at layer 3 because people and software generally use the word "packets" to refer to the entire encapsulated network message unit. Like a "packet sniffing program" etc. At layers 5, 6, and 7 the PDU is data.

[@chadzulu4328]

Excellent video, thanks so much!

[@Benhutchie22386]

Really appreciate the time and effort you took for this video. Such a life saver :)

[@andreykot7018]

clearest explanation i ever see

[@ttz255]

Great video! Really helpful with a general overview of the OSI model and its relation with the TCP/IP model :)

[@mfundomhlungu7919]

Great explanation.

[@jnist1-i7y]

Thank you! This helped me to get ready for my exam.

[@damilolaodili559]

Really well broken down and explain. Thank you very much.

[@atikurrahmanmelon6318]

Great explanation. Thank You for this useful video.

[@homemark22]

horray! it is much better than my instructor way back 2007

[@thydevdom]

You sir are an AWESOME teacher! Thank you!

[@bpclowery]

Dan, excellent presentation of the TCP/IP OSI model!

[@kanwalramzan8211]

Very helpful and informative. I understood the concepts so easily. Explained so well in just 20 minutes. Thank you so much.

[@Mr_Matrix]

Thanks a lot! 🙏😃 Very informative. Now it feels like I finally can begin to understand this 😃

[@armaanlakhanpal8567]

way to present , nailed it sir.

[@ZiclopDevices]

Excellent tutorial! Thanks for sharing.

[@celestinestamper686]

Thanks for your explanation of the OSI TCP/IP models. Wish I could enroll in your classes!

[@pcl5636]

Best video I've seen on this