Keep in mind that OSI model is not laws of physics. It is only a guideline. While many protocols fit neatly into one of the seven layers, others do not. But OSI model is a great tool to learn and understand how network hosts communicate with each other. Any serious network professionals and students should know about it.
!!! Correction note: from 5:09 to 8:09, Computer A's IP address' fourth octet in binary should be "00000010". Sorry about the confusion. ---------------- E
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if anyone asks you about the difference between two different TCP/IP networking technologies, here is the general guideline for your answer: think of the differ
5G cellular or mobile technologies are the focus of this video. It includes a brief history of the four generations of cellular technologies. Then I will talk
Network+ Training Course Index: http://professormesser.link/n10006 Professor Messer’s Course Notes: http://professormesser.link/n10006cn Frequently Asked Questi
In this video, I will talk about two of the last mile technologies: Dial-up and DSL. The last mile refers to the segment or portion between a local telecommunic
Data encapsulation is about creating and wrapping user’s data with control information layer by layer and data de-encapsulation is stripping off control informa
The OSI model even though not adopted in modern networks is still referenced in modern networks.
What is public key infrastructure? What is trust? Why do we need trust over the Internet? Who should be trusted? In this video, I will talk about two trust m
Today my topic is three types of multiplexing methods: Time Division Multiplexing (TDM), Statistical Time division Multiplexing, or STDM, and Frequency Divisi
At 4:30: A mistake: step 3: When the file server gets the token, it "decrypts" (not "encrypts") the token with the secret key shared with TGS. In Greek mytho
This is an animated video that explains the difference between a hub, switch, and a router. It explains how a router works, how a switch works and how a hub wo
Class B ID - Subnetting https://www.youtube.com/watch?v=wuIdYxaV46Y&t=10s A subnet is a logical subdivision of an IP network. The process of dividing a netwo
https://nwl.cl/2zb3FUQ - This lesson is an introduction to the OSI model for networking students.
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Secret of Subnet Mask: https://www.youtube.com/watch?v=yLeuGOOrUvo&t=5s ARP: https://www.youtube.com/watch?v=NpiORFxyM4c&t=1s In this video, I will talk abo
In this video, I will talk about how classic private TCP/IP network was set up for the first two decades of the Internet. Why it did not work? What is network a
In this video, the OSI and TCP/IP models are discussed and compared at a high level. Note that TCP/IP’s bottom two layers are called a lot of different things (
Network+ Training Course Index: http://professormesser.link/007course Professor Messer’s Course Notes: http://professormesser.link/007cn Frequently Asked Questi