how the OSI model works on YouTube (Application and Transport Layers) // FREE CCNA // EP 5
Source: YouTube · NetworkChuck · published Aug 27, 2020 · 21:56
This video explains what happens in the upper layers of the OSI model when watching a YouTube video 0:24-0:34.
Key Takeaways:
• The application layer serves as the interface for network-reliant programs like web browsers to access network resources 2:02-2:37
• The presentation layer handles data formatting (HTML, JPG) and encryption (SSL) to make data presentable 2:52-4:22
• The session layer maintains communication channels between applications and servers, authenticating and managing multiple connections 4:29-5:51
• The transport layer uses TCP (reliable) for web page loading and UDP (fast) for video streaming when watching YouTube 6:14-9:32
• Port numbers enable multiple services on one server, like port 443 for HTTPS, 22 for SSH, and 21 for FTP 13:01-16:59
Understanding these upper OSI layers is essential for comprehending how network applications function 20:29-20:44
Sources:
- 0:24-0:34 Introduction to OSI upper layers
- 2:02-2:37 Application layer explanation
- 4:29-5:51 Session layer functions
- 9:38-12:54 TCP vs UDP in YouTube streaming
- 13:01-16:59 Port numbers and their functions
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First 800 characters of the transcript
this is episode five of my free ccna course and a huge shout out to bozon software the official sponsor of this ccna course they are the reason this can be made available for free so i highly encourage you to go check them out they have the absolute best ccna ccnp labs and practice exams when you watch a youtube video like this one what happens what's happening in the network in this video we're going to find out we're going to focus on the upper layers of the osi model the application presentation session and transport layers and see what happens when we try to watch a youtube video let's get started [Music] in our last video johnny needed copy bad and we watched how his internet traffic his network traffic would go across a network across the internet and get to network chuck coffee wher…