Ethernet Switches Explained (L2/Link Layer Ethernet Switches & Hubs)
Many of us use layer 2/link layer Ethernet switches at work and at home for connecting multiple devices onto one network., but, how do they actually work? How are they different than the Ethernet hubs that came before, and why? How does a switch know where to send traffic despite (usually) having no UI or other external interface?
In this video, we explore network switches and hubs, and explore how they work and how they evolved!
Of course, since this is one of my videos, this also includes several fun tangents and side-lessons including a summary of the OSI layers (mostly 1-3), as well as an example of how a router in this situation would work with routing tables and interfaces, as well as a description of ARP and how it's used in a network.
We walk through all of these concepts with step by step examples of how packets would be sent and switched and added to switching tables, as well as a high level view of how everything on the network works!
Timestamps:
00:00 - Introduction
00:40 - Hubs and the Bus Topology
01:36 - Packets and Collisions
04:21 - Switches
05:53 - OSI Layers
10:45 - Routers
14:48 - ARP
21:22 - Intro to Switching Tables
24:19 - How Entries are Added
32:52 - Using the Table
33:37 - Back to Routers
37:00 - Switches are Transparent
38:21 - Chaining Switches
40:46 - Conclusion
Corrections/Errata:
(Please comment below if you spot a mistake!)
Notes:
04.00 - Ok so this is a bit of an exaggeration - it's why you didn't see 24 port hubs. The building in question was however using 24 port 3com 100mbit switches, with 4 port 100mbit hubs at the ends...
Sorry if it looks a little weird - I had to record at 540p due to a quick with the camera, and what you see is a blend of an AI upscale, a lanczos and an anti-aliased upscale...
Yes this is a long video - this is a bit of a recurring trend with my videos, but I didn't want to split it up in this case. Feel free to watch at 2x!
Thanks for watching! I hope this video helped you out!
Produced by Tony Tascioglu
https://tonytascioglu.com
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