The Basics of a LAN and How Ethernet Switching Works

The Basics of a LAN and How Ethernet Switching Works

A LAN is simply a collection of devices constrained within a localized area. More specifically, in the context of 802.3 (Ethernet), the term LAN would be used to define any network using Ethernet for communication. We can also include wireless (802.11) into this as well.

Ethernet switches play the biggest role in today’s LANs, and so do wireless access points. But have you ever been curious about how Ethernet switches work? Well for starters, they learn MAC addresses and forward frames. That’s just a textbook answer though… If you want to dive a little deeper, check out the video! I’m hoping that you find it useful, and as always – I hope you learn something!

Video Timeline

0:00 – Introduction
1:03 – What is a LAN?
3:21 – Defining Unicast, Broadcast and Multicast
5:23 – Why Do We Use Both MAC and IP Addresses?
7:25 – How do Ethernet Switches Forward Traffic?
10:03 – How Do Devices Learn Other Device’s MAC Addresses? (ARP)
13:32 – Switches Learning MAC Addresses
21:02 – Just Stick With Me Here, There’s Less Than 3 Minutes Left!

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