How Switching Works | Network Fundamentals Part 11

How Switching Works | Network Fundamentals Part 11
Welcome to the start of switching! Communication is not new, not even electronic communication. In the old days, to make a telephone call, a switchboard operator needed to patch though your call. This means that they had to manually create a path for your phone call to take.

Switching is a lot like this. Switching dynamically creates paths for network traffic to flow through. But it doesn’t do this all on its own. Ethernet, a protocol that operates at layer 2, is critical to how this works.

Each device that uses ethernet has a MAC address. Frames are sent from one MAC address to another. Clever devices like bridges and hubs learn these addresses, and can make better decisions about how traffic is handled because of this knowledge.

It wasn’t always this way though. In the early days we had bus and ring networks, and eventually hubs. These did not have any intelligence, and operated solely at layer 1. They were also only half-duplex, and had to handle collisions.

In this video, we walk through the past, and see how it affects the switching networks that we have today.

Finally we’ll go through a lab to see it all in action.

In the next video, we’re taking it further with VLANs

Overview of this video:

0:00 Introduction

2:22 Ethernet

7:31 Adding Hubs

11:16 Improving with Bridges

16:58 Introducing Switches

21:02 Lab Time

Vintage footage from:

LET'S CONNECT

#NetworkDirection

[paulshaddick]

I am teaching Communications Technology to 17 year olds. I have few resources available to me and very little background. This Network Fundamentals series is a fantastic resource which our school could not afford to access otherwise. I have happily paid for your quiz answers too!

[techie]

You are a lifesaver! Thank you so much for your time spent on educating all of us, starting from the basics! 🤗

[alexw]

The work and effort you pour into this series is amazing! I am actually studying more into the fields of chemistry/process technology but now binge-watched the series up to now during the last two days! It is amazing to learn something completely new and you explain it so well! Love your graphics/animation to support your words.

[gamingreinvented]

Thank you so much for making this free series!❤️

[blackettcharlie]

I'd just like to say thanks for this Series! I've made it up to this part in just under a week and I've been really enjoying it. You've given me that spark again that makes me want to get out of bed and learn! I've been missing that for a long time. I'm even enjoying pausing the video to absorb and take notes!


Keep it up! You'll probably have another Patron some time soon. :)

[senmuwizard]

This is top class presentation. The best I have attended so far. Came here to understand only about IP. The presentation was so good that I ended up watching all. :) Thanks for the videos.

[anticringe]

this is treasure, thank you very much

[sachinbkhandare]

You have great knowledge with presentation skills. Very good examples. Easy to understand.

[DuaLeaD]

Far better teaching than the long, drawn-out TCP/IP, networking, and data comm courses I took in school in the mid 2000s. Man I wish more pro videos were around back then, would have saved me time and money!! Excellent channel, I will be watching all your videos!

[Kaya-Atabey]

Greate work on all Videos mate. Especially VXLAN series you made my day on those. Only thing that bugs me in this video is telephone circuit and switch example. Although you are right switching is switching, it would be better to state the circuit switching and packet switching difference since swapping from circuit to packet switching was something really really big.

[trendyniro]

Your teaching is smooth sir! Thank you

[DuaLeaD]

QUESTION for Network Direction:

WHY do schools and IT professionals still teach hubs, bridges, and token ring?

This is just bizarre to me. I started networking classes back in 2004 and gigabit Ethernet was already becoming popular. When was the last time any hubs or token rings were actually DEPLOYED? 30+ YEARS AGO?!

I get that concepts build on each other but if you get into a networking environment that uses these, it is negligence on the company's part. Never in my life have I encountered a real "hub", but then again, I am only 35 years old. Even in 2004, I thought the community college networking courses I was paying good money for were quite antiquated and behind the times. It's like teaching TGV and Mag-Lev train operators how to run steam I missing something here?

[ali_HA]

Nicely and clearly explained. A well refresher on switches. Greatly appreciate your efforts!!!

[ForyantoJayaWigunaChannel]

Your explanation is so clear, I love it...

[franciscosencion]

Great video!, Question: do you script your videos or just talk on the fly while recording?

[rafaeldonegatti]

Holly Cow!!! That's Renata Sorrah at 06:23 starring our brazilian meme Nazaré confusa!!!

[rendogrendog]

great video sir! thank you very mutch for your effort!

[daniel]

Hello! Very nice explenation, however, one thing is not clear to me. How does a computer connected to the LAN which is sending some data know the MAC addres of the destination device?

[avinashgore]

You are awesome I'm getting all concept with ez... Thanks for your efforts...

[jonathanamakoh]

Nice clear explanations, thank you so much! I do have a query on the answers to one of the questions. In Q14, did you mean to pair port Gi0/1with the MAC address 0e00.4d67.cba1, or did you mean for it to be port Gi1/1? From how I understand it, on the answer you gave on Patreon, would have been asking of the latter port.