Switches and Hubs

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23 hours 18 minutes
Video Transcription
Hello and welcome back to ice and the one interconnecting Cisco networking devices. Part one.
This is Episode 1 to 4. Switches and hubs. I'm trading Darrelle one. I'll be your instructor for this course.
The last video we went over what the Datalink Protocols are and how they all operate.
In this episode, we'll be coming switches and hubs and how they use frames to communicate over the network.
Quick learning objectives here, we're gonna learn about full duplex, half duplex,
and then we're gonna go over a little bit of the frame 40 logic, and lastly, we're just gonna go over some switches and hubs.
So quick, pre assessment here,
what layer switches considered? I know we talked a little bit about in the beginning,
but if you want to go ahead and pause the video, I'll give you a few seconds to answer.
All right? Hopefully you guess, Layer to know if you go Slater three is that's not necessarily wrong as well, because there are layers, three switches and their utilized more and more enterprise environments. Nowadays,
I have a few of, um uh So I'll take where three. If you got it.
Not differences and transmissions of Simplex you're looking. If you're looking at a picture that right you're looking from just client computer to the server. Just that one way transmission.
Now half duplex goat can go both ways. It can transmit from point A to B and B to a,
but I can only do it at one time, so only one person could be transmitting at a time. You could either transmit or you can receive
not full duplex. You can transmit and receive it both times at both end points,
a little bit about hugs and half duplex, so hub is considered a physical layer. Layer one device. So when it does the winter season electrical signal, it'll actually repeat it out all the ports, except for that one. It was just received on
because if it didn't do that, what would actually happen is it would slowly flood itself. Becks. It would go back to the original point,
go back to the original Switzer hub
and just keep bouncing back and forth and eventually to cause a flood of the network.
It's a little bit. What they do to prevent collisions at this is they send it half duplex right
so the way that they do that was with the C S M. A CD, which is a carrier sense. Multi access, multiple access, collision detection.
So what does the note can kind of check for an incoming frame before it tried attempts to send out any Ford attempts to send out any frames.
But if two notes happened to send a frame at the same time, it's gonna be detected by one of the Sunday nodes. And what happens is the 1st 1 A detective's gonna kind of send out a signal so that the others know that a collision has happened, and then both, um, will choose a random time to resend their frame.
So we're looking at switches now. We're looking at full duplex. It's which is gonna be a layer to device. So it actually looks at the frame and not just the physical layer.
And the one thing that switched us is it has a camp table,
which you can see on the bottom. Right is the Mac address table, so that came table. It learns the incoming Mac address and their corresponding switch port.
So if a frame is received from client a port one. Then I'll remember that Mac address of client AM Port One that we wanna frame comes in destined for client. A search is that Mac address table looks for that Mac, and that determines it needs to go out port one because of where it's at.
Now, if you look in the picture right, you can see fast. Ethernet 01 has quite a few Mac addresses.
This is pride caused by it being age from port,
which is going to connect to either a switcher router.
So we will get faster than 0 24 That's probably a trunk port as well.
So quick, post assessment Here. Hopefully you guys can remember. This is the big takeaway from this lesson is just a short one.
At what duplex? Do hugs operate it? And what
duplex do switches operate at? I'll give you a few seconds, pause a video and answer the question.
Okay, Hopefully you got this one. It is half duplex for hubs and full duplex for switches.
And the next episode we're gonna be starting to look at the whan are the wide area networks.
And once again, if you guys have questions about this lesson, er if you need any help,
go feel free to contact me. And, as always, thank you for washing this episode that look forward to seeing you next lesson.
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