Purpose of Subnetting

Video Activity
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Time
1 hour 19 minutes
Difficulty
Beginner
CEU/CPE
2
Video Transcription
00:00
Hello and welcome back to cyber is creative submit. Today we're going over the purpose of submitting. I will be your instructor trained. Jiro, let's go and begin.
00:11
All right, so in this lesson, we're gonna learn a little brief, brief history on dividing networks. Also, we're gonna look at why we do sub netting today.
00:21
So the history of it, if you're looking at broadcast domains, right, you're thinking about theological area of a network in which a broadcasted layer to frame it can reach all devices in that area.
00:30
Which that would be a destination, Internet address or Mac address of all AFS. Rex Steph would be the maximum number
00:39
you can reach an accident symbol.
00:43
So this would be you think of your network at home? It might be 192.168 That 10 on a slash 24. So the host i pease air gonna be in that last last octet there, Right?
00:57
So essentially a broadcast appeal to hit everything from 0.12 all the way to dot to 54 right?
01:03
It's gonna hit every single one of those devices.
01:07
So in the past, it wasn't required that much because what? We had small networks. We didn't have the networks that we had today. I mean, you talk about networks nowadays. Every printer has an I. P. Address. Your coffee pot has one. You have, like all these laptops that are roaming around, let alone that, you know, everyone gets back to their desk. Then they had their desk computer.
01:26
We all have VoIP phones nowadays. I have I p addresses.
01:30
You have all this stuff that Senator, all this traffic. So you have to find a way to bright break up these broadcast all mates.
01:38
Now, if you give every device type, I guess like VoIP computer, laptop printer, if you give each one like a slash 24 or even like a you know, a class full network size
01:49
you're gonna run out of I P addresses super, super quickly.
01:53
Um, well, you know, if you had to do in the past, you know, you might have three or four different networks, but now you have so many different devices on so many difference devices per type that you would have run out of actual i p address spacing. So that's where we get into actually be able to break up these networks too
02:14
properly. Utilize our I p space, right,
02:16
Because now we are lessening the effects that networks they're gonna hit with these broadcast Frank's because they're gonna hit that router and they're gonna stop. Usually
02:25
that might get broadcasted back down,
02:29
but they should stop at the router, especially. You can't use cases where it won't Router won't stop it. You're not gonna get into semantics about
02:37
Just know that routers generally break up. Broadcast to Maine at a plebian later. Three advice. So here's what I was talking about with that broadcast frame being a destination address of all laughs. Right. This is an AARP message, just in case you're curious
02:53
what that is a address resolution protocol. So what this computer is doing is he's looking out and he's saying, Hey, who has this I p address? You know, 192168 10.50. But who has this I p address? He sends it out to that address there,
03:10
which everyone on his sudden it is going to receive that
03:14
right, So everyone sees that, and then eventually someone will respond and say, Hey, I have this I p address. This is me. Here is my Mac address. You know, the way they could move forward. So real short lesson today, a real quick one. We just very briefly went over
03:30
the benefits with nothing. But first we do a quick quiz question. See if you remember what device will break up a broadcast domain.
03:39
I'll give you a few seconds to think about it.
03:44
All right? Hopefully you all got router.
03:47
And yes, I know some of you may be saying, Well, a switch could do it. And yes, if you had a layer three switch, you could break up your bras case to means,
03:54
But we're just talking about later to switch right now.
03:59
Well, yes, he's So you could say that when you were talking about routers. So let's continue on to these summer here. So when over the brief history that went over the definition of a broadcast domain, we also looked at how broadcast friends moved through a networker. We talked about it,
04:15
and the next one get into some of the different I p four addresses. Um, and as always, thank you for watching this video for just seeing you in the next one.
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