Welcome back, everyone. All right. ccmp switch, huh? The 101 15 good stuff. Campus network design, right is an introduction to that particular section. Now, this section no more crazy, or is it just introducing to you what we're going to talk about in this particular section?

And I'll give you an insight. Alright, so certain things like logical design, everything we do is a logical design. Yes, we physically have to connect the cables where we go and we'll get a visual representation of it here pretty shortly, but you have to decide which way your traffic wants to flow. Remember your OSI model, you have your layer three, which deals are routing protocols, right? That decides Okay, based on the algorithm that routing protocol has, which path is it going to choose? All right, and layer two has a physical topology.

Okay, that's how you're laying out the cables. But they work together, they work together. And later on, we'll talk about how layer four comes into play with this as well. But the logic design the process is to build a new switched campus network to be able to modify, improve the existing network. So you want to modify and improve the existing network. And there's many ways of doing that is you're not getting brand new cables writing equipment, and then you have the same design.

We need to change the design. These are the things that we're going to talk about, how should we design but we have to go back to the basics in order to do that. Now here's says using layers, and you'll hear this a lot building blocks for network design. There are going to organize and streamline a very complex network when you're doing something. You do it without Are you annoying? And I think I've said this before when we talked about routing in the CCNA.

Okay, now remember, we're in the ccmp. But you can get away from the basics. When you make a decision to go somewhere, wherever it is the local supermarket, or nightclub, or park or gym, whatever it is, you decide, okay, well, it's this time this is your algorithm in your brain. It's this time, people must be leaving for work, I know that highways going to be congested. If I take the streets and go through the back roads or parking get there quicker, or I could leave at a later time travel at this this. So you're making all these different decisions using all these different variables to create a certain data path, and you're segmenting all these different things in order for you to get quicker where you need to go.

And this is exactly it. Because another model that you should be very familiar with, is your Cisco three layer model older kill laughs architecture that they call now. All right. So all these things, these building blocks, because they're not just building blocks in the sense of, Okay, let's just get the foundation going. Whereas because you're actually going to put things into different segments, that's what they mean by these building blocks. Okay?

You're gonna use these particular design. So he plays in different locations to provide max scalability and functionality, efficiency, scalability. scalability is the biggest issue in business. And in no and and the network is your business. Because if your network is not efficient, and your information cannot get to where it needs to go, quickly, you're going to have a problem. Now I'm going to show you a design.

I didn't draw this. Oh, saying the truth scouts honor thing is two fingers. Three, I don't okay. But it is a network design is an enterprise network. Okay. So the whole the whole crazy, don't be overwhelmed.

All right. Well, Lots of equipment, a lot of equipment. Here's your core right here. These are the blocks that they're talking about. They made things into different blocks. And the way when you see these circles right here, that means that all those cables are aggregated.

Why they're putting they're all working as one. So you can increase the bandwidth from switches which, and more likely everything here is going to be like a layer three or an ATM switch or whatever the case may be. All right. You have data centers that we have here. And depending on what here you see Metro E, Metro Ethernet, so you know that 10 gigabits per second is going one way and going the other you see redundancy, all right, have links to everywhere. So all these things play a part in your design in the network.

You just don't throw a bunch of switches out there. And I'll give you the examples. The examples I've been using for the past 200 years. Okay. I've done a lot of work in school. Schools for whatever reason, do not believe in VLANs.

They just don't. Okay, all these the ones that I've been to, okay. And they do not segment logically their network. Well, what does that tell you? That is telling you that everybody's part of the default villain of VLAN a villain. There's no villains in this in this movie VLANs Okay, is one, do your native VLAN number one is a security risk because, you know, Cisco says you need to change that, but say okay VLAN one.

Now we're all part of the same VLAN what's gonna happen? Everybody's gonna be in a huge broadcast domain. Yes. Is is the collision domains going to be affected? No, you're gonna create more collision domain more collision domains, meaning smaller, that's a good thing. You're still gonna have one huge broadcast domain.

So you're not helping problem by doing that. All right, so you need to see the bigger picture. Okay? I want to connect from here to there, what will be the best way? How can I minimize the amount of traffic this particular segment without affecting this one? As an engineer, a network engineer, okay, you went to school and took that title or you took your CCNA, or now your CCNP, or you're a CCIE, or you're an architect, the pinnacle of the pyramid, right?

You need to really understand how the equipment works, how the routing protocols or protocols that we'll use for redundancy or what have you, okay, or totals that we're creating, or they're actually creating a problem? Are we minimizing the amount of traffic that's going through this wire? Or are we actually creating a burden on this particular path? That's going to slow down our traffic. So monitoring is also going to come To place all these things we're going to talk about, okay, we're going to talk about as well, but in this particular section, they just want you to focus on these blocks. And it all here somewhere it says it somewhere.

Well, I guess it doesn't it. Okay. You have large buildings, medium buildings, small buildings, and you see the smaller buildings you have because this is the Cisco three layer or two layer model comes in the collapse architecture. You have the core, which is really up here. Then you have your distribution routers, but you have more than one core of a core here. You have a core here.

Alright, and there's a block on here. I wasn't crazy. There it is right there. You have a servers block right here is one particular block designed to do one thing, one segment, really think of this as segments. Okay. Now, again, I didn't draw this picture.

I'm trying to make sense of it for you. That basically what they want you to look at, here's another service block right here is segmentation. And we've always said that we've known that ever since the CCNA. segmentation is crucial to an Whether it's logical or physical, okay, if you're gonna do physical segmentation and logical segmentation, plus have redundancy, making sure these layered, let's say within the Cisco have two or three layer model, depending on the size of the network you're in. Alright? It's going to make traffic flow more efficient.

And then you'll be able to scale your network to something bigger. If you're in business, you don't want to have your a bottleneck somewhere in this information that has to get to over here. You don't want it to be slow down. All right, you want to be able to transfer information very smoothly without as least of interference as long as possible. Imagine in New York, the stock market network, they can't afford for that to go down. People will lose millions, if not billions of dollars.

If that goes down, that network slows down if they don't get the right information at the right time, how they're going to sell or they're going to buy, we don't know, because their numbers are not there. So we're going to learn, Okay, how about not settle maybe something this huge, but start understanding the concepts of how to really use layer two switching layer three switching or multi layer switching. All right, how are we going to use that to our benefit so we can have a redundant and more scalable and efficient network. I'll see you in the next one.