In this video we're going to take a couple of minutes and talk about various Network Models. We'll talk about the evolution of most company's networks and how if properly planned, these Network Models can lend a lot of redundancy and a lot of flexibility to your overall network design. So let's say you're going to start a small company and you're going to sell paper products and it's just you and maybe your significant other, your spouse and your kids. So you get an Internet connection, get one of those little wireless routers from Best Buy or wherever and you hook it up to a switch and that's plenty of network connectivity for the five or six users that you may have on your network there. Well as time goes on, you'll add an accounting department and they need their own switch because there's more people in that department and then okay, we're going to add more people into accounting. So we go buy another switch for the accounting department and then we've got the manufacturing floor out back and they need their own switch because they've got some computers back there to do inventory and maybe some process control equipment or some other things like that. And then you've got your sales division that also sits back there in the warehouse for whatever reason, because you know they're hardly ever there or whatever, they're always out selling and so as you can see, this network just kind of organically grows. Now just to be quite blunt, Cisco really doesn't have any networking equipment that meets this particular Network Model for the small business. I mean, let's face it, Cisco is an enterprise networking vendor, they provide networking equipment to large Fortune 500 companies and other larger companies, they don't really have equipment for a 30 or 50 user network, at least, not under the Cisco brand. Now they do have equipment that they've manufactured for that and they bought Linksys in order to meet that demand. But let's face it, the types of switches you'll get, from, you know again Staples or Best Buy or any of the local retailers, they're not going to be Managed Switches in most cases. So if you go and you do something like this, where you accidentally bridge the sales department back over to accounting, because well hey there's this cable here and it's not plugged in. Well let's plug it in, well you don't have many switches, now you've just made a big loop in your network and all the packets just go round and round and round in your network and you're network comes to it's knees and you don't really know why. Now I'm not saying that doesn't happen in enterprise networks, I think it's happened a couple of times on, on some large networks that I've seen but the long and short of it is, that this particular Network Model is not really the focus of the CCNP Certification. Now you will run across networks like this, especially when you first start out with networking and so I only present it as a valid Network Model and I kind of refer to this as an Organic Network Model. It's just kind of grown based around the needs of the business, there's not really been much planning or forethought or anything put into this network. Hey we need more ports here, let's just go buy another switch and plug it in to our existing switch and now we've got more ports. Cisco's model is what they call the Hierarchical Model and if you've learned the CCNA material anytime in the past five or six years, this is the Network Model that Cisco has taught you. You have a Core Layer of switches where everything is fast and redundant all in the core. You have Distribution Layer Switches that connect to your various Access Layer Switches and this down here is where your users will end up connecting to the network. They also have what they call a Collapsed Core Model which basically combines this Core and Distribution Layer into a single layer and from there you connect your users directly into your Core Network. And you see over here on the other side of the core you have data centering your WAN. This was Cisco's model up to just about a year and a half, two years ago. Cisco's new Network Model is called the Campus Model and you'll notice that the main difference between this and the traditional three tier Network Model is that each of these locations are in their own little block per se. You notice that each of these little blocks have their own Distribution Layer Switches and then they connect to the Access Layer Switches here. So this could be your Voice Over IP System, this could be your users in your corporate office, this could be the users in a different building. There's your WAN link, there's your data center and they're all these little individual blocks and these Distribution Layers, which just connect directly to the Multi Node Campus Core. Now there's no physical delineation for any of those blocks that you see there, each of those blocks could be a department, it could be a floor in a building, it could be four or five buildings in a metropolitan area. So as you see, you get a lot of flexibility using this Block Model if you will, it's because those blocks can be anything. It could be a server farm, it could be a DMZ, it could be a WAN connection. It could be an Internet connection, just so long as they have those connections back to the Campus Core and this core network that you see right in the middle, is where all of the high speed Layer 3 switching takes place. Now there are some new Cisco Best Practices and Cisco recommendations that come with this new Campus Model and we'll go over those in the next video.
|Course:||Implementing Cisco IP Switched Networks (642-813 SWITCH)|
|Duration:||8.5 hrs / 102 lessons|
|Captions:||Available on CD and Online University|
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