CompTIA Network+ (2009 Objectives) Tutorials
IP Routing / Understanding Routing
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Subtitles of the Movie (CompTIA Network+ (2009 Objectives) / IP Routing / Understanding Routing)
The concept of IP Routing or Traffic Routing if you will, is fundamental to TCP/IP and how networking works, and so you're going to see some questions about Routing on the Network+ Exam, and you're going to learn a lot more about Routing as you get deeper and deeper into your career. But in this video, that I've cleverly entitled Understanding Routing, I want to talk about what Routing is, and just help you get a grasp, on first of all, what it does, and why we need it, and then we'll delve a little deeper in some other videos. First of all, the best way to describe Routing is just the process of transferring or moving data from one network to another network. Now why do we need to do this? Well let's take a look at a very, very simple network, and talk about some issues that are going to come up. Now we have either PC's here on a network. Now if we have eight PC's all connected together, and let's just say, that all of these were connected by hubs, if we had a hub here, and a hub here, and everybody talked, the broadcasts that happen, the redundancy of every computer grabbing packets to see, is this packet for me, and on and on and on, is really going to start to eat up bandwidth. And if you go back and if, don't know what order you're watching these videos in, but when we've talked about collisions on the network, and how that works, you can see that the network will really start to get congested, just like the Freeway does around seven thirty, eight o'clock every morning. Well in our network here, we are going to put a router at a point, and connect these four computers to the router, and we're going to do the same thing on the other side of the network, and then connect the routers with usually what we would refer to, as a backbone, or a main link, or whatever. Now why do we this? Because now, the traffic between these four computers, stays on this side of the router, broadcasts from these computers, depending on how a router is configured, and we can always configure our routers however we want them to be, but broadcasts over here, stay over here. They never go over here to this side. Same thing for this. So what we've done, we have segregated this traffic amongst these four PCs, to this little neighborhood over here, and we've segmented this traffic to this neighborhood. Now when someone here, say this computer, needs to contact this computer, it needs to trade data with him, the routers then identify hey this guys trying to send to an IP Address that's on a separate network. So let me forward these packets, from this computer, over to this other network, and let's find the destination machine over there. And so by using Routers in our network, we're saying only necessary traffic goes over here OK? So this prevents undue congestion. Now we do routing every morning on our roads and our Freeways in a very simple way, but that is, on our Freeways, one side of the Freeway goes North, and the other side comes South. What would be happening if people going both directions were on the same side? It would be, number one, dangerous, and it would be very hard to make any real head way OK? So routing basically does the same thing. Routing says OK, I'm going to keep you moving here, and we're only going to go this way when we need to, and I'm going to segregate this, and we're only going to go this way when we need to. Now traffic can pass both ways, so my analogy breaks down, but all of this traffic, stays over here, that needs to be here, and all of it stays over here, that needs to be over here. Now I'm beating a dead horse here, I know, but I want to make sure you understand that the Routers, simply keep the traffic segregated to the little communities that it needs to be working in, and no traffic travels between the two routed groups, except what needs to travel. This really helps with a lot of things like security, utilization on the network, congestion, all that sort of stuff, so that's what routing is, and that's why we need it on our networks.
Tutorial Information
| Course: | CompTIA Network+ (2009 Objectives) |
| Author: | Mark Long |
| SKU: | 34216 |
| ISBN: | 1-936334-90-9 |
| Release Date: | 2011-04-29 |
| Duration: | 6 hrs / 91 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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