WLAN Topologies Now, in this module, we’re going to take a look at some of the different types of topologies we can have with the wireless local area network. So that means we’ll look at those topologies and talk about some of the eight or 211 options that we have and the 800 and 211 configuration modes that we have both for clients and for an access point. Wireless Networking Topologies So when we talk about wireless networking topologies so far, we’ve really only talked about what we would call…

Wireless ISP: Last-Mile Data Delivery One of the terms you might hear often from any service provider, whether it’s for your internet service provider or your wide area network, which is a private line. It’s a term called last mile. And what that is, it’s a term called by the phone company. And by the way, yes, most of our wide area networks started with phone companies or cable companies. And so from their edge of the their network, that wire to your building was called the last mile. And…

WLAN Deployment This module is going to be about the wireless lan deployment. So we’re going to take a look at some of the common considerations that we should look at for the types of different wireless lan networks. And one of the big things we always have to ask in network engineering is what applications are we trying to support? So we’re going to talk about the different applications, the different devices, talk about data access, voice access, network extension to remote areas, which might include building to building…

WLAN Controller Part1 So the heart of centralized wireless lan architecture is that wireless lan controller. And as I said, it’s just basically that central point for data aggregation. All the people that are connecting, it looks like I broke that laptop. Everybody is connecting their data is going to go to that wireless lan controller and then come out on that wired network and the encryption is handled there everything. It just really offloads the work that the access point has to do. So the access point can just…

WLAN Architecture In this module, we’re going to take a look at the wireless lan architecture. So that means we’re going to take a look at client devices, the different ways we can connect them, talk about things like the wireless lan controller when it gets into some of those specialty wireless lan infrastructure designs that we can make. Management, Control, and Data Planes So in the world of networking in general, not just even telecommunication, we have three logical planes of operation. The first is the management plane. Okay?…

SIFS/DIFS Part2 So when a client transmits a unicast frame, the duration ID field is going to have a value from zero to 32 767. And that really represents the amount of time in microseconds that’s going to be required to transmit an active frame exchange process. And doing that, the other radios are not going to try to interrupt. And again, remember, everybody’s hearing this because, you know it’s a WiFi medium and they all hear your radio signal. Carrier Sense Part1 Now, Carrier Sense, a part of the…

Wi -Fi Access Now in this module we’re going to talk about WiFi access and we’re going to make a couple of comparisons about how wireless is different than a wired. So we’re going to compare this idea of CSMA carrier sens multiple access with the WiFi using collision avoidance and with the wired using the collision detection. Then we’re going to get into some more acronyms which I’m sure all of you are waiting for. We’ll talk about the distribution distributed coordination function, the point coordinated function, the hybrid…

802.11ac Part7. Now, the 256 qam was a big upgrade, and that came with eight or 211 AC. It doesn’t mean everybody is using it or that they can use it. But, you know, we originally with a eight or 211 A, had the 64 qam, and that gave us this great 56 megabits per second for speed, you know, identified 64 unique different values. And if you broke it up into the little square with the each corner having the number of bits we can send, we were able…

Very High Throughput (VHT) Now in this module, we’re going to talk about what is now called very high throughput, which won’t be that in ten years from now, but anyway, it’s going to be the eight to eleven AC 2013 amendment. Now, this is a wifi that operates only at 5 ghz, but they can combine channels. Instead of having just 20 mhz, they can go 2040 8160. They change the way in which they do of the modulation to be able to send eight bits of data instead…

Wireless Attacks Part10 For whatever reason, we don’t hear a lot of people talk about denial of service. And you know what? Denial of service on radio frequency is the easiest thing you can do. I can go to any electronics store, buy a jammer, turn it on, and your wireless service is gone. It’s that easy. I mean, I want to keep people from getting out of the network. I can just, again, intentionally jam it. I could probably even do it with my laptop. If I get on…