Skill Level Beginner
- One thing on the Network+ is the ongoing, perpetual pounding of all the different types of networks. LAN, WAN, WLAN, PAN, MAN. Let's take a minute and just get this all squared away, okay? So, the best place to start is right here. So what I have is one switch with some computers hooked to it. They can all ping each other, they are all on the same broadcast domain. This is a Local Area Network. I don't care how many more switches I add as long as everybody is on the same broadcast domain I am on a LAN.
Now the moment I come in and add a router and this connects to another LAN somewhere, I am now on a WAN. A Wide Area Network. You can't have a WAN without a wouta. (laughs) Okay I'll keep my day job. Anyway, so now we now what a LAN and a WAN is. Let's take this up a step. So here is a building. And inside this building is a whole bunch of LANs and they're interconnected together and so I have a big WAN in this building.
Now let's say I have a campus and there are interconnections between these buildings. We're going to call this a Campus Area Network or a CAN. Ready to take it up a step? So now what if I've got a metro area? Like this is Houston, Texas and I've got the city of Houston and the city of Houston has their own little network and it interconnects all these different buildings together. This is what we're going to call a Metropolitan Area Network.
Now what if I take it one more step? And now I've got two cities and I interconnect these cities together. Now what I have is, well, if I connect cities like Hong Kong and Topeka, Kansas and London and Johannesburg, that's the Internet folks. So, now we have to be careful here. If you have your own private network, that is what we're going to be calling an Intranet, okay? But if you're talking about the big wide open, big thing, that is the Internet.
So we've got those figured out? Good. 'Cause we're not done yet. Let's talk about wireless for a minute. Here's a wireless access point and here's some wireless clients. Now unless I make some limitation on the wireless access point itself, all of these guys are on the same broadcast domain. They can ping each other, they can see each other. This is a WLAN or a Wireless Local Area Network. In fact if I wanted to, I could add a couple more wireless access points as long as they're on the same SSID, plugged into the same switch, have more clients, that's still a WLAN.
In fact, I could add more SSIDs if I wanted to as long as we don't put any routers in this, this is all one big WLAN or Wireless LAN. Got it? Good. We're still not done. I'm not gonna throw a nice Wireless Access Point. Let's talk about Bluetooth for a minute. If I have two Bluetooth devices and I want to share data between these two, I'm going to be setting up a Personal Area Network or a PAN and I'll set them up and pair them up and do what I need to do.
So if we have Bluetooth devices, we use PAN. Got it? (laughs) Good 'cause this time I'm done. Make sure on the Network+ you're comfortable with all of these different acronyms. The Network+ throws them all over the exam and you really should know them anyway. See you on the PAN, WAN, LAN, MAN or whatever the heck you got.