WEBVTT 00:00.680 --> 00:06.650 Terms like in and land should be in my opinion pretty straightforward for people who are approaching 00:06.950 --> 00:08.370 the security plus exam. 00:08.370 --> 00:14.600 However there are lots of network topology concepts that are on the test. 00:14.600 --> 00:19.970 So what I'd like to do in this episode is just take a few minutes and I use the word review if it's 00:19.970 --> 00:20.800 new to you. 00:20.810 --> 00:24.960 You get to learn something but the different types of network topologies. 00:24.980 --> 00:32.300 Now before we get started Make sure you understand that a network topology is basically the actual organization 00:32.390 --> 00:38.960 of a network in terms of how is the data moving around and the best way to get started with this is 00:38.960 --> 00:45.220 to begin with the most basic of typologies the local area network or Lan as you see in this diagram 00:45.230 --> 00:52.040 what we have is a number of computers and all of these computers are connected together to one box called 00:52.070 --> 00:52.970 a switch. 00:52.970 --> 00:55.130 Now keep in mind it doesnt have to be one switch. 00:55.130 --> 00:59.900 There could be two or three switches and it doesnt have to be just a few computers it could literally 00:59.900 --> 01:01.970 be hundreds and hundreds of computers. 01:02.180 --> 01:08.150 But what's important is we look at this is that all of these computers are connected into what we call 01:08.180 --> 01:10.130 a broadcast domain. 01:10.130 --> 01:16.070 Now when I say a broadcast domain all I'm saying is that if an individual computer sends out a broadcast 01:16.550 --> 01:22.150 all of the other computers that hear that broadcast are members of the broadcast domain. 01:22.160 --> 01:26.680 So that is a classic local area network. 01:26.690 --> 01:33.590 Now what we can do here is we can extend that Lan let's say for example we take that one land and break 01:33.590 --> 01:36.920 it up into two three four five six different lands. 01:37.130 --> 01:44.390 We interconnect these with one or more routers to generate what we call a wide area network or a way 01:44.390 --> 01:46.680 in a wide area network. 01:46.700 --> 01:47.900 Absolutely. 01:48.080 --> 01:52.430 Have at least two local area networks and at least one router. 01:52.430 --> 01:55.580 However we can scale this up if we want to. 01:55.590 --> 02:02.290 Now imagine all of the different wide area networks that are in the Houston Texas area. 02:02.330 --> 02:08.150 So if we scale this up here's Houston Now that said we've got all of these wide area networks that are 02:08.150 --> 02:14.510 within Houston and even these wide area networks can connect together to create what we call a metropolitan 02:14.510 --> 02:15.760 area network. 02:15.770 --> 02:20.900 Now you've got to be careful here that metropolitan area network is also a wide area network a wide 02:20.900 --> 02:25.030 area network that connects to other wide area networks is still a wide area network. 02:25.090 --> 02:29.160 What makes it a metropolitan area network is that it spans a city. 02:29.190 --> 02:31.760 Now you could have a lot of variations of this. 02:31.760 --> 02:40.550 You can have campus wide networks you can have county networks so the geographical space just gives 02:40.550 --> 02:43.640 you an idea where the interconnections are taking place. 02:43.670 --> 02:45.980 In fact let's scale this up even more. 02:46.100 --> 02:50.480 Now I know some you folks aren't in the US but here's the continental United States. 02:50.540 --> 02:56.420 And let's scale up all of these weapons all over the United States and then start to connect these guys 02:56.420 --> 02:57.090 together. 02:57.380 --> 03:00.840 What we've generated down folks is the Internet. 03:00.860 --> 03:06.170 And I guess I should extend this worldwide now and even in into outer space the International Space 03:06.170 --> 03:09.170 Station they have a really good Internet connection as well. 03:09.170 --> 03:15.350 So what you're doing is you just keep connecting winds and connecting winds and connecting winds until 03:15.350 --> 03:21.780 you completely cover the entire world and you get the Internet now there's a little more to it than 03:21.780 --> 03:22.440 that. 03:22.440 --> 03:29.160 The other thing you got to keep in mind is that the protocol which runs the Internet is TCAP IP TCAP 03:29.160 --> 03:37.350 IP is free it's extremely well-known and anybody can use TZP IP even if you're not on the internet as 03:37.350 --> 03:42.440 long as you're using legitimate IP addresses like Piers IPV fortress. 03:42.540 --> 03:50.250 Or how about an IP V-6 address if you're using the TCAP IP stack and you're making your own way in or 03:50.250 --> 03:52.060 when or whatever you want. 03:52.170 --> 03:55.300 You are now creating the intra net. 03:55.590 --> 04:03.950 So an intra net is nothing more than a private network which still runs on TCAP IP. 04:03.960 --> 04:11.090 Now we can take this one step further and here is my internet but way out somewhere I've got. 04:11.100 --> 04:16.070 In this case some vendor who needs access to my databases or something like this. 04:16.140 --> 04:23.760 So I give that vendor a Internet connection into my network so that they can do whatever they need to 04:23.760 --> 04:24.200 do. 04:24.270 --> 04:27.550 And that's a great example of an extra net. 04:27.570 --> 04:33.870 Now again hopefully for most you guys this is very much a review episode but do keep in mind on the 04:33.870 --> 04:37.230 security plus it will throw these terms out hot and fast. 04:37.230 --> 04:41.580 These are not the types of things you want to stall on when you're going through some challenging security 04:41.580 --> 04:42.510 plus questions 04:45.930 --> 04:50.050 on.