Time
31 hours 29 minutes
Difficulty
Beginner
CEU/CPE
30

Video Description

Network Topologies: Point to Point and Point to Multipoint This lesson covers point to point and point to multipoint topologies. In point to point topology, one device is connected to another device. Point to point topology is sometimes referred to as on link. Point to multi point is when single point goes to multiple points and is used in multicasting. In point to point, things can from point A to point B. However, in multipoint, signals are sent to everyone who is connected. This can pose a security threat as it can allow for one user to sniff out the traffic that is happening on the hub.

Video Transcription

00:04
so when we're talking about are different. Networked apologies, another term that we need to understand. Another concept that will be examining is going to be point to point versus point to multi point now when we're talking about point to point connected. We were talking about connecting one device to one device,
00:21
and typically this this may be referred to sometimes is on link.
00:25
It's a single device to another single device. It may go through a switch or a router or bridge, but we're only connecting. We're sending data from one device point A to point B.
00:38
This is contrasted with 0.2 multi point point to multi point is a single point transmitting data that goes to multiple clients. Now we we sometimes use this in multicasting, where we intend to send data to multiple points using We send it to a multi cast address in it sent to multiple different computers. But
00:57
sometimes we don't
00:59
That's not really what we want to occur, but because of the way our network topology is, that's just what happens. Some of our networked apologies have sinned data to all the clients along the stream, so even if we're only trying to send toe one client. The date is going to go to everybody, so it will be a point to multi point.
01:18
So
01:19
let's take a look at our different network to pollen are two examples of a networked apology here.
01:23
Now we'll talk about our different network topology, definitions of our exact different types of apologies. But just know for now that we have right here, too. Simple, simple networked apologies with the central with a central hub hub type device.
01:44
Now we say, Ah, hub type device.
01:46
But really, this right here this device is actually a switch, and this device is a hub, and we'll see how they function differently in this point. The point versus our point. The multi point
01:56
now in our switch devices are switches are what we say as being smart are switches will, actually, after they've been in use. And after they've been hooked up in transmitting data, they'll make note of Mac addresses to actual port numbers are physical ports. So as we're using it
02:15
And if we wanted to send data from a computer a
02:19
over to server be then our data would only go from computer A over to server be so it would be a point to point connection.
02:28
Now we have our hub environment and in our hubs are hubs. Do not map. Mac addresses to physical ports are hubs. Just take data in from one port, and they'll send the data that they received to all the other devices that they're connected to, other than one other than the device that sent it.
02:46
So if Computer A is trying to send a compute message to computer be,
02:50
it's going to send the data down. And then the hub is just going to send the data up to the router to Computer B and two computer, our server B and two computer. See, It's going to send it to everyone that's connected to it. So it becomes like a point to multi point, because even though we're trying to just send data from one point to another,
03:08
is going to everybody
03:10
Now. This may suppose a security threat because if, say, the person who's on computer see just wants to start sniffing the traffic, they're going to see everything that's going on in our entire network because everything's going through that hub and everything that's going through that hub is passing along to them
03:28
now, even in our switched environment, we do have instances where we may have a point to multi point connection. This maybe if we're sending out a message to a multi cast address or if we're sending out a message on broadcast. So if we are sending out a broadcast message, say, for example, serve our computer, eh?
03:47
Just connected to our network and does not have an I. P address
03:51
and server be over here, performs D H C P. Then when computer A connects to our network is going to send out a D. H cp Discover message as a broadcast message. And this is going to be like a point to multi point of message because as soon as our switch receives that and sees that it's a broadcast message is going to send that to everybody.
04:11
Now, our router here isn't going to do anything with that broadcast message,
04:15
because, remember, Brown routers will not will not take broadcast messages and actually propagate those on so our router won't receive that broadcast message and send it on a router has to be
04:30
specifically lists are specifically named or the specific destination for our packets, but but just know that our broadcast or multicast messages would be like a point to multi point connection.
04:44
But our main distinction between these two environments is going to be our central device. Where is in our first environment, we have a switch in our second environment. We have a hub, and so our hub is typically always going to be a point to multi point connection.
04:57
As we start talking about, some of our other types of apologies will talk about apologies, like our bust apologies and our rink apologies. For example, our bust apology is several computers that are just connected on one main line. And then, if you send data down that line, every computer is going to see it
05:15
every computers. I want to read that
05:17
now on Lee, the computer that it's destined for will actually take the packet and use it. But if any other of those computers on our line are sniffing the traffic, they're going to see what's in that packet. So we need to be aware of our difference between our point, the point and our point to multi point and understand the implications of a point
05:38
of a point to point connection
05:40
being just one computer to another device and the implications of a point to multi point where some cases we may need point to multi point, but in other cases we may not want it because it may pose a security threat.

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