Time
60 hours 39 minutes
Difficulty
Beginner
CEU/CPE
61

Video Description

Network Topologies: Star This lesson covers star topology. In star topology, all components connect to a central hub which manages all the data connections. Advantages of star topology include it being easy to set up and expand. Star topology also offers ease in troubleshooting. However, a disadvantage of star topology is that is has a single point of failure; there is no other fallback method for the devices to communicate with each other.

Video Transcription

00:04
Now, our next apology is going to be our star topology and our start apology. We call it that because it looks quite like a star. We have one central what we call hub device that manages data connections, and then it connects to all of our different nodes. Now, our start apology.
00:22
We call this our central hub device.
00:25
But our central hub device doesn't have to be a actual on actual hub. It could be a switch or it could be a hub. We just call it a hub device because, ah, hub is another name for just a place where you have a lot of different connections coming into, um,
00:42
but are different. So our different hubs could be smart or dumb. If we're actually using a networking hub than a networking hub, is going to take all the data connections it receives and then send them out to everyone. So even if
00:58
and will mark our computers again real quick,
01:00
even a computer a is just trying to send to computer D. A dumb hub would take the data and then send it to computers. B, C and D. It doesn't look at the packet at all. It doesn't look at the destination. It just sends it.
01:14
A smart hub would be like a switch, which is actually what we have here, indicated by our
01:19
very crudely drawn Arabs, where a switch will after it's been in operations for a few seconds will say, Okay, A is connected to this physical port B is this physical port? See, is this physical port India's this physical port
01:34
and then A is sending a packet specifically for D, and so then our switch will send it specifically to deep.
01:42
So are our start apologies air Good. Because they give us better traffic handling. They're easier to set up and expand, and they're easier to troubleshoot. We say they have better traffic handling because rather than having the data sent to every single node,
01:57
if we set up a smart, smart device like a switch in the center of our start apology,
02:02
then our switch is going to send that data out a little bit better. We're gonna have a smaller collision domain. We don't have an entire bus with every computer broadcasting out. We don't have a ring topology where we have to wait our turn to send the date unnecessarily. We just send our data to that center switch,
02:22
so there's better traffic handling. It's easier to set up an easier to expand because really, all we need is to buy. We could just buy and out of the box switch and then start plugging our computers into it. And if it's easier to expand, because if we bought a switch with more ports than we have computers, all we have to do is plug more computers into the ports,
02:42
so it's very easy to set up
02:44
even just out of the box. It's very easy to expand, so it's It's great for small, small home, small business type environments
02:53
now the, uh down and it's easier to troubleshoot because if we have all of our nodes air down, there's probably a problem with our switch. Or if just one of our note can't nose can't communicate, there's probably a problem with the port or the device.
03:06
Now are downsides of our our start apology. Our main downside is going to be our single point of failure
03:15
now, unlike our bust apology or are one ring topology, not every note is a single point of failure, but our sinner device is our single point of failure.
03:27
If this switch gets unplugged or gets turned off, then there's no other way for our devices to communicate. There's no other fail fall back fall back method for these devices to communicate with each other. So there is a single point of failure
03:42
and really that that's our main drawback of this particular set up. If we actually have a dumb hub as our center device, then our other drawback would be that it sends data to everyone, and that could be a security risk. But
03:57
if we're using a switch, then that's mitigated because we can use our switch
04:00
in our switch will only send to a particular destination we could set up
04:05
are different the lands we could set up some of our different. We could set up how we want our network actually set up so our switch can help seriously mitigate, ah, lot of the even the security risks that we talked about with our other type of apologies. So, even for a small home small business up to a large enterprise environment
04:27
switches are great solutions because of
04:29
the easy set up, the easy management and all the additional expense ability that they provide. But do keep in mind, though, they have our single point of failure unless we mitigate that through another means.

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Instructed By

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Anthony Harris
Systems Analyst and Administrator at SAIC
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