In the last lecture we discussed about both topology and star topology.
Now, let us see about ring topology in this type of topology, each computer is directly connected
to the other computers within the same network.
Now, as you can see on the screen, the networks data flows from computer to computer, back to the
source.
The ring topology has a lot in common with the topology because if you want to add a network, you have
no choice but to break the cable ring, which is likely to bring down the entire network.
This is one big reason that ring topology isn't very popular.
You just won't run into a lot as I did in the 1980s and early 1990s, where this type of topology was
popular.
It's also pricey because you need to several cables to connect each computer.
It's really hard to reconfigure.
Now, let's say there are 50 pieces in the ring topology, and if you want to add a new piece, you
just have to cut one cable.
And that is why it would require a lot of time and that would bring down the entire topology.
But even with that all being said, if you work at an Internet service provider that is ISP, you may
still find a physical ring topology in use for the technology called Sonnett or some other one technology.
However, you just won't find any local area network having a physical rings anymore.
Also, since one computer goes down, ring topology is easier to troubleshoot, but as I said, it provides
less fault tolerance because if one of the pieces goes down, the entire network goes down.
Next ahead is Mr..
Now, in this type of topology, you will find that there is a part from every machine to every other
one in the network.
That's a lot of connections, in fact, I can tell you that the methodology can win the prize for most
physical connections per device.
You will never find a missed apology in local area networks anyway.
If ever these days, but you will find a modified version of it known as the hybrid apology used in
the wide area networks, including the Internet.
Now, often hybrid mesh topologies will have quite a few connections between certain places to create
redundancy.
As you can see on the screen, there are four computers and all of all computers have their wires connected
to other remaining three computers.
Now, from this weekend, some of a formula for each and locations or and hosts you can have and in
duplicate and minus one upon two connections.
In our case, there are four hosts.
So let us put the value and is equal to four in the equation and we can get that four into Blackgate
four minus one upon two.
That is six connections.
And you can see on the screen that there are six wires in total.
In methodology, there are a lot of connections, as I said, if there are 50 computers, then 15 to
bracket 50 minus one of one two.
That is a lot of connections.
Next, since there are a lot of connections, we required more number of wires and it's a pricey topology
to install, and that is why mesh topology is not a common topology.
But if one computer fails, we can troubleshoot it quickly because that computer's cables will fail
and we'll get to know that this PC is not working.
But apart from all of the advantages and disadvantages, we can see that mesh topology provides a robust
for tolerance.
Even if one PC fails, the remaining network can communicate with other PCs.
Whereas in the case of ring topology, if one PC fails, the entire network goes down.
And that is why Mesh Toppo hybrid mesh topology is preferred these days in the Internet.
In the next lecture will talk about another two types of topologies, which is point-to-point, topology
and point to multipoint topology.
Also, we will see how to select the right topology based on five to six factors, which I will be determining
in the next lecture.
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