In this last lecture of network topologies, we are going to see two different types of topologies that
is point-to-point apology and point to multipoint apology.
So let us see what is Point-to-point apology?
You can see the image on the left hand side of the screen.
Just focus on that for a few couple of minutes.
Now, as its name implies, in a Point-to-point apology, you have a direct connection between two routers
or switches, giving you one communication part the routers in a point-to-point.
Topology can be linked by a series of cable, making it a physical network or if they are located far
apart and connected only by a circuit within a frame.
Really, it's a logical network and still not a figure on the screen.
Illustrates three examples of typical P1 or wide area network point to point connection.
What you see in the first part is a lightning bolt and a couple of round things that a bunch of arrows
projecting from them, right?
Well, the two round things, radiating arrows represent our networks to routers.
And that lightning bolt represents a van link.
Now, these symbols are industry standard, and I'll be using them throughout this course, so it's
a good idea to get used to them.
OK, so part two of the diagram on the left hand side shows two computers connected by a cable, a point
to point link.
Now, by the way, this should remind you of something we just went to do.
Remember peer to peer networks that we have seen in earlier of this section.
I hope you remember that good.
Now, I hope you also remember that a big drawback to Peer-to-peer network sharing is that it's not
very scalable.
Now, with this thing in mind, you probably won't be at all surprised that even if both these machines
have a wireless point-to-point connection, this network still won't be scalable.
You'll usually find Point-to-point networks within many of today's wide area networks, and as you can
see in the part three of the diagram on the left hand side, a link from a computer to a hub or a switch
is also a valid point to point connection.
A common version of this setup consists of a direct wireless link between two wireless bridges.
Now, just focus on the figure that is on the right hand side of the screen, that is point to point,
that is point to multipoint topology, again, as a name suggests, a point to multipoint topology consists
of a succession of connections between an interface on one router and multiple destinations around one
point of connection to multiple points of connection.
Now, each of the routers and every one of the interfaces involved in the Point-to-point connection
are part of the same network.
The figure on the right hand side shows a wide area network and demonstrates a point to multipoint network.
You clearly see a cable corporate router connecting to multiple routers of the branch offices.
That and the figure on the left hand side are the two different types of topologies that you need to
remember.
Now, a hybrid topology is a topology that is a combination of two or more physical or logical network
topologies working together within the same network.
Now, how to select the right topology.
Now you can just ask the question, well, we are just connecting cables between two hosts, so why
do we need to actually think of at this point wrong?
Regardless of the type of the network you build, you need to start thinking about the quality at the
bottom and work up.
Now, I will give you a real live example and make sure you listen to it.
Think of it as if you were at an electronics store buying the cable for your home theater system.
You have already spent a bunch of time and money getting the right components to meet your needs.
Because you've probably partied with a hefty chunk of change, you might be tempted to cut corners,
but why would you stop now and collect all your high quality devices together with the cable equivalent
of Doyne?
No, you are smarter than that.
You know that picking out the exact cable that will maximize the sound and the picture quality of the
specific components can also protect them, right?
It is the same thing when you're faced with selecting the physical media for a specific network.
As you know, not only you have a buffet of network topologies to choose from, but each one has its
pros and cons before implementing it, but it really comes down to that well-known advantage.
Ask the right questions.
How much cash do you have?
How much fault tolerance and security you really need?
Also, is this network likely to grow like a weed that you need to quickly and easily reconfigure often?
In other words, how scalable does your network need to be?
For instance, if your challenge is to design a nice, cost effective solution that involves only a
few computers in the room, getting a wireless access point and some wireless network cards is definitely
your best way to go because you won't need to part with the cash for a bunch of cabling.
And that's super easy to set up.
Now, let's say if you hired a person to design a network for an Internet service provider running at
ninety nine point nine percent of the time, you need a Godzilla strength for tolerance.
So your primary solution is to either go with a hybrid or a partial apology.
Now, again, remember that in enmeshed topology, there are a subset of them into bracket and minus
two connections.
So, again, if you implement mesh topology, the cost would also go up.
So here's a list of things to keep in mind when you're faced with coming up with the right topology
for the right network.
First question is to ask, what is the cost of the installation?
What is your budget?
Do you have enough amount of money in your pocket to spend?
The next question is ease of installation.
Check the room, check the network size before selecting the topology.
The next is ease of maintenance.
Are you going to select topology that is difficult to maintain?
Absolutely not.
We are going to select the topology that is a whole lot easier to maintain.
The fourth question that you need to ask is, what is the fault tolerance of the topology?
Now, if you have around 10 to 15 computers and you select ring topology, then that's a bad call.
Ring topology provides the least for tolerance.
So before selecting the right topology, you need to ask the question of fault tolerance.
And finally, security requirements.
Now, these five factors you should always consider before you select the right topology for your network.
That's it, folks.
This is all for the network topologies.
And I hope you are learning a great content from this course.