Hey everybody welcome to the next video.
So in this video are we going over networking.
This is gonna be a high level overview of what networking is in a nutshell.
And then we're going to dive a little deeper in different parts.
Now what is networking.
Networking is the connection of computers to share some sort of resource.
Now whether that's a Web site file sharing just transfer data whatever the case might be it's to share
resources.
Now the internet is based and powered by networks.
So just the internet is just a compilation of networks from different spots in the world that are all
sharing resources.
Commonly you'll hear network people refer to it as an end point or a node.
It entirely depends on who you're talking to.
But in general cases we're going to refer to it as a node.
Now what travels over a network is a packet now a packet is a set size.
Most of the time depending on the protocol used as a set size of data that is transferred over a physical
medium which is the the wire the physical wire that runs from the computer or the Wi-Fi or whatever
the case might be it's some sort of medium to another note on the network.
Now commonly DCP IP and UDP use this type of structure the packet but most other protocols that you're
going to use inside of DCP or or I'm sorry.
On top of TCB or on on top of UDP are going to use a packet as well does a basic understanding what
a packet is.
We'll dive a little bit more into that in future videos.
Now the networking medium here are just a few common.
We have UDP or until the twisted pair and then we have SVP for shield the twisted pair.
Now what you're pop commonly going to be running into at least from a home network standpoint or maybe
in a networking closet you're going to see unsheltered twisted pair.
Now what happens between shielded and unsheltered is the wrapping around the wires itself to help avoid
any disturbance in the wire itself.
Now I'm not going to go too much in detail of how twisted pair it looks like there's a lot of tutorials
out there to show you how to make your own twisted pair the shielded parts a little bit different because
you have to have that that ring around it.
However I'll leave that to you guys to look a little bit more detail.
Now the coaxial cable is probably what's going to be most familiar with as far as what you see on a
daily basis you're going to see when your modem is connected to the wall a big cable with a giant spike
through the middle that goes in the wall.
You have to turn for 20 years.
That's a coaxial cable.
Now again I'll leave that specific types of cable and what they do for you guys for homework and then
at an enterprise level you're going to be dealing with fibre which is made of light.
So again look at that look that up there's multiple different types of connectors for fibre cables.
There's two types of fibre cables but just understand that it's it's commonly used as a backbone or
the base line of the network is normally a fibre connection because it can go much longer distances.
What I also want you to understand is for each cable the different types of cable have different lengths
so you can only go so far on a shielded and shielded twisted pair cable before the data needs some sort
of repeater in the middle to boost the power again and have it send the full signal fibre on this station
go much farther than any of the other three.
So it's important to understand that from a networking perspective as far as a red timer is concerned
you won't need to deal with this too much unless you start getting into fibre taps or any type of wire
tap which you might do.
So just keep that in mind ahead of time.
Now RFID now in RF C is a request for comment.
This is some sort of publication.
Normally this is about a protocol or an algorithm or any type of document that needs to be standardised.
Now this fully defines the type of technology and what it does.
So if you want to look up if you want to google HDP one point one RF C you're going to find a gigantic
document of exactly how HDTV works and what how it's structured and how everything has the same thing.
IP has the same thing.
So you can go and look up an R of C I want you to understand what RF RFID are now.
You're very rarely find yourself going through and reading the whole thing.
You might be looking for a specific thing like you don't know how to interface with a particular protocol.
So maybe you need to look at the RNC to identify that.
Just keep that in mind what an autopsy is because you'll see that that term thrown around a lot.
Is there an RF C for it.
Is there not.
So it's a good place to look up information when you want to get really low detailing exactly how everything
works now as far as networks go.
There are a few network top holidays now a top apology is a structure of the network.
So what it how it functions as a whole and how it how it looks like.
So there's a few there's bus rings star mesh and hybrid.
Now we're going to go over each one of these in a second.
Now on a bus topology you can see we have the one line going to the middle.
Now that one line going through the middle you can think of that as your backbone or your fiber and
then everybody else connects into that wire and the nodes in this case are whether it's a server or
a workstation it doesn't matter.
But I won't show and said that a bus looks similar like a bus it's a straight line and it's got nodes
on each side now it's commonly used on the back end.
Each one of those notes would normally be like a router or a networking closet or some sort of things
like that.
Now a ring also known as the token ring.
It looks like we got a stray line over here.
So a token ring is when everything connects to the next one in line and eventually makes it circle.
The problem with this is if one node drops the node before it can't reach to the other side so there's
limitations on each type of topology.
Which is why we'll go over some of the other more used ones but understand what what the ring topology
looks like.
Now Star is pretty similar.
They all connect into one sort of networking device.
However if that network device fails all of them are off line.
They can't talk to each other.
So that's why it's looking like a star now a mesh is getting into more of what we're used to on a regular
network.
Now keep in mind of mesh mesh is one of those things that where it is a combination of a few different
ones.
So you can have a backbone as well but you also see a star topology in here as well where things connect
into a networking device but you also see nodes that connect to other networking devices which is not
common in a star topology.
So it's kind of meshing some of them together.
And it's good to understand that mesh is more of what we commonly use but hybrid is again what we normally
use on a day to day basis.
Now I know the document here looks a little weird but bear with me here.
In this case everything connects to each other.
So there's always a path to it.
Now between mesh and hybrid is what our networks are commonly done today in the backbone of the network
going from like for example site to site or for example down the street for the Comcast fiber line or
Google Fiber.
They have the main line that goes down the street and then connects off to think of these nodes as houses
so hybrid and mesh kind of you combine those two together and you have a structure of what our network
sort of looks like now.
Now you can design the network however you want but in most cases you're going to see a mesh of switches
that handle certain amount of hosts and those switches are attached to a cabinet which is on a backbone.