This video and the next five videos in this series
introduces the architecture,
structure, functions, components
and models of computer networks, the world wide web and the internet.
I'll briefly describe the use of OSI
and TCP layered models
to examine the nature and roles of protocols and services
at the application,
presentation, session, transport, network,
data link and physical layers.
Now I'm also going to be going through this in detail so you understand
all these terms because I've thrown a lot at you.
So I'm also going to describe the principles and structure of IP addressing
and the fundamentals of ethernet concepts, media and operations.
And I'll build a simple LAN topology
by applying basic principles of cabling
perform basic configurations of network devices,
including routers and switches and implementing IP addressing schemes.
So again, I've thrown a lot of jargon at you right there but stick with me for this video in the next
five and I'll do my best to explain it all in detail.
So specifically, in today's video
computer networking and the internet is a fascinating topic.
So come along with me while we journey through the layers of software and hardware
that make the internet and even local networks possible.
My name is Tim Buchalka from the Learn Programming Academy.
So using our smartphones, wearables, tablets and laptops,
you and I can easily access computing devices
and play games all around the world. So what makes this possible?
I'm going to show you how in this video.
Connecting computer devices together
much like putting logo pieces together to create something
allows us to interact with these devices no matter where they are physically located
to share information and resources,
both software and hardware are required to make this happen.
So let's look at some of the basic networking concepts to make all this possible.
First up, network classifications.
So a personal area network or PAN
is normally used for short-range device-to-device communications such as a few meters
or yards.
Bluetooth technology is a good example of this,
and it was originally conceived as a wireless alternative
to RS232 data cables that coupled keyboards
and pointing devices like a mouse to the computer.
Today this PAN technology is used for wireless keyboards, mice,
headphones, speakers, printers, gaming devices and more.
A local area network or LAN technology
is used to cover a wider range of space such as an entire office, university building
or computer lab,
where the distance between devices is greater than a few meters or yards.
Within a land, one can also find one or more PANs.
A metropolitan area network or MAN
uses technology that covers an even wider range of geography,
such as the local community or city.
The broadest geographical coverage possible spanning the globe
is called a wide area network or WAN. The internet is considered a WAN.
Two other network classifications can also be used to describe networks.
These classifications can be combined with the ones just mentioned
which further distinguishes the type of network.
The first of these two are networks that are often classified
as either open or closed.
An open network is one in which its internal operation is based on publicly
available designs,
mainly the TCP/IP protocol suite which I'll talk about more later.
The internet is a good example of an open network
because it's based on the public domain TCP/IP protocol suite.
Closed or proprietary networks
are based on technology inventions owned or controlled
by a particular entity, such as a person group or corporation.
Most closed networks have fallen out of favor in the 21st century
due to contracted licensing restrictions
to say nothing about the need to have technical expertise available
to maintain the proprietary network.
What we see today is the use of open network technology referred to as an intranet
that restricts entry and exit to from other networks.
The second of these other network classifications
is based on the topology or the pattern
in which the devices are connected.
The most popular topologies today are the bus and the star.
In a bus topology, all the devices are connected to a common
communication line called the bus.
In a start topology, one device serves a central focus point or hub
to which all the other devices are connected.
What's interesting about the star topology is that it dates back to the 1970s
when mainframe computers with dumb terminals connected,
evolved into the mainframe computer with personal computers connected to it.
A good example of the star topology today is a device called a router
for wireless connection to all our wireless devices in our home or office
to communicate with each other as well as allowing some of them to connect through the single point
called an access point or AP to the internet.
What's interesting about the bus topology
is that its routes date back to the 1990s
when it was implemented under a worldwide set of standards known as ethernet.
Ethernet is in fact still very popular
and implemented via wired cabling technology
with RJ45 plug connectors.
Cable TV in the united states and other countries is a major user of ethernet.
That's the basic of network classifications.
Protocols are the topic of my next video what's the most popular network protocol,
find it in the next video. Thanks for watching.
This is the part of the video where I meant to get all enthusiastic and to ask
you will quite literally beg you to subscribe to my channel and to like the
video leave a comment and all that stuff.
Well, I'm going to leave that decision in your capable hands
to decide whether I've earned a like or a subscriber or a comment.
I'd be grateful if you do one both or all three.
More videos will get out there in front of a bigger audience if I get that level of engagement
but obviously it's your choice.
So remember that this series was meant to be watched in order.
So if you haven't watched from the start, then how dare you watch my video series out of order.
Click the link over here to get to the first video in the series and watch that
if you want to see the entire series in order or come over here and click to view the previous
video in the series. Again, your choice.
All right. I'm done, catch you in the next video.