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Hey they're welcome back.
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All right if you thought so far
everything's been really really cool.
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Well, things are gonna get a lot cooler.
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We're going to be talking
about the Internet backbone.
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So we recognize this because I've been talking
about it for the last couple of lessons.
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But some of you may have had a question
that is what do the arrows mean.
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I mean it's kind of like magic right.
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I just told you that we send off the IP address to
the servers the server responds with some files but
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this is just magic like what do these arrows mean?
So, we're going to talk about that in this lesson.
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And we're going to do that with this really, really
fuzzy diagram that I found online from this website.
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It's not the clearest picture but it actually has
some really important things so I want to use that
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to demonstrate to you what
the Internet backbone is.
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So, as some of you know the way we connect in our homes,
at a coffee shop, or at work is we usually have
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Wi-Fi or you know maybe sometimes we still have people
they are using Ethernet cables
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and connecting through those.
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But for now let's just focus on the fact that we have
a home and we have Wi-Fi and this Wi-Fi essentially
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gives us Internet from the router.
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You can see this little person over here working hard
with a router next to him and this router is connected
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all the way to something called a modem.
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And this is something that if you ever sign up for
Internet or change providers you most likely had
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somebody come to your house
and install something.
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And that's this box over here that
essentially allows the ISP the Internet
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Service Provider,
this big building over here,
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we remember that, to connect to it.
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So this modem has the signal
towers that transmit signals of,
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you know Google.com and it receives these messages
and then this is why I picked this image just
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because I think it's incredible you see this wire
that is connected all the way to the ISP and then
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the Internet Service Provider, the ISP is connected to
this magical blue cable that is the Internet backbone
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and something that's really important in this image
is the fact that there's Wi-Fi which is over the
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air but at the end of the day everything
is kind of connected through cables.
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So some of you or many of you,
or all of you might be wondering
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"What the hell is this Internet
backbone thing?"
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Sounds cool. But this - this is kind of vague, so I found a
really, really cool - cool thing that we can do together
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I'll post this website in
the notes after this lesson.
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But if you go over here you actually see the Internet
backbone. So, let's say we're in Brazil and we want
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to search Google.com.
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Well from Brazil, from our home, through Wi-Fi, it
connects to our router, to our modem and then all the way
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to our Internet Service Provider lets say (the) Internet
service provider is over here and then, through
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cables it connects all the way to, let's say this point
over here, and let's say, for now that the Google
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servers are located somewhere
in Portugal over here.
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Well that signal of me looking for that IP address of
Google and looking for those Google files is going
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to go through this submarine cable.
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Yeah, you heard that right.
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It's a physical cable that goes at the bottom of the
sea floor from Brazil all the way to Portugal where
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the Google servers are.
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And then the Google server says yep I got those
files here there are and sends it all the way back.
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Through the ISP all the
way back to our house.
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Isn't that cool that there's physical cables that are
connecting, and creating the Internet so you know
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there are times where somebody destroys or something
happens where these cable connections are cut off
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and you sometimes lose
internet connection that way.
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But yeah the Internet backbone is literally just
this network all over the world of connected cables
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so that we can transfer these
files all over the world.
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And just to show you how insane this is somebody from the
Opte Project over here - I got this off of Wikipedia,
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mapped out, and I believe this was in 2015, just 30
percent of the network, and you can see over here that
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each one of these dots is an IP address.
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So, a computer that is connected to another
computer, that is connected to another computer.
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And that's the Internet.
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The Internet is just all these connected computers
that are just transferring files between each other
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and as web developers and
this is the coolest thing.
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And that's why I just think everybody should
be a web developer because it's so cool.
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You're allowing this to happen.
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You're allowing this transferring of files from one
computer to another, transferring knowledge from
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Brazil to Portugal and all over the world and you get to
be part of it - you get to be part of this networking
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and get to evolve.
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When this picture of the Internet came to
me I knew that this was the career for me.
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So, hopefully that gets you
excited in the next session.
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I'm going to show you
something really cool.
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Traceroute before we finish up the lesson and we get
into the next sections so hope that was cool see
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in the next one.
8000
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