what is the internet
DESCRIPTION
I'm trying to break down concepts of The Internet for a Grade 4 class presentation. New versions will be uploaded as I get any helpful feedback!TRANSCRIPT
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What is the Internet?
An attempt to break it down for a Grade 4 class
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NO MORE BARRIERS
• We live in a time where the Internet is present everywhere around the world from the base camp of Mount Everest, and spanning across every continent
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But what is it?
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You’re already PART of it
• Since you’re close to 10 years, you’ve been surrounded by the Internet for all your life. (Does it tingle?)
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Internet = Ice Cream Sandwich
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Let’s start with “network”
• What does “network” mean to you?• You are in many “people” networks already:– your friends– your family– your school and community– people who love Spongebob
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And a computer network?
• Similar to a "people network", a computer network is a group of machines that talk to each other.
• Just like your different kinds of "people networks", a computer network on the internet is hooked up to other computer networks which form a giant "web"
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How does a website work?
• What happens when you type www.google.com in your web browser?
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..making a phone call
• Every machine on the internet is given an address made of numbers to make sure every location is unique
• Why is that important?
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machine talk
• The computers find each other with these address numbers
• Numbers are consistent across almost every speaking language – a German “1” is written no differently than a French “1”
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But people speak words
• People finding a machine don’t want to speak in numbers
• We want to use words and / or names
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Domain Name Service
• Imagine a giant phonebook (aka. Santa’s list?)• The phonebook can find every machine on the
internet through both their name and their number
• Eg. “google.com” = 74.125.226.112
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How do machines TALK?!
• We understand that machines use the phone book to find each other…but then what?
• Ideas?
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Idea #1
• Do machines talk in a human language? (like english for example)
• -it’s much easier for us to understand what is happening on the surface
• -but not every person speaks english and even within english are many dialects / ways of speaking
• -the internet is not free – size of your message determines its cost; like the post office
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Idea #2
• If not a speaking language, then what?• Data• Every machine understands binary which only
allows 1’s and 0’s• MAAAAAAAATTHHHHHHH
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Interruption everywhere
• Computer networks are not reliable and imperfect
• (REMEMBER THE WEB)• Just like a room full of people, machines can
also be interrupted during a conversation with another machine
• What’s the dealio?
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We need PROTOCOL
• A protocol establishes rules for doing things• There’s a protocol for asking your teacher a
question• There’s a protocol for talking to your parents• There’s a protocol for addressing her Majesty,
the Queen of England and it doesn’t start with “yo Queen”
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Chocolate layer = TCP
• TCP is the lowest level protocol of the web
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Message example
• Imagine moving a large message from your room to your friends house
• Too big to bring in one piece• Too heavy to bring in one piece• Let’s break it down into a jigsaw puzzle; we
can then bring the smaller pieces over to our friends house and put them back together
• Problems?
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Problem #1: order
• Order is kind of important• Impossible to reassemble the jigsaw puzzle
without knowing the order
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Idea – tagging
• If order is important, then maybe tagging can help
• Before we break the puzzle apart, we can tag each piece so that we know how to put everything back
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Problem #2 – data loss
• What if we lose a piece along the way?• A lost piece means we won’t have the whole
puzzle• I forgot to mention your friend lives on the
other side of the world – oops!• Ideas?
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Idea - resend
• When your friend is ready, you bring over a small number of pieces
• Once they are safe, your friend tells you to send the next small batch
• If your friend is missing a piece, you have to re-deliver that whole batch
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Tip of the iceberg
• I left out a LOT of stuff• I gave you enough words ; go google!