1. How the internet sends messages
Routers & Redundancy
How the internet sends messages

2. How would you solve? On the handout, how would you solve problem #1?
Please write directly on the sheet

3. Passing a note problem In this scenario, students are like routers
Router – a computer designed to receive and redirect packets of information based upon the addressing [IP address].
If you chose to make multiple copies of the note and send in different paths, you are thinking like a router  - based on traffic
Multiple messages different routes are called redundancy.

4. How the Internet Works:
Routing
Grasslands
(Basic)
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5. Six degrees of Separation
What is a ‘degree of separation’?
Example: I am 2 degrees separated from The US President.
Think of who you have met or know.
“I know a guy who knows a guy…”
Linked in
Oracle of Bacon – oracleofbacon.org

6. We have a basic problem…
We need to get a message to someone, somewhere in the world.
We need to find a route to accomplish this task
Where do I go first?
Who do I entrust the message with?
Will my message get there?
I need to get a message to Issac P. Address
He lives in France and is plays tennis semi-professionally
He has a wife and 3 kids and lives outside of Paris.

7. Lives outside of Paris
Issac
Tennis community
France group
You

8. The Internet works in a similar manner
Let’s watch a short video! What happens when we access a website overseas? How does a large website travel so quickly?

9. Internet Simulator Find their IP address
Log into code.org and open lesson 10 – Internet simulator
Add a router if you need more space (3-4 classmates / router)
Send a simple “Hello” to a friend on the same router:
Find their IP address
Send a message to that address
Friend should send a response

10. Now, let’s read the traffic on our routers
Let’s now stop sending messages
Click on the Log Browser button to view the table of router data
Now, click on the SHOW ALL ROUTERS button