THE INTERNET Computer Fundamentals. TODAY I AM: Learning about the complexity of sending messages...
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Transcript of THE INTERNET Computer Fundamentals. TODAY I AM: Learning about the complexity of sending messages...
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THE INTERNETComputer Fundamentals
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TODAY I AM: Learning about the complexity of sending messages over
the Internet Translating web addresses into IP addresses Solving problems!
SO THAT I CAN: Understand the flow of the Internet while learning about
web addresses, IPs and the DNS
I’LL KNOW I’VE GOT IT IF: I can differentiate between: WiFi, DSL and Fiber Optic Work together with my classmates to translate messages
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TERMS TO KNOW:
IP (Internet Protocol) IP Address DNS (Domain Name
Service) URL (Universal
Resource Locator) Internet Network
Packets Routing Servers Fiber-Optic Cable WiFi DSL/Cable
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WHAT IS THE INTERNET?
The Internet, also called the Net, is a worldwide collection of networks that links millions of busi- nesses, government agencies, educational institutions, and individuals.
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WHERE DID THE INTERNET START? Department of
Defense Goals:
Allowed scientists to share information
Function even if part of the network was disabled or destroyed
Became functional in September 1969
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THE INTERNET
The Internet consists of many local, regional, national, and international networks.
Both public and private organizations own networks on the Internet.
These networks, along with telephone companies, cable and satellite companies, and the government, all contribute toward the internal structure of the Internet.
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THE INTERNET
Each organization on the Internet is responsible only for maintaining its own network. No single person, company, institution, or government agency controls or owns the Internet.
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CONNECTING TO THE INTERNET
Many home and small business users connect to the Internet via high-speed broadband Internet service. With broadband Internet service, your computer or mobile device usually is connected to the Internet the entire time it is powered on.
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EXAMPLES OF BROADBAND INTERNET Cable Internet service:
provides high-speed Internet access through the cable television network via a cable modem.
DSL (digital subscriber line): provides high-speed Internet connections using regular telephone lines
Fiber Optic: Uses fiber-optic cable to provide Internet access
Fixed wireless: provides high-speed Internet connections using a dish-shaped antenna on your house or business to communicate with a tower location via radio signals
WiFi (wireless fidelity): uses radio signals to provide high-speed Internet connections to wireless computers and devices
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GETTING TO A WEBSITE
All addresses inside the internet are actually combinations of numbers, rather than names.
When you ask for a specific website, the inquiry goes out to the internet to translate that name into an IP address
After a series of steps, the inquiry comes upon the DNS TranslationTable, where it can get the numerical version of the URL address that you originally entered
At last, you’re there!
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BUT WAIT!
Believe it or not, the Internet isn’t able to send and receive an unlimited amount of information at one time.
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HOW INFORMATION IS SENT
Think of it as sending all your favorite photos to your grandma in a single envelope
It wouldn’t fit! Break up the “packet”
into smaller pieces Send several
“packets” so you can get grandma your pics
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WHAT IF THERE IS A DELAY IN THE MAIL?
How will grandma know if all the “packets” arrived?
How will she know what order to open them?
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DNS Translation Table
Code.org 23.23.160.123
Thinkersmith.org 64.14.68.10
CSEDweek.org 174.129.210.209
CSisFun.com 198.58.93.24
khanacademy.org 107.20.223.238