How the Internet Works

CPA

Internet Addresses• How do you get to the school’s website?• What you as the user sees is a web address or

URL – Uniform Resource Locator

• HTTP – Hypertext Transfer Protocolo Protocol is just a request to send informationo HTTP is the most commono HTTPS – the s means a secure site

• Sub-domaino Sometimes requiredo Not always www; not all sites part of the webo www stands for world wide web

• Domain nameo The owner of the addresso Name of the web server

Domains

• Top level domain – what kind of website is ito .com – commercial (business for profit)o .org – organization (most often non-profit)o .edu – educational siteo .gov – government siteo .mil – military siteo .net -- network

• File names are just pages on that website; not necessary to reach the website

Parts of a URL

What the computer sees

• Computers don’t understand text• They transfer Internet into numbers.• Computers have an address called an IP Address,

just like phones have phone numberso 23.23.154.295

Sending pictures and video

• Send all your favorite pics to grandma• Break into smaller pieces or packets

Transmission• Fiber – messages with one hand• DSL/Cable – message on the back of your hand• Wifi – message on head

Activity – 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• Khanaacademy.org –

107.20.223.238