Internet is a public, cooperative, and independent network. Nowadays, people can find almost everything on the Internet. Internet was functional in September 1969.
- ARPA: Pentagon’s Advanced Research Project Agency
- ARPANET: Networking project by ARPA
Growth of the Internet:
- 1969: 4 host nodes
- 1984: more than 1000 host nodes
- Today: more than 500 millions host nodes
Two ways to connect to the Internet:
- Slow-speed technology: Dial-up access
o Dial-up access: modem in your computer uses a standard telephone line to connect to the Internet
- High-speed connection: DSL, cable modem, FTTP, fixed wireless, wireless modem, Wi-Fi, and satellite modems
o DSL: Digital Subcriber Line, which uses a sophisticated process to pack data onto copper wires
o Cable modem: device that allow a computer to transmit and receive data over certain types of transmission lines
o Wi-fi: wireless fidelity (wireless network)
Ways to access the Internet:
- ISP: Internet Service Provider
- OSP: Online Service Provider
- WISP: Wireless Internet Service Provider
Data travels over the Internet:
- Step 1: Request from your computer
- Step 2: A Cable modem transfers the computer’s digital signals to the cable television line in your house
- Step 3: Transferred to a central cable system
- Step 4: Transferred to a cable operator (ISP)
- Step 5: Through the Internet backbone to the destination server
- Step 6: The server re trieves the data and send it back to your computer
- Domain name: Text version of Internet protocol
- IP address: Number that uniquely identifies each computer or device connected to Internet
- World Wide Web (WWW): A worldwide collection of electronic documents
o Web page: Each electronic document. Can contain text, graphics, audio, video, and built-in connections
o Web site: a collection of related Web pages
- Web browser: Program that allows you to view Web pages
o Home page: The first page that a Web site displays
o Often provides connections to other Web pages
Internet-enabled mobile devices access the Web:
- Use a microbrowser that displays Web pages that contain mostly text
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