The document provides an overview of the Internet and how it works. It discusses: 1. The Internet is a network of networks that connects millions of computers globally and allows for communication through email, file transfers, and access to information through websites. 2. Key components that enable the Internet include hardware like cables and routers, and software protocols for communication like TCP/IP, HTTP, and HTML. 3. The World Wide Web is a system for accessing information over the Internet through hyperlinked web pages that are written using HTML and accessed using URLs and HTTP.

1. Chapter 9THE INTERNET

2. RECAP: Computer NetworksLANWAN

3. HARDWAREHub:LAN hardware that transmits data to the nodes on the LAN “rude”. Switch:Hardware connectivity through which data travels. More efficient. keeps a record of the MAC addresses of all the devices connected to it.

4. Transmission Line Types, Uses, and Speed

5. WHAT IS INTERNET?A network of networks, joining many government, university and private computers together and providing an infrastructure for the use of E-mail, bulletin boards, file archives, hypertext documents, databases and other computational resourcesThe vast collection of computer networks which form and act as a single huge network for transport of data and messages across distances which can be anywhere from the same office to anywhere in the world.Written by William F. Slater, III1996President of the Chicago Chapter of the Internet Society

6. History of THE internet1969 : ARPANET was born. 4 nodes were inter-connected: UCLA,SRI,UCSB, U. of Utah Charley Kline from UCLA sent 1st packet.1972 : First computer-to-computer chat program at UCLA.1975 : First mailing list was created by Steve Walker.1984 : DNS (Domain Name System) was introduced.1988 : First Internet Worm.1990 : AOL, CompuServe provided dial-up service.1991 : WWW was created by Tim Berners-Lee from CERN1994 : Commercial network. Shopping mall. Can order pizza online.1998 : 2M domain names registered. Compaq bought altavista.com for $3.3M. Google founded2003 : Facebook launched

7. A global network of computers that communicate using a common language (network of networks)

8. Internet is composed of two parts: the infrastructure (hardware), and the software (applications and protocols)

9. Hardware:

10. cables, routers, computers, and servers.

11. Software:

12. applications, programming languages, databases, and protocols that make communicationTHE INTERNET

13. Internet characteristicsThe power of the Internet:1. Ubiquity2. Low cost3. Global Reach4. Open and Shared ownership5. Richness – complexity and content of the message 6. Interactivity

14. WWWThe world wide web is a sophisticated system for universal information capture and delivery

15. The world wide web consortium (W3C) definition of the web: "The World Wide Web is the universe of network-accessible information, an embodiment of human knowledge"

16. Provides information access in ways not previously possible

17. Hyperlinked (Hypertext)

18. Graphical user interface

19. Pictorial and non-text information

20. Information that changes rapidly

21. Immediate access

22. Anyone can author a web site