1. How Does the Internet Work? u Tree-like set of computer connections u Information sent from node to node u Tree is navigated by a multi-part address u Example: president@whitehouse.gov u gov: name server u whitehouse: local server u president: targeted user

2. How an Address is Traced president@whitehouse.gov

3. How an Address is Traced mil gov edu com president@whitehouse.gov Name server is consulted

4. How an Address is Traced mil gov edu com fbi irs whitehouse president@whitehouse.gov Local server is found

5. How an Address is Traced mil gov edu com fbi irs whitehouse president vice_president first_lady supervisor_of_interns president@whitehouse.gov User is located

6. Why is the Internet so Important? u Functions have been around > 10 years u Why did it surface in the media in 1995?

7. Why is the Internet so Important? u Functions have been around > 10 years u Three reasons it surfaced in 1995: u World-Wide Web

8. WWW: One of Two Most Visible Components of the Internet u World-Wide Web u E-mail u FTP u Telnet u Usenet

9. The World-Wide Web u Hyperlinked, Distributed, Standardized Multimedia Documents u Translation:  anyone, on a wide variety of computers anywhere, can  point and click on linkages  to text, graphics, audio, video  from any other host to your host, and ultimately, to your PC  without being aware of how it is done (at last!)

10. File Transfer: Then and Now FTP oak.oakland.edu anonymous password cd pub/binaries/gifs set file type binary send pepsi.gif logout exit THEN

11. File Transfer: Then and Now FTP oak.oakland.edu anonymous password cd pub/binaries/gifs set file type binary send pepsi.gif logout exit Click here to download the file THENVs. NOW

12. Detailed Steps in Loading a Page

14. “www.hillary.com” Detailed Steps in Loading a Page

15. “www.hillary.com” Name Server Detailed Steps in Loading a Page

16. “136.142.65.1” Name Server Detailed Steps in Loading a Page

17. “136.142.65.1” Name Server Detailed Steps in Loading a Page

18. “136.142.65.1” Detailed Steps in Loading a Page

19. “136.142.65.1” Detailed Steps in Loading a Page

20. Hillary’s page Detailed Steps in Loading a Page