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Internet and WWW

Internet and WWW. Internet. A way to send an array of bytes from any machine to any other machine. Internet. How to identify the machine to send to. By address (IP Address - 4 bytes). 233.21.1.45. 128.78.22.32. Internet. 117.211.23.22. 233.12.32.111.

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Internet and WWW

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  1. Internet and WWW

  2. Internet • A way to send an array of bytes from any machine to any other machine Internet

  3. How to identify the machine to send to • By address (IP Address - 4 bytes) 233.21.1.45 128.78.22.32 Internet 117.211.23.22 233.12.32.111

  4. How to identify the machine to send to • By name (domain name) Icie.cs.byu.edu Croatian.cs.byu.edu Internet Yahoo.com Myhome.isp.com

  5. Domain Name - a pathname in a tree GOV COM EDU LOC BYU MIT Utah Microsoft Yahoo whitehouse EE research CS WWW ICIE

  6. Icie.cs.byu.edu GOV COM EDU LOC BYU MIT Utah Microsoft Yahoo whitehouse EE research CS WWW ICIE

  7. Servers • Computers that store information or services Icie.cs.byu.edu Internet Yahoo.com

  8. Clients • Programs that help users get access to info Netscape Internet Instant messenger

  9. Protocol • Language for computers to talk with each other Netscape HTTP Internet IRC Instant messenger

  10. Review • Internet • Array of bytes between computers • By address 128.23.12.1 • By name icie.cs.byu.edu • Server - delivers info on request • Client - helps user access server info • Protocol - language for computers to talk with each other

  11. URL (Uniform Resource Locator) • http://www.yahoo.com/ • http://www.espn.com/nba • http://icie.cs.byu.edu/cs100/schedule.html

  12. URL - Protocol • http://icie.cs.byu.edu/cs100/schedule.html • ftp://netscape.com/downloads/msng.exe • mailto:george.w.bush@whitehouse.gov

  13. URL - Domain Namename of the server to access • http://icie.cs.byu.edu/cs100/schedule.html • ftp://netscape.com/downloads/msng.exe

  14. URL - page name • http://icie.cs.byu.edu/cs100/schedule.html • ftp://netscape.com/downloads/msng.exe

  15. URL - page name • http://icie.cs.byu.edu/cs100/schedule.html • http://icie.cs.byu.edu/cs100/Lectures/server.gif • http://icie.cs.byu.edu/cs100/Lectures/L1.ppt • http://icie.cs.byu.edu/cs456/Homework/Program1 • http://icie.cs.byu.edu/cs456/Homework/Program2 • -

  16. URL - page name • http://icie.cs.byu.edu/cs100/schedule.html • http://icie.cs.byu.edu/cs100/Lectures/server.gif • http://icie.cs.byu.edu/cs100/Lectures/L1.ppt • http://icie.cs.byu.edu/cs456/Homework/Program1 • http://icie.cs.byu.edu/cs456/Homework/Program2 • Page names are pathnames in a tree

  17. URL - page name • cs100/schedule.html • cs100/Lectures/ server.gif • cs100/Lectures/L1.ppt • cs456/Homework/Program1 • cs456/Homework/Program2 cs456 cs100 Homework Lectures Program1 schedule.html Program2 server.gif L1.ppt

  18. Hypertext • How to link together many documents so that users can get whatever information they want.

  19. Links

  20. http://nasa.gov/home.html Links http://nasa.gov/security.html http://nasa.gov/NTV.html

  21. Search Engines Links

  22. ?? Search Engines

  23. Pathname in a category tree Search Engines

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