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Internet and WWW. Internet A way to send an array of bytes from any machine to any other machine Internet.

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Presentation on theme: "Internet and WWW. Internet A way to send an array of bytes from any machine to any other machine Internet."— Presentation transcript:

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) Internet 128.78.22.32 233.21.1.45 117.211.23.22 233.12.32.111

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

5 Domain Name - a pathname in a tree EDU COM GOV BYU CS WWWICIE EE MITUtahMicrosoft research Yahoo whitehouse LOC

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

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

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

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

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 Name name 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 cs100 schedule.html Lectures server.gif L1.ppt cs456 Homework Program1 Program2

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

19

20

21

22

23 Links

24 http://nasa.gov/home.html http://nasa.gov/security.html http://nasa.gov/NTV.html

25 Search Engines Links

26 Search Engines ??

27 Search Engines Pathname in a category tree

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