Скачать презентацию Computers Information Technology in Perspective 11 e Larry Скачать презентацию Computers Information Technology in Perspective 11 e Larry

0fa6bcda4d14d4e83e24c72c9409ad7b.ppt

  • Количество слайдов: 29

Computers: Information Technology in Perspective, 11 e Larry Long and Nancy Long Chapter 3 Computers: Information Technology in Perspective, 11 e Larry Long and Nancy Long Chapter 3 Going Online Copyright Prentice Hall, Inc. 1

Objectives n Once you have read and studied this chapter, you will have learned: Objectives n Once you have read and studied this chapter, you will have learned: ¨ The scope of the online world and some of its many opportunities, plus Internet concepts, including how to go online and the makeup of an Internet address. ¨ How you can use Internet browsers to access a wealth of information on the Internet. ¨ The scope of Internet resources and the various types of Internet applications, including the World Wide Web, FTP, e-mail, instant messaging, newsgroups, and videoconferencing. Copyright Prentice Hall, Inc. 2

Why this chapter is important to you! Learning how to go online will open Why this chapter is important to you! Learning how to go online will open many doors to information n Learning how to go online can change how you learn, shop, communicate, and work for the better n Learning how to go online to search for jobs could land you that dream job n Copyright Prentice Hall, Inc. 3

The Internet n n n The Internet is a network of networks It began The Internet n n n The Internet is a network of networks It began in 1969 as ARPAnet (Advanced Research Projects Agency) No central authority and thus impossible to state the precise size The Internet is not free just because you do not pay for it When you go online you have access to billions of pages of information and resources, such as: ¨ ¨ ¨ ¨ Research on just about any topic Current weather anywhere in the world Travel arrangements Health information Shopping for anything and everything Services And lots more… Copyright Prentice Hall, Inc. 4

Connecting to the Internet n n n Channels carry digital signals between computers and Connecting to the Internet n n n Channels carry digital signals between computers and over the Internet Bandwidth is the number of bits a line can transmit per second Broadband ¨ n High bandwidth Narrowband ¨ Low bandwidth Copyright Prentice Hall, Inc. 5

Narrowband n Dialup Service ¨ Available to anyone with POTS n n Copyright Prentice Narrowband n Dialup Service ¨ Available to anyone with POTS n n Copyright Prentice Hall, Inc. Plain old telephone service Data transmissions are up to 56 K bps 6

Broadband n n n 15 to 30 times faster than narrowband Broadband is always Broadband n n n 15 to 30 times faster than narrowband Broadband is always on Broadband options ¨ Cable ¨ DSL ¨ Satellite ¨ Wireless Copyright Prentice Hall, Inc. 7

The Link to the Internet n Commercial Information Service ¨ AOL is an example The Link to the Internet n Commercial Information Service ¨ AOL is an example ¨ Monthly service charge ¨ Communications software needed ¨ User ID and password Copyright Prentice Hall, Inc. 8

The Link to the Internet n Internet Service Provider ¨ Provides access to the The Link to the Internet n Internet Service Provider ¨ Provides access to the Internet ¨ Low-speed dialup or high-speed connection ¨ ISPs: n n n Commercial Enterprises Colleges Churches Copyright Prentice Hall, Inc. 9

TCP/IP and Packets n n n TCP/IP is the communications protocol that permits data TCP/IP and Packets n n n TCP/IP is the communications protocol that permits data transmission over the Internet Data is sent in packets Each POP has an IP address for packet delivery Copyright Prentice Hall, Inc. 10

Going Online Without a PC n n Go online with your TV Go online Going Online Without a PC n n Go online with your TV Go online with your game device Go online with an Internet appliance Going online with your cell phone Copyright Prentice Hall, Inc. 11

Retrieving and Viewing Information on the Internet n n n To go online you Retrieving and Viewing Information on the Internet n n n To go online you need a client Internet Explorer or Netscape is a client You can give the browser a URL to find a site or search for a site Copyright Prentice Hall, Inc. 12

The Internet Address: URL http: //www. annex. com/southwest/museum. htm Document Path (Directory or Folder) The Internet Address: URL http: //www. annex. com/southwest/museum. htm Document Path (Directory or Folder) Internet Address (Web site) Means of access, Hyper. Text Transfer Protocol Copyright Prentice Hall, Inc. 13

HTML: Putting the Page Together n n HTML is a scripting language <HTML> </HTML> HTML: Putting the Page Together n n HTML is a scripting language ¨ n Head: ¨ n Must be at beginning and end of the Web page Includes: basic document info Other HTML: ¨ ¨ ¨

¨ Copyright Prentice Hall, Inc. 14

Internet Browsers Tool Bar Menu Bar Address Bar Hyperlink Status Bar Copyright Prentice Hall, Internet Browsers Tool Bar Menu Bar Address Bar Hyperlink Status Bar Copyright Prentice Hall, Inc. 15

Concepts and Features n Hyperlinks ¨ Provide text, graphics, sound, or video links Blue Concepts and Features n Hyperlinks ¨ Provide text, graphics, sound, or video links Blue underlined fonts are unexplored ¨ Magenta links have been previously accessed ¨ www. microsoft. com Copyright Prentice Hall, Inc. 16

Internet Servers and Addresses n n HTTP: Hypertext Transfer Protocol FTP: File Transfer Protocol Internet Servers and Addresses n n HTTP: Hypertext Transfer Protocol FTP: File Transfer Protocol News: Newsgroups Gopher: Gopher menu tree Copyright Prentice Hall, Inc. 17

Browsers Plugins n ¨ n Play and record MP 3 music Liquid. Player ¨ Browsers Plugins n ¨ n Play and record MP 3 music Liquid. Player ¨ ¨ ¨ Play and record MP 3 music Read lyrics Organize your music n View Quick. Time videos Listen to music i. PIX ¨ n Listen to streaming audio View streaming video Quick. Time ¨ ¨ Real. Jukebox ¨ n n View Flash content Real. Player ¨ ¨ Displays Web content Flash Player ¨ n n Shockwave Player View an image from every direction Acrobat Reader ¨ Displays PDF documents Copyright Prentice Hall, Inc. 18

Internet Resources and Applications n n n n Portals Libraries Online Magazines and Journals Internet Resources and Applications n n n n Portals Libraries Online Magazines and Journals Arts Travel Government News And more… Copyright Prentice Hall, Inc. 19

Finding Resources n n n Use the Search button on the Internet Explorer Toolbar Finding Resources n n n Use the Search button on the Internet Explorer Toolbar Try multiple search engines on one query Be aware of logical operators AND, OR, and NOT Search on a concept: e. g. , “first ladies” rather than “Eleanor Roosevelt” Set Bookmarks/Favorites n Search Engines ¨ www. yahoo. com ¨ www. infoseek. com ¨ www. google. com ¨ www. altavista. com ¨ www. hotbot. com ¨ Lots Copyright Prentice Hall, Inc. more… 20

Internet Applications n WWW ¨ Internet system n User friendly n Multimedia n Interactive Internet Applications n WWW ¨ Internet system n User friendly n Multimedia n Interactive ¨ FTP n Download files n Upload files ¨ Webcasting n Audio signals Copyright Prentice Hall, Inc. 21

Communication with People over the Net: E-Mail Menu Bar Toolbar Shortcuts Inbox Message Attachment Communication with People over the Net: E-Mail Menu Bar Toolbar Shortcuts Inbox Message Attachment Copyright Prentice Hall, Inc. 22

Communication with People over the Net: Audio Mail Menu Bar Video Text Chat Sound Communication with People over the Net: Audio Mail Menu Bar Video Text Chat Sound Control Microphone Control Type Here Copyright Prentice Hall, Inc. 23

Communication with People over the Net n USENET Newsgroups ¨ Bulletin boards ¨ Threads Communication with People over the Net n USENET Newsgroups ¨ Bulletin boards ¨ Threads n Mailing lists or listservs ¨ Subscription service ¨ Push technology Copyright Prentice Hall, Inc. 24

Communication with People over the Net: Internet Relay Chat: IRC Typed messages People online Communication with People over the Net: Internet Relay Chat: IRC Typed messages People online Format choices Type message Copyright Prentice Hall, Inc. 25

Instant Messaging & Internet Telephone Private Messages Video Audio Copyright Prentice Hall, Inc. 26 Instant Messaging & Internet Telephone Private Messages Video Audio Copyright Prentice Hall, Inc. 26

Communication with People over the Net: Cybertalk and Netiquette n n n Avoid ALL Communication with People over the Net: Cybertalk and Netiquette n n n Avoid ALL CAPS Never send spam Be sensitive Never send personal information via e-mail Be patient n n n Avoid correcting email errors, such as spelling Honor privacy Think twice about sending large files Never forward a virus Use antivirus software Copyright Prentice Hall, Inc. 27

Cruising the Net. com. edu. firm. gov. int. mil. net. org Commercial Education Businesses Cruising the Net. com. edu. firm. gov. int. mil. net. org Commercial Education Businesses Government International Military Network Resources Nonprofit Organizations Copyright Prentice Hall, Inc. 28

Summary n n n The Internet Browsers Internet Resources and Applications Copyright Prentice Hall, Summary n n n The Internet Browsers Internet Resources and Applications Copyright Prentice Hall, Inc. 29