1. Introduction to the Internet Section 1B

2. This lesson includes the following sections: · The Internet: Then and Now · Using Your Browser and the World Wide Web · Search the Web

3. The Beginning: A “Network of Networks” In 1969, when the Advanced Research Project Agency (ARPA) of the U.S. Department of Defense began connecting computers at different universities The resulting network was called APRANET Goal: create a large network with multiple path – in the form of telephone lines – that could survive a nuclear attack or other disaster In the mid 1980s, NSF (National Science Foundation) joined the project after the Defense Department dropped its funding. The Internet- then and now

4. ARPA’s Network

5. However, the existing network could not handle the load NSF created a new, higher capacity network, called NSFNet The link between ARPANET, NSFnet, and other networks was called the Internet The process of connecting separate network is called internetworking Thus, Internet – a worldwide network of networks – gets its name The Internet- then and now

6. NSFnet only for academic research, not allow users to conduct private business Several private telecommunications companies built their own network backbone that functioned in much the same manner as NSFnet Like a tree’s trunk, a network backbone is the central structure that connects other elements of the network The Internet- then and now

7. Backones- high speed data lines

8. The original ARPANET was shut down in 1990, and government funding for NEFnet was discontinued in 1995. But the commercial Internet backbone services have easily replaced them Today, the Internet is still growing The Internet- then and now

9. The number of internet users is Expected to continue

10. Launching Your Browser A web page may open when you launch, this page is called the start page Navigating the Web Navigating the Web means moving from one Web page to another or from one Web site to another A Web page is a document formatted with Hypertext Markup Language (HTML) tags A Web site is a collection of related Web pages Using your browser and the world Wide web

11. Internet Explore

12. Using URLs Every Web page has a unique address, called a uniform resource locator, or URL http://www.nchu.edu.tw Using Hyperlinks A hyperlink is simply a part of the Web page that is linked to a URL Hyperlink is usually underlined Many Web pages also provide hyperlinked pictures or graphical buttons – called navigation tools Using your browser and the world Wide web

13. Navigating the web by typing a URl

14. Using Hyperlinked text on a web page

15. Using the Browser’s Navigation Tools Back and Forward Bookmark Getting Help With Your Browser Using your browser and the world Wide web

16. Back and Forward buttons

17. Bookmark

18. Selecting a Web page’s url from The history list

19. Internet Explore’s help window

20. Directory: A directory enables you to search for information by selecting categories of subject matter e.g., http://www.kimo.com.tw Search Engines: A search engine lets you search for information by typing one or more words. The engine then displays a list of Web pages that contain information related to your words. This type of look-up is called a keyword search e.g., http://www.google.comhttp://www.google.com Most Web-based search tools provide both directories and keyword search engines. Searching the web

21. Using a Directory: 1 你可以使用該網站的目錄來找尋許多主題的相關性網站。

22. Using a Directory: 2 選擇主題的類別和子類別。

23. Using a Directory: 3 列出和主題相關的網站清單。

24. Using a Search Engine 視你所輸入的準則，搜尋引擎通常產生數千 ( 甚至數十萬 ) 符合條件的清單。 若想縮小結果清單，你必須提供更明確的關鍵字。

25. Sites listed in a directory generally will provide valuable, relevant information. This is because, before adding a site to its list, a directory reviews the site’s content. Using Boolean Operators in Your Search Boolean Operator AND OR NOT The best way to determine how any search engine works is to study its Help-related pages. Searching the web

26. Help Links at the google Google 搜尋引擎的 Help 連結。在 Help 區域，提供 Google 的基礎概論及 如何搜尋等資訊，你也可以找到 Google 支援布林運算子、基礎和進階搜尋 技巧和其它的資訊， Help 區域是你第一次開始使用搜尋引擎的最佳去處。

27. Using a Metasearch Engine Use multiple search engines simultaneously to look up sites that match your keywords, phrase, or questions www.dogpile.com or www.mamma.comwww.dogpile.comwww.mamma.com Site-Specific Search Tools Searching the web

28. Site-specific search tools