Internet 1) John R. Levine, Margaret Levine Young, The Internet for Dummies. Wiley Publishing, 12 th Edition, 2010.

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Presentation transcript:

Internet 1) John R. Levine, Margaret Levine Young, The Internet for Dummies. Wiley Publishing, 12 th Edition, 2010.

Internet: the world’s largest computer network. Computer network: a group of computers that communicate with each other. Services: huge amount such as: , World Wide Web, Instant messaging, etc Advantages: + Find information: Google, Bing, Yahoo, etc + Stay in touch: , blog, social network, voice chat, VoIP, etc + Get education: online learning, e-books, libraries, etc + E-business: buy, sell, pay, invest, etc + Computing: parallel Basic Concepts

Dangers from Internet Phishing: a tricky activity by getting victim’s identity, bank account numbers, etc. over the Internet or by , and then using these to steal money from them. Virus: + Programs spread from computer to computer + Steal your info, destroy your computer + Use your computer to attack other computers Spyware: like a virus but your browse allows them attack your computer. Spam mails: unwanted s or messages sent to your account.

Safety first: + Don’t use your full name on public websites + Never provide private information to stranger + No legitimate entity will ever ask you for your password. + Be especially careful about disclosing information about kids. + Don’t click links or open attached files in strange s. Protect from Dangers Softwares: + Anti-virus: detect & delete viruses + Firewall: prevent your computer from intrusions + Frequently update software patches

World Wide Web (Web) Web: + Huge amount of pages of information connected to each other. + Page: a combination of text, pictures, audio, video, animations, links. + Hyperlink(link): a connection to other page. When clicking a link, browser displays the page of link. + Uniform Resource Locator(URL): address of a page. Browser uses addresses to find pages. Browser: + Programs that find Web pages and displays them. + Popular browsers: Internet Explorer, Firefox, Chrome, Safari. + Address box: displays the Web URL of current page. + Favorites/Bookmarks: store URLs. + Save page: store page in your computer to read offline.

Searching A lot of information on the Internet. How to find them?  Search engines. Search engine: periodically looks at every page it can find on the Internet, extracts keywords from them, and make a big list. Popular search engines: + Google: + Bing: + Yahoo:

Electronic mail ( ): the most popular Internet service. Every computer connects to the Internet can send and receive . Web-based service (webmail):many websites provide free mailboxes. Register to get account. Some popular service: mail.yahoo.com, mail.live.com. address: + Unique address for each account. + Consists of 2 parts: + Username & password: when register an account, you need to specify username and password. Password must be kept in secret. + Login account: issue username & password.