Discovering Computers Chapter 2 The Internet and World Wide Web
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1 Discovering Computers 2008 Chapter 2 The Internet and World Wide Web
2 Just remember It took 38 years for radio to reach 50 million users 13 years for television to reach 50 million users Less than 4 years for the Web to do the same! By 2010, about 80% of the planet will be on the Internet
3 The Internet What are some services found on the Internet? p Fig. 2-1 Next
4 History of the Internet How did the Internet originate? Goal: To allow scientists at different locations to share information ARPANET Networking project by Pentagon s Advanced Research Projects Agency (ARPA) Became functional September 1969 Goal: To function if part of network were disabled p. 69 Next
5 History of the Internet How has the Internet grown? Today More than 350 million host nodes 1984 More than 1,000 host nodes 1969 Four host nodes p. 69 Next
6 ARPANET Started as WAN with 4 main computers University of California at Los Angeles Stanford Research Institute University of California at Santa Barbara University of Utah By 1984 ARPANET = 1,000 nodes (hosts) Today more than 350 million nodes/hosts connect to Net September 1969
7 ARPANET September 1971
8 History of the Internet Who controls the Internet? No onec cit is a public, cooperative, and independent network Several organizations set standards World Wide Web Consortium (W3C) Oversees research, sets standards and guidelines Tim Berners-Lee, director Internet2 (I2) Internet-related research and development project Develops and tests advanced Internet technologies p. 70 Next
9 How the Internet Works How can you connect to the Internet? Slow-speed technology Dial-up access modem in your computer uses a standard telephone line to connect to the Internet High-speed connection DSL, cable modem, fixed wireless, Wi-Fi, and satellite modems Connection must be established each time you log on. Connection is always on whenever the computer is running p. 70 Next
10 How the Internet Works What are ways to access the Internet? 1. ISP, Regional or National 2. OSP (AOL and MSN, for example) 3. WISP wireless Internet service provider Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Wireless Internet Service Provider below Chapter 2 p Fig. 2-2 Next
11 How the Internet Works How might data travel the Internet using a cable modem connection? Backbone Maps p. 73 Fig. 2-3 Next
12 How the Internet Works What is a Hypertext Transfer Protocol (HTTP)? A set of rules that define how to transfer or convey information over the Internet. To learn more about how the Internet works click here to watch a video. p Figs Next
13 How the Internet Works What is a domain name? Text version of Internet Protocol (IP) address Number that uniquely identifies each computer or device connected to Internet p Figs Next
14 How the Internet Works What is a domain name system (DNS)? A method used by the Internet to store domain names and the corresponding IP addresses. so data can be routed to the correct computer. DNS server is an Internet server that translates the domain name (text version) into its associated IP address (numeric version). DNS server Temple web server Internet
15 What is the World Wide Web (WWW)? A worldwide collection of electronic documents Also called the Web Each electronic document is called a Web page Can contain text, graphics, audio, video, and built-in connections A Web site is a collection of related Web pages p. 75 Next
16 What is a Web browser? Program that allows you to view Web pages Microsoft Internet Explorer Firefox Netscape Opera Safari p. 75 Next
17 What is a home page? The first page that a Web site displays Often provides connections to other Web pages p. 68, 76 Fig.2-6 Next
18 How do handheld computers and cellular telephones access the Web? Use a microbrowser that displays Web pages that contain mostly text Must be Internetenabled p. 76 Fig. 2-7 Next
19 What is downloading? The process of a computer receiving information Depending upon connection speed, downloading can take from a few seconds to several minutes p. 76 Next
20 What is uploading? The process of a computer sending information p. 76 Next
21 What is a URL (uniform resource locator)? Unique address for a Web page A web server delivers the Web page to your computer p Fig. 2-8 Next
22 What is a hyperlink (link)? Built-in connection to another related Web page location Item found elsewhere on same Web page Different Web page at same Web site Web page at a different Web site p. 77 Next
23 How can you recognize links? Pointer changes to a small hand when you point to a link A link can be text or an image Text links are usually underlined and in a different color p. 77 Fig. 2-9 Next
24 What is a subject directory? Search tool with organized set of categories and subcategories Lets you find information by clicking links rather than entering keywords p Next
25 What is a search engine? Program used to find Web sites and Web pages by entering words or phrases called search text Also called a keyword p Fig Next
26 What is a hit? Any Web site name that is listed as the result of a search p. 80 Fig Next
27 What are the twelve basic types of Web sites? Portal News Informational Business/ Marketing Educational Entertainment Advocacy Blog Wiki Social Network Content Aggregator Personal p Next
28 What is a portal? A Web site that offers a variety of services from one, convenient location, usually for free Searching, sports, , news, weather, auctions, online communities (Web sites that join people with similar interests) p Next
29 What is a wiki? Collaborative Web site that allows users to create, add to, modify, or delete the Web site content via their Web browser p Next
30 What is a blog? Uses a regularly updated journal format to reflect the interests, opinions, and personalities of the author and sometimes site visitors vlogs, blogospheres, and vlogospheres p Next
31 What is a content aggregator? Business that gathers and organizes Web content and then distributes, or feeds, the content to subscribers for free or a fee Google news _for_news p Next
32 What is an educational Web site? Offers avenues for formal and informal teaching and learning Learn how airplanes fly or how to cook a meal Some colleges offer online classes and degrees p Next
33 What are the guidelines for evaluating the value of a Web site? Affiliation Audience Authority Content Currency Design Objectivity p. 84 Fig Next
34 What is multimedia? Application integrating text with other media elements Graphics Animation Audio Video Virtual reality Plug-Ins p. 85 Fig Next
35 What graphics formats are used on the Web? BMP GIF (pronounced JIFF) JPEG (pronounced JAY-peg) PNG (pronounced ping) TIFF p. 85 Fig Next
36 What is a thumbnail? Small version of a larger graphicc used to improve Web page display time Usually click on thumbnail to display larger graphic p. 86 Fig Next
37 What is animation? Appearance of motion created by displaying a series of still images in sequence p. 86 Next
38 What is audio? Music, speech, or any other sound Individual compressed sound files that you download from the Web to your computer Common Web audio file formats are AAC, AIFF, ASF, MP3, WAV, WMA, RA, and QT Once downloaded, you can play (listen to) the contents of the files A podcast is recorded audio, usually an MP3 file, stored on a Web site that can be downloaded to a computer or a portable media player p Fig Next
39 What is video? Consists of full-motion images, most with sound, that are played back at various speeds MPEG (Moving Pictures Experts Group) is popular video compression standard Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click YouTube below Chapter 2 p. 88 Fig Next
40 What is streaming audio/video? The process of transferring audio/video in a continuous and even flow Enables you to listen to music or watch a video as it downloads to your computer SkreemR p. 86 Next
41 What is virtual reality (VR)? Use of computers to simulate real or imagined environment Appears as a three dimensional (3-D) space Used for games and many practical applications p Fig Next
42 What are plug-ins? Programs that extend the capability of a browser You can download many plug-ins at no cost from various Web sites p. 89 Fig Next
43 What is Web publishing? Development and maintenance of Web pages Step 1. Plan the Web site Step 2. Analyze and design the Web site Step 3. Create the Web site Step 5. Maintain the Web site Step 4. Deploy the Web site p Fig Next
44 E-Commerce What is E-commerce? Short for electronic commerce Business transaction that occurs over the Internet Business to consumer (B2C) Sale of goods to general public Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click PayPal below Chapter 2 Consumer to consumer (C2C) One consumer sells directly to another Business to business (B2B) Business providing goods and services to other businesses p Fig Next
45 Other Internet Services What is ? Short for electronic mail The transmission of messages and files via a computer network Messages can consist of simple text or can contain attachments, such as documents, graphics, or audio/video clips Internet access providers usually provide an program Some Web sites such as MSN Hotmail and Yahoo! provide free services (Gmail the best?!) Common outgoing protocol used by servers is SMTP Simple Mail Transfer Protocol Common incoming protocol is POP Post Office Protocol One of the original services on the Internet Next
46 Other Internet Services What is an address? Unique name that consists of a user name and domain name that identifies the user p. 94 Fig Next
47 Other Internet Services How does an message travel? Step 1. Using software, you create and send message Step 2. Your software contacts software on your service provider s outgoing mail server Step 4. When recipient uses software to check for messages, the message transfers from incoming mail server to recipient s computer Step 3. Software on outgoing mail server determines best route for data and sends message, which travels along Internet routers to recipient s incoming mail server p. 95 Fig Next
48 Other Internet Services What is FTP? File Transfer Protocol Internet standard that allows you to upload and download files with other computers on the Internet Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click FTP below Chapter 2 p. 96 Fig Next
49 Other Internet Services What are newsgroups and message boards? Newsgroup Online area where users discuss a particular subject Message board Type of discussion group Many Web sites use message boards because they are easier to use Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Newsgroups and Message Boards below Chapter 2 p Fig Next
50 Other Internet Services What is a chat? Real-time typed conversation that takes place on a computer Chat room is location on server that permits users to discuss topics of interest Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Chat Rooms below Chapter 2 p. 98 Fig Next
51 Other Internet Services What is instant messaging (IM)? A real-time Internet communications service that notifies you when one or more people are online and allows you to exchange messages or files p Fig Next
52 Other Internet Services What is internet telephony? Enables users to speak to other users over the Internet Click to view Web Link, click Chapter 2, Click Web Link from left navigation, then click Internet Telephony below Chapter 2 p Fig Next
53 Netiquette What is netiquette? Code of acceptable behaviors users should follow while on the Internet Golden Rule: Treat others as you would like them to treat you. p. 100 Next
54 Fun Quote of the Day Only in America do they keep the doors to banks open and then chain the pen to the table.
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