Teachers Discovering Computers Chapter Objectives 1 Of 3

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Teachers Discovering ComputersIntegrating Technology andDigital Media in the Classroom6th EditionChapter Objectives 1 of 3 Define communications Identify the basic components of acommunications system Describe how and why network computers areused in schools and school districts Explain how the Internet worksChapter 2Communications, Networks, theInternet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web2Chapter Objectives 2 of 3Chapter Objectives 3 of 3 Describe the World Wide Web portion of theInternet Explain how Web documents are linked to oneanother Explain the use of Web browser software Explain how to use a Web search tool to findinformation Identify several types of multimedia products available onthe Web Explain how Internet services such as e-mail, newsgroups,chat rooms, and instant messaging work Describe the educational implications of the Internet andthe World Wide Web Describe different ways to connect to the Internet and theWorld Wide Web Describe the pros and cons of Web 2.0 tools for teachersand studentsChapter 2: Communications, Networks, the Internet, and the World Wide Web3Chapter 2: Communications, Networks, the Internet, and the World Wide WebWhat Is Communications?What Is Communications? A process in which two or more computers ordevices transfer data, instructions, andinformation Sometimes called telecommunications Chapter 2: Communications, Networks, the Internet, and the World Wide Web54Electronic mail (e-mail)Voice mailFacsimile (fax)TelecommutingOnline servicesVideoconferencingInternetWorld Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web6

Communications NetworksCommunications Networks Basic communications system Two computers, one to send and one to receivedata Communications devices that send and receivedata A communications channel over which data is sentChapter 2: Communications, Networks, the Internet, and the World Wide Web7Communications Networks Twisted-pair cableChapter 2: Communications, Networks, the Internet, and the World Wide Web8 Local Area Networks (LAN) Covers limited geographical area Server manages resources Dial-up Modem External modem Internal modem Network interfacecards Wide Area Networks (WAN) Covers large geographical area Can consist of several LANs9Chapter 2: Communications, Networks, the Internet, and the World Wide Web10Networking the Classroom, School,and DistrictCommunications Networks School network server Example classroom Home Networks Connects multiplecomputers in yourhome or home office Share Internetaccess Share peripherals Can be wired orwirelessChapter 2: Communications, Networks, the Internet, and the World Wide Web Transmissions mediaCommunications Networks Digital vs. analogsignalsChapter 2: Communications, Networks, the Internet, and the World Wide Web Communicationschannel Three Macintoshcomputers Printer11Chapter 2: Communications, Networks, the Internet, and the World Wide Web12

Networking the Classroom, School,and DistrictNetworking the Classroom, School,and District Example schoolnetwork Example schooldistrict Classrooms Administration Computer labChapter 2: Communications, Networks, the Internet, and the World Wide Web Central office Various schools13Networking the Classroom, School,and DistrictChapter 2: Communications, Networks, the Internet, and the World Wide Web14Networking the Classroom, School,and District Wireless schools andclassrooms High-Speed or Broadband Access Government works to provide high speed Internetaccess to classrooms Broadband technology transmits signals at muchfaster speeds Keep in touch withfamily and friendsfrom anywhere Smart phones Handheld or netbookcomputers Notebook computers Wireless technologybrings the computerlab to studentsChapter 2: Communications, Networks, the Internet, and the World Wide Web15The Benefits of Computer Networks inEducation Sharing of computerhardware, software,and data resources Unlimited educationalresources Communicate withother educators andstudentsChapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web16What Is the Internet? Worldwide group of connected networks thatallow public access to information and services No single organization owns or controls Estimated over one billion users Variety of users17Chapter 2: Communications, Networks, the Internet, and the World Wide Web18

History of the InternetHistory of the Internet Started as a network of four computers at theUniversity of California at Los Angeles in 1969 Advanced Research Projects Agency (ARPA) –ARPANET More than 350 million host computers today Backbone first provided by National ScienceFoundation (NSF) – NSFnet Backbone now provided by variety of corporations Various organizations help define standards Internet2 (I2)Chapter 2: Communications, Networks, the Internet, and the World Wide Web Extremely high-speed network Develop and test latest Internet technologies Members include more than 200 universities in theUnited States, along with 115 companies19How the Internet WorksChapter 2: Communications, Networks, the Internet, and the World Wide Web20How the Internet Works Data is divided into packets Routers send packetsacross the Internet At the destination, thepackets arereassembled into theoriginal message Internet Access Providers Have permanent connections to the Internet Provide temporary connections to individuals andcompanies for a fee Regional and national ISPs Online service providers offer members only areas Transmission controlprotocol/Internet protocol (TCP/IP) is thecommunications protocol used by the InternetChapter 2: Communications, Networks, the Internet, and the World Wide Web21How the Internet WorksChapter 2: Communications, Networks, the Internet, and the World Wide Web22How the Internet Works The Internet Backbone Acts as a Highway Connecting to the Internet National ISPsuse dedicatedlines to connectdirectly to theInternet Regional ISPsconnectthrough leasedlines to nationalISPs Business or school network connected to theInternet Dial-up access Cable TV (CATV) Digital subscriberline (DSL) Public Internetaccess pointChapter 2: Communications, Networks, the Internet, and the World Wide Web23Chapter 2: Communications, Networks, the Internet, and the World Wide Web24

How the Internet WorksHow the Internet WorksPage 78 in your book Internet Addresses Numeric addresses Domain name Domain type abbreviations Country code abbreviationsChapter 2: Communications, Networks, the Internet, and the World Wide Web25The World Wide Web26The World Wide Web Started in the early1990s Hyperlinks Uniform ResourceLocator (URL) Hypertext transferprotocolChapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web How a Web Page Works Hypertext Contains hyperlinks to other documents Hyperlinks Target- link to location on same document Relative-link to page within same website Absolute-link to page on another website27The World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web28The World Wide WebPage 82in yourbook Web BrowserSoftware (IE or Firefox) Interprets HTML anddisplays Web pagesand enables you to linkto other Web pagesand Web sites Also interprets: XHTML XML CSSChapter 2: Communications, Networks, the Internet, and the World Wide Web29Chapter 2: Communications, Networks, the Internet, and the World Wide Web30

The World Wide WebThe World Wide Web Multimedia on the Web Searching for Information on the Web Web pages incorporate graphics, animation, audio,video, and virtual reality Plug-ins Directory maintainedby a search enginecompany Helps find informationon the Web Search engine-findswebsites Subject directorybrowse subjects without entering keywords (seespecial feature article for this chapter)Chapter 2: Communications, Networks, the Internet, and the World Wide Web31The World Wide Web32The World Wide Web Multimedia on theWeb Multimedia on the Web Graphics Animation Used to enhance textbased Internet Graphics formatsChapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web Marquees-scrolling text across the screen Animated GIFs33The World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web34The World Wide Web Multimedia on theWeb Multimedia on theWeb Audio Video MP3, WAV, WMA,RealAudio, andQuickTime Streaming video Players Streaming audio Podcasting RSSChapter 2: Communications, Networks, the Internet, and the World Wide Web35Chapter 2: Communications, Networks, the Internet, and the World Wide Web36

The World Wide WebOther Internet Services Multimedia on the Web E-mail Virtual Reality Primary communication method for both personaland business use E-mail programs Simulation ofreal or imaginedenvironment thatappears as athree-dimensional(3-D) space VR worlds Mailbox Mail server E-mail address User nameChapter 2: Communications, Networks, the Internet, and the World Wide Web37Other Internet Services Newsgroups and Message Boards Online area in which users conduct writtendiscussions about a particular subject Usenet News server Article Posting Threaded discussion Message board FTP sites andservers Allows file downloadsand uploads Anonymous FTP FTP programs39Other Internet ServicesChapter 2: Communications, Networks, the Internet, and the World Wide Web40Other Internet Services Mailing Lists Instant Messaging See when one or morepeople are online Exchange messagesand files Join a private chatroom Text messaging Short Message Service(SMS) Group of e-mail names and addresses given asingle name Subscribing and unsubscribing LISTSERVsChapter 2: Communications, Networks, the Internet, and the World Wide Web38Other Internet Services FTP (file transferprotocol)Chapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web41Chapter 2: Communications, Networks, the Internet, and the World Wide Web42

Other Internet ServicesOther Internet Services Chat Rooms Voice Over IP (VoIP) Also called Internettelephony Uses the Internet toconnect calling parties Low cost (less than 20 a year) magicJack (providessoftware andelectronics for annualfee) Real-time conversation Chat rooms Chat clientsChapter 2: Communications, Networks, the Internet, and the World Wide Web43Netiquette Firewall Filtering software Acceptable Use Policy (AUP) The code of acceptablebehaviors users shouldfollow while on theInternet45The Impact of the Internet and theWorld Wide Web on EducationChapter 2: Communications, Networks, the Internet, and the World Wide Web46The Future of the Internetand the World Wide Web The Web will continue to evolve as the primarycommunications channel for people around theworld By 2012, more than two billion wirelesscommunication devices will be in use worldwide,and many of these products will have the ability toaccess the Web wirelessly The Web is the Gutenbergprinting press of moderntimes Collaboration with otherteachers and students ePALS New instructionalstrategiesChapter 2: Communications, Networks, the Internet, and the World Wide Web44Internet Security Internet etiquetteChapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web47Chapter 2: Communications, Networks, the Internet, and the World Wide Web48

Chapter Summary 1 of 3Chapter Summary 2 of 3 Define communications Identify the basic components of acommunications system Describe how and why network computers areused in schools and school districts Explain how the Internet works Describe the World Wide Web portion of theInternet Explain how Web documents are linked to oneanother Explain the use of Web browser software Explain how to use a Web search tool to findinformationChapter 2: Communications, Networks, the Internet, and the World Wide Web49Chapter Summary 3 of 350Teachers Discovering Computers Identify several types of multimedia products available onthe Web Explain how Internet services such as e-mail, newsgroups,chat rooms, and instant messaging work Describe the educational implications of the Internet andthe World Wide Web Describe different ways to connect to the Internet and theWorld Wide Web Describe the pros and cons of Web 2.0 tools for teachersand studentsChapter 2: Communications, Networks, the Internet, and the World Wide WebChapter 2: Communications, Networks, the Internet, and the World Wide Web51Integrating Technology andDigital Media in the Classroom6th EditionChapter 2 CompleteCommunications, Networks, theInternet, and the World Wide Web