INTERNET AND WORLD WIDE WEB TECHNOLOGIESLEARNING GOALSTest your Internet knowledge (1)Brief history of the InternetTest your Internet knowledge (2)Accessing the InternetAccessing the Internet (www)IP AddressDomain nameDomain Name System (DNS)Slide 11Internet applications/servicesE-MailFile TransfersInstant MessagingUsenet NewsgroupsStreaming Audio and VideoInternet TelephonyIntranets and ExtranetsSummary Questions1INTERNET ANDWORLD WIDE WEBTECHNOLOGIESBUS3500 - Abdou Illia, Spring 2007(Week 11, Thursday 3/22/2007)2LEARNING GOALSIdentify and describe the major Internet applications.Define the World Wide Web and its operation.Define intranets and extranets and explain how companies use them.3Test your Internet knowledge (1)This week we saw that a network can be set in order to share software resources (like data files, databases, and programs) and hardware resources (like printers). In other words, we can say that a network can be set to provide file service, database service, and print service to users. Based on your Internet experience what kind of services users can get from the Internet?......4Brief history of the Internet1969 The Defense Advanced Research Projects developed ARPANET, the precursor of the Internet1971 Ray Tomlison invents e-mail1979 USENET newsgroups created at Duke University and the University of North Carolina1984 Domain Name System (DNS) established1991 Tim Berners-Lee creates the World Wide Web1994 First online shopping mall, first spam email, first pizza ordered online, first advertisement banner2000 A major denial of service attack brings down websites such as Yahoo!, Amazon.com, and eBay2002 Denial of service attack knocks out 8/15 root DNS servers5Test your Internet knowledge (2)Based on your Internet experience what are the different types Internet connections a residential user or a business can subscribe for?......6Accessing the Internet7Webserver needs:- Network Operating System- TCP/IP- Domain name (e.g. eiu.edu)- Internet access - IP Address (e.g. 139.67.8.3)User PC needs:- Workstation Operating System- TCP/IP- Web browser (e.g. Internet Explorer)- Internet access (e.g. thru an ISP)- IP Address (e.g. 128.150.50.9)Accessing the Internet (www)NetworkWeb BrowserPacketRouterPacketRouteWebserverSoftware78IP AddressA number that uniquely identify a computer connected to the InternetFour decimal numbers separated by dotsExample: 128.171.17.13127.18.47.145127.47.17.479Domain nameLike a nickname given to a serverTwo or more text “labels” separated by dotsEasier to remember compared to IP addressmicrosoft.comeiu.edusales.microsoft.com10Domain Name System (DNS)System for searching IP addresses based on domain names11Domain Name System (DNS)12Internet applications/servicesE-MailFile transfersInstant messaging (IM)NewsgroupsStreaming audio and videoInternet telephonyWorld Wide Web (WWW)13E-MailMost popular and widely used Internet application30 billion e-mails sent every daySpam – junk e-mail messagesSpam costs corporate America $9 billion per yearEvery e-mail message contains head that describes source and destination for the messageE-mail messages are text, but may have attachments of many types of digital dataViruses often transmitted via e-mail14File TransfersFile transfer protocol (FTP)Protocol providing for transmission of a file between an Internet server and a user’s computerPeer-to-peer (P2P) file sharingShare data from one computer to anotherEvery user can be a server and a clientWith P2P, every user on the network can make data available to every other user on the networkExamples of P2P File transfer systems:NapsterKazaaGnutellaLimewire15Instant MessagingAllows user to create a private chat session with another userIM started with AOLMany Web-based companies use IM technology for customer serviceState of VirginiaeBay16Usenet NewsgroupsOnline, bulletin board discussion forumsUsers post and read messagesMore than 100,000 newsgroupsMillions of newsgroup readersImportant information resource, especially for technical issues and products17Streaming Audio and VideoCreating and sending audio and video filesSportsMen’s intercollegiate basketball at sports.yahoo.comMajor league baseballNewsFox NewsCNN radioBusinessZDNetEducationWarriors of the NetGeneralYoutube.comAlso known as Podcasting18Internet TelephonyUses Voice-over Internet Protocol (VoIP)Can use your computer to make phone callsSoftware connects computers via the Internet and transmits voice dataSavings comes from eliminating toll charges between locations19Intranets and ExtranetsIntranetInternal company network that uses Internet and WWW technologies.Typical Use:Finding and sharing work documentsCollaboration between employees to work in teamsCommunication toolOnly authorized users can get accessSecured by firewallExtranetWeb site that allows customers and business partners limited access to organizational intranetUses Internet and WWW technologiesAdd additional security through the use of a Virtual Private Network (VPN)20Summary QuestionsMalaga Notes1) (a) Name some Internet applications/services (b) What is Instant Messaging? (c) What is a newsgroup?12, 15, 162) (a) What does a user PC needs for accessing the World Wide Web? (b) What is needed on the webserver side?73) Name some Internet connection options available for residential users and businesses.5-64) (a) What is a domain name? (b) What is Domain Name System or DNS?9-115) (a) What is an intranet? (b) What is an
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