Internet and WWW Technologies
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Internet and WWW Technologies

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Internet and WWW Technologies Internet and WWW Technologies Presentation Transcript

  • INTERNET AND WORLD WIDE WEB TECHNOLOGIES BUS3500 - Abdou Illia, Spring 2007 (Week 11, Thursday 3/22/2007)
  • LEARNING GOALS
    • Identify and describe the major Internet applications.
    • Define the World Wide Web and its operation.
    • Define intranets and extranets and explain how companies use them.
  • Test 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?
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  • Brief history of the Internet Domain Name System ( DNS ) established 1984 Denial of service attack knocks out 8/15 root DNS servers 2002 A major denial of service attack brings down websites such as Yahoo!, Amazon.com, and eBay 2000 First online shopping mall, first spam email, first pizza ordered online, first advertisement banner 1994 Tim Berners-Lee creates the World Wide Web 1991 USENET newsgroups created at Duke University and the University of North Carolina 1979 Ray Tomlison invents e-mail 1971 The Defense A dvanced R esearch P rojects developed ARPANET , the precursor of the Internet 1969
  • Test 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?
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  • Accessing the Internet
  • Accessing the Internet (www)
    • Webserver 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) Network Web Browser Packet Router Packet Route Webserver Software 7
  • IP Address
    • A number that uniquely identify a computer connected to the Internet
    • Four decimal numbers separated by dots
    • Example: 128.171.17.13
    127.18.47.145 127.47.17.47
  • Domain name
    • Like a nickname given to a server
    • Two or more text “labels” separated by dots
    • Easier to remember compared to IP address
      • microsoft.com
      • eiu.edu
      • sales.microsoft.com
  • Domain Name System (DNS)
    • System for searching IP addresses based on domain names
  • Domain Name System (DNS)
  • Internet applications/services
    • E-Mail
    • File transfers
    • Instant messaging (IM)
    • Newsgroups
    • Streaming audio and video
    • Internet telephony
    • World Wide Web (WWW)
  • E-Mail
    • Most popular and widely used Internet application
    • 30 billion e-mails sent every day
      • Spam – junk e-mail messages
      • Spam costs corporate America $9 billion per year
    • Every e-mail message contains head that describes source and destination for the message
    • E-mail messages are text, but may have attachments of many types of digital data
      • Viruses often transmitted via e-mail
  • File Transfers
    • File transfer protocol (FTP)
      • Protocol providing for transmission of a file between an Internet server and a user’s computer
    • Peer-to-peer (P2P) file sharing
      • Share data from one computer to another
      • Every user can be a server and a client
      • With P2P, every user on the network can make data available to every other user on the network
      • Examples of P2P File transfer systems:
        • Napster
        • Kazaa
        • Gnutella
        • Limewire
  • Instant Messaging
    • Allows user to create a private chat session with another user
    • IM started with AOL
    • Many Web-based companies use IM technology for customer service
      • State of Virginia
      • eBay
  • Usenet Newsgroups
    • Online, bulletin board discussion forums
    • Users post and read messages
    • More than 100,000 newsgroups
    • Millions of newsgroup readers
    • Important information resource, especially for technical issues and products
  • Streaming Audio and Video
    • Creating and sending audio and video files
      • Sports
        • Men’s intercollegiate basketball at sports.yahoo.com
        • Major league baseball
      • News
        • Fox News
        • CNN radio
      • Business
        • ZDNet
      • Education
        • Warriors of the Net
      • General
        • Youtube.com
    • Also known as Podcasting
  • Internet Telephony
    • Uses Voice-over Internet Protocol (VoIP)
    • Can use your computer to make phone calls
    • Software connects computers via the Internet and transmits voice data
    • Savings comes from eliminating toll charges between locations
  • Intranets and Extranets
    • Intranet
      • Internal company network that uses Internet and WWW technologies.
      • Typical Use:
        • Finding and sharing work documents
        • Collaboration between employees to work in teams
        • Communication tool
      • Only authorized users can get access
        • Secured by firewall
    • Extranet
      • Web site that allows customers and business partners limited access to organizational intranet
      • Uses Internet and WWW technologies
      • Add additional security through the use of a Virtual Private Network (VPN)
  • Summary Questions 19
    • (a) What is an intranet? (b) What is an extranet?
    5-6
    • Name some Internet connection options available for residential users and businesses.
    7 2) (a) What does a user PC needs for accessing the World Wide Web? (b) What is needed on the webserver side? 9-11
    • (a) What is a domain name? (b) What is Domain Name System or DNS?
    12, 15, 16
    • (a) Name some Internet applications/services (b) What is Instant Messaging? (c) What is a newsgroup?
    Notes Malaga