Objectives
      Obtain the basic knowledge of computer 
        networking and the Internet
         Concepts of network applications, Internet
         Basic knowledge of network protocols: TCP/IP
      Reading assignment:
         Wikipiedia tutorials:
             http://en.wikipedia.org/wiki/Internet
             http://en.wikipedia.org/wiki/TCP/IP
         Reference book:
             Computer Networking: A Top Down Approach 
              Featuring the Internet,  5th edition. Jim Kurose, 
              Keith Ross,  Addison-Wesley,  Pearson Education, 
              2010
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               Lecture Materials
    Some of these slides are adapted from the 
      slides copyrighted by
    Jim Kurose, Keith Ross
      Addison-Wesley,  Pearson 
      Education2010. 
    Computer Networking: A Top Down 
      Approach Featuring the Internet,  5th 
      edition.
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             A Little Bit of Internet History 
       1961: Kleinrock - queueing theory shows effectiveness of packet-
         switching
       1967: ARPAnet conceived by Advanced Research Projects Agency
       1969: First ARPAnet node operational
       1972: 15 nodes in ARPAnet; First e-mail program
       1973: Metcalfe’s PhD thesis proposes Ethernet
       1974: Cerf and Kahn - architecture for interconnecting networks
       1983: deployment of TCP/IP
       1982: smtp e-mail protocol defined 
       1983: DNS defined for name-to-IP-address translation
       early 1990s: Web
       Late 1990’s – 2000’s: instant messaging, P2P file sharing; network 
         security, est. 50 million host, 100 million+ users, backbone links 
         running at Gbps
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      Cerf and Kahn’s internetworking principles:
          minimalism, autonomy - no internal 
           changes required to interconnect 
           networks
          best effort service model
          stateless routers
          decentralized control
      define today’s Internet architecture
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               What is the Internet? 
       Application Web, Email… Application
        Transport      TCP, UDP      Transport
        Network            IP         Network
                  Ethernet, cellular 
        Data Link                    Data Link
                       Physical 
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                          link