Technology in Action
                            Technology in Action
                                                Chapter 7
                                                Chapter 7
                                Networking and Security: 
                                Networking and Security: 
                     Connecting Computers and Keeping 
                     Connecting Computers and Keeping 
                    Them Safe from Hackers and Viruses
                     Them Safe from Hackers and Viruses
        © 2009 Prentice-Hall, Inc.                                                                           2
                                   Chapter Topics
                                    Chapter Topics
        • Networking fundamentals
            Networking fundamentals
        • Network architecture
            Network architecture
        • Network components
            Network components
        • Peer-to-peer networks
            Peer-to-peer networks
        • Ethernet networks
            Ethernet networks
        • Computer threats
            Computer threats
        • Computer safeguards
            Computer safeguards
        • Computer viruses
            Computer viruses
        © 2009 Prentice-Hall, Inc.                                                                           3
          Networking Fundamentals
          Networking Fundamentals
   • Computer network:
      Computer network:
      –Two or more computers connected together
        Two or more computers connected together
      –Devices connected to networks: nodes 
        Devices connected to networks: nodes 
   • Benefits of a network:
      Benefits of a network:
      –Sharing resources
        Sharing resources
      –Transferring files
        Transferring files
    © 2009 Prentice-Hall, Inc.                             4
               Network Architecture
               Network Architecture
    • Network designs:
       Network designs:
        –Locally administered:
          Locally administered:
           • Peer-to-peer (P2P)
             Peer-to-peer (P2P)
        –Centrally administered:
          Centrally administered:
           • Client/server
             Client/server
    © 2009 Prentice-Hall, Inc.                                5
                       Peer-to-Peer Networks
                       Peer-to-Peer Networks
        • Nodes communicate 
            Nodes communicate 
            with each other:
            with each other:
             –Peers
                 Peers
        • Share peripheral 
            Share peripheral 
            devices
            devices
        • Used in home and 
            Used in home and 
            small office networks 
            small office networks 
        © 2009 Prentice-Hall, Inc.                                                                           6