2. Networking Road Map

• Two models: The Open System Interconnection Model (OSI) and the TCP/IP Model.
• The OSI network model

        Layer    Name             Function
             1          Physical layer        The cable or physical medium itself
             2          Data link layer       Transmit/receive packets, identify
                                       &nb sp;             H/W addresses.
             3          Network layer        Determine routing and keep accounting
             4          Transport layer      Guarantee end-to-end correct data transfer
             5          Session layer          Handle authentication and authorization
             6          Presentation layer   Deal with data problems and data
                                       &nb sp;              compression
             7          Application layer    Provide end-user services: mail, login, etc.

• The TCP/IP network model

        Layer    Name             Function
              1         Link layer            Network hardware and device drivers
              2         Network layer      Basic communication, addressing, and routing
              3         Transport layer     Communication among programs on a net
              4         Application layer   End-user application programs

• TCP/IP model with various components

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