1.4 The Internet

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  • 1.4 The Internet
    • Interconnected networks, scanning the world
      • Networks are made when computers and other devices are connected
      • Internet now conveys information via sound and video
      • Internet may be considered to be a number of networks, each joined to other networks
    • Internet connections
      • Copper-cable based on electrical conductivity
      • Optical fibre uses strands of glass and data is transferred as pulses of light
    • Characteristics
      • Speed of data transfer differ for internet connections
        • Copper cable has a low bandwidth and is slower
      • Range is the distance over which a signal can be sent on each type of connection
        • Satellites send signals from space
        • Microwaves send to devices that are in direct line of sight

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