ICT stuff

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  • Created by: Josh98
  • Created on: 11-03-15 11:00
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  • Networking
    • Basic Elements of ICT networking
      • data transfer media
      • networking software
      • standards and procedures
      • comunication devices
    • comunication devices
      • Hubs
        • a simple device which connects all computers in one network & allows file sharing
      • Switches
        • in a similar way to hubs they are used to join multiple computer's together but contain more intelligence that a hub
      • Network interface cards
        • computer must have one of these to be connected to a network.
        • contains circuity along with a socket
          • socket allows the connection between the computer and the cabling
          • slotted into the motherboard
        • prepares data for sending over the network, sends the data and controls data flow
      • Routers
        • devices that join wired or wireless networks together, often act as gateways to the internet from small home computers
    • network operating system software
      • UNIX
      • Novell Netware
      • Linux
    • network management software
      • ensure software is up to date
      • keep track of software being run
      • provides remote control facilities for staff
      • checks bandwidth is used correctly
      • checks the speed of the processor
    • Data Transfer
      • metal wires
        • unshielded twisted pair
          • thin wires that are twisted to cancel out interference
          • thin wire means easier installation
          • only suitable for small networks
        • shielded twisted pair
          • wires have copper braiding which protects the data signals from outside corruption
          • more expensive due to the shielding
          • greater transmission speed than unshielded
      • Fibre optic cable
        • advantages
          • faster speed
          • lots of data through a small cable
          • no  metal interference
        • drawbacks
          • costs are a lot more expensive that metal cable
      • wireless
        • wireless connection to an LAN allows the user to use the internet up to the range that the router allows
  • How Wifi Works
    • the router is connected to the internet by a high speed broadband connection
      • router receives data from the internet
        • it transmits the data as a radio signal using antenna
          • the computers wireless adapter picks up the signal and turns the radio signal into data that the computer can understand
    • advantages of wifi
      • allows inexpensive LANS to be set up without cables
      • allows freedom of working via a signal
      • good for old building where cables cannot be installed
      • used globally
    • drawbacks of wifi
      • high power consumption
      • health problems using wifi
      • security problems e.g. hackers
      • interference

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