Topic 1

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  • Networks
    • Factors when choosing a network
      • Cost
      • Size
      • Usage
      • Existing Systems
      • Performance
      • Security
    • Peer to Peer
      • Advantages
        • Cost saving
        • No network manager needed
        • Easy to set up
        • No need to rely upon a server
        • Low operating costs
        • Peer resonsibilty
      • Disadvantage
        • No central back up store
        • Poor Security
        • Users need more IT knowledge
        • Computers may run slow if all users access the same resource
        • Only suitable for small networks (15 or less)
    • Client Server
      • Advantages
        • Fault tolerant
        • Load tolerant
        • Better security
        • Centralised data
        • Backups made by central server at regular intervals
        • Centralised admin
        • Faster access to programmes
      • Disadvantage
        • Much more expensive
        • Needs a network manager
        • Complex and sophisticated software is required
        • If the server breaks down the whole network goes down
    • Typologies
      • Ring
        • Advantages
          • Network doesn't depend on a central server
          • Every computer has the same access rights
        • Disadvantage
          • Faults are difficult to locate
          • If there is a break in the connection the whole network goes down
          • Cannot keep equipment running whilst equipment is added or removed from the network
      • Bus
        • Advantages
          • Cost effective as you only need a small amount of cable
          • Simple cable run makes it easy to install
        • Disadvantage
          • If more than 12 devices are connected then the network will run slow
          • If there is a break in the backbone/main cable then all connected devices don't operate
      • Star
        • Advantages
          • Fault tolerant
          • Load tolerant
          • Easy to add extra computers
        • Disadvantage
          • High initial start up cost
          • Dependent upon the central hub
    • Wi-Fi
      • Advantage
        • Network can be set up without having to use lots of expensive cables
        • People can work from anywhere as long as they can receive a wireless radio signal
        • Ideal for old building where cables are not allowed to be installed
        • You can use WI-FI all over the wolrd
        • Can add devices quickly and easily
      • Disadvantage
        • Using WI-FI drains a lot of power on the device
        • May be health problems
        • Home network have a limited range (150ft)
        • Can get interference from other radio signals
        • Further you are away from the router theslower the speed
        • Data is not as secure when sent via radio signals as opposed to cables

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