Computer studies.

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  • Computer science.
    • Networks.
      • LAN's and WAN's.
        • LAN is a local area network, it covers a small geographical area. They are owned by an organisation such as a busines.
        • WAN is a wide area network, they cover large geographical areas such as over sea. Example is the internet.
      • Factors that affect network performance.
        • Band width is the amount of data that can be transferred in a given time.
        • Wired connections are usually faster and are more reliable.
        • The type of cable and network topology used.
      • Hardware.
        • Network interface controller.
        • Routers.
        • Cabels
          • CAT 5
          • CAT 6
          • Fibre optic.
    • Components of a computer system.
      • The CPU which is then central processing unit.
      • The CPU had three main components, the control unit (CU). The arithmetic logic unit (ALU). The cache.
        • The CU is the overall control unit of the CPU. It executes the program instruction.
        • The ALU does all of the calculations, also preforms all of the logic operations.
        • The cache is a very fast from of CPU memory, it is even faster than the RAM.
      • Fetch-Decode-Execute cycle.
        • Fetch: Copy memory address.
        • Decode: The instructions are decoded by the CU.
        • Execute: The instruction is preformed.
    • Algorithms
      • Pseudocode
        • This is not an actual programming language
        • It is also not a real human language.
        • It is a mid point between them so that it is almost code but it is readable to other people.
      • Flow diagrams
        • These show the sequence in which something should be solved in.
    • Issues.
      • Legal issues are about what's actually right and wrong in the eyes of the law.
      • Cultural issues are about how how groups of people with particular, beliefs, practices or languages may be affected.
      • Environmental issues are about how we impact the natural world.
      • Stake holder are individuals or groups that have an interest in a particular scenario such as a new technology.
      • E-waste is the name given to the desposal of technology such as mobile phones and computers.
    • Data protection act.
      • Data must only be used in a fair and lawful way.
      • Data must only be used for the specified purpose.
      • Data should be adequate, relevant and not excessive for the specified use.
      • Data must be accurate and kept up to date.
      • Data should be kept no longer than is necessary.
      • The rights of the data subject must be observed.
      • Data should be kept safe and secure.
      • Data should not be transferred abroad without adequate protection.
  • Topologies.
    • Star topology all devices are connected to a central switch.
    • Bus topology all devices are connected to a backbone cable  with terminators at the end.
    • Ring topology all the data in the network goes around in a loop.
    • Full mesh every devices has a connection to another device, they are all joined together.
    • Partial mesh nearly all of the devices are connected to another,
  • Search algorithms.
    • Binary search looks at the middle number of a sorted list and removes the half that is going to be either to high or to low.
    • Linear search looks through every item until the correct number is found.
  • Sorting algorithms.
    • Bubble sort picks the first two numbers and switches them when in the correct order small to high.

Comments

Lydia Walter

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Simply fantastic. I was searching for a suitable resource to help my daughter who has struggled with this topic and this has been an amazing help. Thank you so much! God's work!

Lluvia Martes

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Such a brilliant breakdown of the topics. It really helps to connect all of these components of computer science and displays them in a fun, visually appealing way. It is easy to see the time and effort that was put into this - well done! Extremely helpful!

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