Revision IS

Revision IS

1. Virtual memory

   • Virtual memory is used when RAM is full
   • Part of secondary storage is used as virtual memory (temporary RAM
   • Data from RAM is moved to the secondary storage to make space in the RAM for new data
   • When data in virtual memory is needed, it is moved back to the RAM
   • Disadvantage
     • Virtual memory is slower to access data compared to RAM

2. Secondary storage

   • Use the term “secondary storage” (Not hard drive) You can use the terms “data” and “programs” when writing about memory or virtual memory

3. RAM

   • Advantage
     • RAM is quicker to access data compared to virtual memory

4. Program Counter

   • Stores the address of the next instruction to be run.

5. Accumulator

   • Stores the intermediate results of a calculation

6. Memory Address Register (MAR)

   • Stores the address where the data will be fetched?written

7. Memory Data Register (MDR)

   • Stores the data or instruction which is being fetched/written from memory

8. Diagnosing patients

   • The speed in which we can access information
   • The accuracy of information in which we can access
   • How technology changes the amount of human interaction
   • How technology can’t always replace the need for humans
   • How technology can automate processes which used to take longer
   • How computer systems can identify patterns

9. Treating patients

   • How technology changes the amount of human interaction
   • How technology can’t always replace the need for humans
   • How technology can automate processes which used to take longer
   • How computer systems can identify patterns

10. Storage of records

    • The speed in which we can access information
    • How all technology can keep data secure
    • How technology can still be at risk of hacking
    • How data can be stored centrally
    • How data can be accessed in many locations around the world from different devices
    • Privacy of information

11. Peer to peer

    • All PCs have equal status (meaning there is no server managing or controlling the network)
    • They share resources with each other (they are all over the network and not in one central point)

12. Client server

    • All devices are managed/controlled by a server
    • Can install software across the network
    • Share printers with certain computers
    • Control the access of computers to the Internet

13. MAC address

    • 48 bit address
    • Work at OSI layer2 (link layer)
    • Physical adress
    • Fixed, assigned by manufacturer

14. IP address

    • 32 bit address
    • works at OSI layer 3 (network layer)
    • Logical address
    • Can change depending on the network environment