PPE revision

PPE revision

1. Amount of RAM

   • Than more amount of RAM than more programs can be opened at the same time without affecting perfomance

2. CPU - Clock speed, cache, number of cores

   • CPU with a higher clock speed will have more fetch decode execute cycles can be processed per second
   • CPU that have more cache will access frequently used data quicker.
   • CPU with more cores will processed more instructions at once

3. Type of Hard drive

   • SSD
     • SSD - have better read/write speed, better durability. More cost and less capacity
   • HDD
     • Will have a much slower read/write speed, loss durability but more cheaper and have better capacity

4. factors that affect the performance of computers

5. Client-server network

   • What is it? A client-server network is a communications model in which multiple client programs share the services of a common server program.
   • 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
   • Why it is better than peer to peer network? Keep track of files, perform backups , install and update software , manage network security / user access levels / anti malware software

6. Peer to peer network

   • peer-to-peer network, all computers have equal status. There are no servers or clients. Peers store their own files, which can be accessed by other peers on the network

7. Protocols are a set of rules for how computers should communicate across a network

8. Constructs

   • Sequence a set of instructions in order
   • Selection instructions which which will run depending on a condition being true or false. ( gives choice else, else if)
   • Iteration Instructions which can repeat (either a set number of times or depending on a condition being true or false)

9. DIV ): Uses floor division to return an integer value. MOD : Returns the remainder after division

10. Standards

    • technical publication created to ensure the reliability of the materials, products, methods, and/or services

11. WANs

    • networks are connected over a large geographical area. WANs connect using a modem.

12. LANs

    • A LAN is when devices are connected over a small geographical area You can connect to a LAN using WiFi or Ethernet

13. WPANs

    • A WPAN allows us to pair devices together over a short range. Connected by bluetooth

14. Truth Tables / logic gates

    • Truth table show output for each possible input
    • OR gates
    • AND gates
    • Not gates

15. What affects on performance of the network?

    • Bandwidth
    • WAP
    • Number of users
      • If so big number of users therefore slower transmission data, more time used to transmitted data. Router/Switch/ Central device would have more requests therefore run slowly
    • Using Wi-Fi or Ethernet
    • Quality of hardware

16. User interfaces

    • CLI ( Command line interface)
      • Cons. It is takes less memory than GUI, don't need windows for run, have less resolution
      • Can be difficult for new users, if you make mistake in command, it is will not work, very large of the command that you need to learn
    • GUI ( graphical user interface
      • Cons. It is easier to use for most amount of users, it is have visual interface , it is interactive.
      • Pros. It is takes much more CPU memory than CLI