Saudi Secondary School Certificate · Computer Science and Digital Skills

Networks, security and data

18 practice questions, each with the answer and an explanation.

Practise Networks, security and data now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 18 questions

  1. How many usable host addresses are in a network with prefix /30?
  2. How many usable host addresses are in a network with prefix /25?
  3. How many usable host addresses are in a network with prefix /29?
  4. How many usable host addresses are in a network with prefix /24?
  5. How many usable host addresses are in a network with prefix /26?
  6. How many usable host addresses are in a network with prefix /27?
  7. How many different values can be stored using 9 bits?
  8. How many different values can be stored using 8 bits?
  9. What is the purpose of a firewall?
  10. What is the time complexity of accessing an array element by index?
  11. Which sorting algorithm repeatedly swaps adjacent elements that are in the wrong order?
  12. Which SQL clause filters rows?
  13. What is the data type of the value 3.14 in Python?
  14. Which layer of the OSI model is responsible for routing packets between networks?
  15. What is the purpose of the CPU's control unit?
  16. Which of these is an example of an open-source operating system?
  17. What does a hash function do to a password before it is stored?
  18. What is the main advantage of using a function in a program?

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