Question 1: Define what a computer network is in your own words.

Answer: A computer network is a group of computers connected together so they can share information and resources.

Question 2: Name two devices that are commonly used to connect computers in a network.

Answer: Router and switch.

Question 3: Explain why passwords are important for computer security.

Answer: Passwords protect accounts and information from unauthorized access by ensuring only the owner can access their data.

Question 4: Describe a simple way to keep your personal information safe online.

Answer: Use strong, unique passwords and do not share personal details on untrusted websites.

Question 5: What is a firewall and how does it help protect a network?

Answer: A firewall is a security system that monitors and controls incoming and outgoing network traffic based on security rules, helping to block malicious access.

Question 6: Complete the truth table for the AND logic gate below:

Answer: A truth table for AND: | Input 1 | Input 2 | Output | |---------|---------|--------| | 0 | 0 | 0 | | 0 | 1 | 0 | | 1 | 0 | 0 | | 1 | 1 | 1 |

Question 7: Sketch a simple diagram of a network that includes two computers connected to a router, which is connected to the internet.

Answer: A correct sketch would show two computers connected via lines to a central device labeled 'Router', with the router connected to a cloud or symbol representing the internet.

Question 8: Draw a simple logic circuit that uses an OR gate and an AND gate to combine two inputs. Label each gate clearly.

Answer: A correct diagram would show two inputs feeding into an OR gate and the same two inputs feeding into an AND gate; the outputs of these gates then feed into a final output line.

Question 9: Identify and explain one way to prevent viruses from infecting your computer.

Answer: Install and regularly update antivirus software to detect and remove malicious programs.

Question 10: Describe what encryption is and why it is used in online security.

Answer: Encryption is converting data into a secret code to protect it from being read by unauthorized people during transmission or storage.