Question 1: Explain in your own words what a firewall does in a computer network.

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

Question 2: Name two common examples of network security measures used to protect data.

Answer: Examples include passwords and encryption.

Question 3: Describe what a password should be like to be considered secure.

Answer: A secure password is usually long, contains a mix of uppercase and lowercase letters, numbers, and special characters, and is not easy to guess.

Question 4: Complete the truth table for an AND gate with inputs A and B and output C.

Answer: A | B | C ---|---|--- 0 | 0 | 0 0 | 1 | 0 1 | 0 | 0 1 | 1 | 1

Question 5: Complete the truth table for an OR gate with inputs A and B and output C.

Answer: A | B | C ---|---|--- 0 | 0 | 0 0 | 1 | 1 1 | 0 | 1 1 | 1 | 1

Question 6: Draw the logic circuit for a NOT gate. Label the input and output clearly.

Answer: A correct sketch would show a triangle pointing to the right with a small circle (inversion bubble) at the output, with the input entering the triangle and the output leaving the bubble.

Question 7: Sketch a logic circuit that combines an AND gate and an OR gate to produce a specific output: the output is true only when either input A is true or both inputs A and B are true. Use labels for each logic gate.

Answer: A correct sketch should show an AND gate with inputs A and B, an OR gate with inputs A and the output of the AND gate, with the final output from the OR gate.

Question 8: Explain why it is important to use strong passwords in network security.

Answer: Strong passwords are important because they make it harder for hackers to guess or crack, helping to protect personal data and prevent unauthorized access.

Question 9: Describe what encryption does to data sent over a network.

Answer: Encryption converts data into a coded form so that only someone with the correct key can read it, protecting data from being accessed by unauthorized people.

Question 10: Imagine you are designing a simple security system for a school network. List three features you would include to keep the network safe.

Answer: Features could include requiring passwords for access, using firewalls to block unwanted traffic, and encrypting sensitive data.

Question 11: Draw a simple diagram of a network with two computers connected to a router. Label each device clearly.

Answer: A correct drawing would show two computers connected to a central router, with lines indicating the connections, and each device labeled appropriately.