Question 1: Explain two common methods used to secure data transmitted over a computer network.

Answer: Methods include encryption, which encodes data to prevent unauthorized access, and firewalls, which monitor and control incoming and outgoing network traffic based on security rules.

Question 2: Describe what a firewall does in a network security context.

Answer: A firewall acts as a barrier that filters network traffic, blocking unauthorized access while allowing legitimate data through based on predefined security rules.

Question 3: What is the purpose of using passwords and authentication in network security?

Answer: Passwords and authentication verify the identity of users trying to access the network, ensuring only authorized individuals can access sensitive information.

Question 4: Complete the truth table for the AND logic gate with inputs A and B. Fill in the output column.

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

Question 5: Complete the truth table for the OR logic gate with inputs A and B. Fill in the output column.

Answer: A | B | Output ---|---|------- 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 with a small circle at the output representing the NOT operation, with input entering the triangle and output leaving the circle.

Question 7: Draw the logic circuit for an AND gate with two inputs.

Answer: A correct sketch would depict a D-shaped symbol with two inputs on the left side and one output on the right side, with labels for clarity.

Question 8: Describe a scenario where a network might be vulnerable to security threats and suggest a way to prevent it.

Answer: A network could be vulnerable to phishing attacks where users are tricked into revealing passwords. To prevent this, users should be trained to recognize phishing attempts and use multi-factor authentication.

Question 9: Explain the role of encryption in protecting data in a network.

Answer: Encryption converts data into a coded form that can only be read by someone with the correct decryption key, preventing unauthorized access during transmission.

Question 10: Sketch a simple diagram of a basic network security system that includes a firewall and a secure server.

Answer: A correct sketch would show a network with an external internet connection, a firewall device filtering traffic, and a secure server behind the firewall receiving and sending data.