Topic: Cryptography and Network Security
Which of the following can be protected using a firewall?
- A. Dumpster Diving
- B. Physical Theft
- C. Shoulder Surfing
- D. Network Scanning
Answer: D. Network Scanning
Explanation: A firewall is a network security device designed to monitor and filter incoming and outgoing network traffic. It can be configured to detect, log, and block malicious network scanning (like port scanning). The other options (Dumpster Diving, Physical Theft, Shoulder Surfing) are physical or social engineering threats that a firewall cannot mitigate.