📝 Port scanning is a System and Network Threats

📖 From Operating System • 15. Security • 12 questions available

Practice MCQs for Port scanning is a System and Network Threats. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

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📝 Sample Questions

Q1. What is the term for an attacker pretending to be another host?

🔹 A. Masquerading

🔹 B. Spoofing

🔹 C. Sniffing

🔹 D. Phishing

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does a stealth FIN scan often evade detection by stateful firewalls?

🔹 A. Firewalls treat FIN packets as part of an established connection

🔹 B. Firewalls ignore all TCP flags except SYN

🔹 C. FIN scans use raw sockets that bypass inspection

🔹 D. Firewalls block FIN packets entirely

💡 Difficulty: medium | ✅ Correct: B

Q3. A host blocks all inbound SYN packets but allows inbound ACK packets. Which scanning technique would you employ to discover open ports, and why?

🔹 A. SYN scan

🔹 B. ACK scan

🔹 C. FIN scan

🔹 D. Xmas scan

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 The Security Problem in Operating System 📝 Program Threats in Operating System 📝 Trojan horse 📝 Trap door 📝 Logic bomb

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