📝 Program Threats in Operating System

📖 From Operating System • 15. Security • 8 questions available

Practice MCQs for Program Threats in Operating System. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-27

Easy Questions

Medium Questions

Hard Questions

📝 Sample Questions

Q1. What is a Trojan horse in the context of program threats?

🔹 A. A type of malware that encrypts files

🔹 B. A program that appears legitimate but contains hidden malicious code

🔹 C. A firewall configuration

🔹 D. An authentication protocol

💡 Difficulty: easy | ✅ Correct: B

Q2. How does a back‑door daemon left by an attacker differ from a typical Trojan horse?

🔹 A. A back‑door provides persistent remote access, while a Trojan horse only executes once

🔹 B. A back‑door runs invisibly after installation, whereas a Trojan horse may be noticed by users

🔹 C. A back‑door is a hardware component, while a Trojan horse is software

🔹 D. A back‑door encrypts data, whereas a Trojan horse steals it

💡 Difficulty: medium | ✅ Correct: C

Q3. A system uses password authentication, but a Trojan horse logs keystrokes to capture passwords. Which layered defense most effectively reduces this risk?

🔹 A. Multi‑factor authentication requiring a second token

🔹 B. Enforcing complex password policies

🔹 C. Regularly applying software patches

🔹 D. Isolating the system on a separate VLAN

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 The Security Problem in Operating System 📝 Trojan horse 📝 Trap door 📝 Logic bomb 📝 Stack and buffer overflow

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