📝 Trap and emulate in Building Blocks

📖 From Operating System • 16. Virtual Machines • 10 questions available

Practice MCQs for Trap and emulate in Building Blocks. 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 primary purpose of a trap-and-emulate mechanism in a virtualized system?

🔹 A. To intercept privileged instructions and emulate them safely

🔹 B. To increase network bandwidth

🔹 C. To store data in persistent memory

🔹 D. To encrypt virtual machine images

💡 Difficulty: easy | ✅ Correct: A

Q2. How does trap-and-emulate affect the performance trade‑off compared to binary translation?

🔹 A. It generally yields lower latency for I/O‑intensive workloads

🔹 B. It eliminates the need for any virtualization overhead

🔹 C. It provides exact hardware timing at the cost of increased CPU usage

🔹 D. It simplifies guest OS development but adds overhead for each trapped instruction

💡 Difficulty: medium | ✅ Correct: D

Q3. A security analyst discovers that a malicious VM repeatedly triggers traps for CPUID instructions to fingerprint the host. Which mitigation technique best limits this attack?

🔹 A. Disable all CPUID instructions for guests

🔹 B. Introduce random delays in the trap handler

🔹 C. Patch the guest OS to ignore CPUID results

🔹 D. Encrypt the CPUID output with a secret key

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Overview Virtual Machines 📝 History Virtual Machines 📝 Benefits and Features Virtual Machines 📝 Building Blocks in Virtual Machines 📝 Binary translation

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