📝 Transforming I/O Requests to Hardware Operations

📖 From Operating System • 13. I/O Systems • 24 questions available

Practice MCQs for Transforming I/O Requests to Hardware Operations. 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 does DMA stand for?

🔹 A. Direct Memory Access

🔹 B. Dynamic Memory Allocation

🔹 C. Disk Management Architecture

🔹 D. Data Management Access

💡 Difficulty: easy | ✅ Correct: A

Q2. In a protected‑mode operating system, why are processes prevented from issuing device commands directly?

🔹 A. To reduce power consumption

🔹 B. To enforce access‑control policies and avoid accidental crashes

🔹 C. To simplify driver development

🔹 D. To increase cache size

💡 Difficulty: medium | ✅ Correct: B

Q3. What are the security implications if a kernel without memory protection allows processes direct DMA access?

🔹 A. There are none; DMA is inherently safe

🔹 B. Processes could read or write arbitrary physical memory, leading to data leakage or system crashes

🔹 C. DMA will automatically encrypt all transferred data

🔹 D. The system will run faster with no security concerns

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Overview of I/O Systems 📝 I/O Hardware in I/O Systems 📝 Polling in I/O Hardware 📝 Interrupts in I/O Hardware 📝 Direct memory access in I/O Hardware

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