Which of the following is most true about the dual operating mode?O The OS executes in system mode and processes execute in user mode. However, only the OS can executeunprivileged instructions.None of these choices are true.This mode was designed to optimize execution speed of OSS.Processes execute in system mode and the OS executes in the user mode.Both OSs and user processes run in the same mode.O The OS executes in system mode and processes execute in user mode. However, only the OS is allowed toexecute privileged instructions. Arrange the type of memory from fastest to slowest.O Registers, Cache, Main memory, Magnetic Disk.O Magnetic Disk, Main memory, Registers, Cache.O Main memory, Registers, Cache, Magnetic Disk.O Main memory, Cache, Registers, Magnetic Disk.O Cache, Registers, Main memory, Magnetic Disk.

Answered: Arrange the type of memory from fastest…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Which of the following is most true about the dual operating mode?
O The OS executes in system mode and processes execute in user mode. However, only the OS can execute
unprivileged instructions.
None of these choices are true.
This mode was designed to optimize execution speed of OSS.
Processes execute in system mode and the OS executes in the user mode.
Both OSs and user processes run in the same mode.
O The OS executes in system mode and processes execute in user mode. However, only the OS is allowed to
execute privileged instructions.

Arrange the type of memory from fastest to slowest.
O Registers, Cache, Main memory, Magnetic Disk.
O Magnetic Disk, Main memory, Registers, Cache.
O Main memory, Registers, Cache, Magnetic Disk.
O Main memory, Cache, Registers, Magnetic Disk.
O Cache, Registers, Main memory, Magnetic Disk.

Expert Solution

Explanation for Question 1

1) In any Operating System, it is necessary to have a dual mode operation to ensure the protection and security of the system from unauthorized or errant users.

2) This dual mode separates the User Mode from the System Mode or Kernel Mode.

3) The Instructions that can run only in System Mode or Kernel Mode are called Privileged Instructions.

4) The Instructions that can run only in user Mode are called Non-Privileged Instructions.

5) Operating system runs in system or kernel mode and it can execute the privileged instructions. Processes are created by users for their application requirements and can't execute privileged instructions

5) So option "The OS execute in system mode and the processes execute in user mode. However only OS is allowed to run privileged instructions" is correct option

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