ETEC Exam Review - Operating Systems

When CPU is executing the system call, the system is in _______ kernel mode user mode both kernel and user mode neither kernel nor user mode

• kernel mode

• user mode

• both kernel and user mode

• neither kernel nor user mode

What is a characteristic of a privileged state in an operating system? Limited access to system resources Full access to system resources Restricted execution of privileged instructions Equal access as non-privileged states

• Limited access to system resources

• Full access to system resources

• Restricted execution of privileged instructions

• Equal access as non-privileged states

Which of the following statements is TRUE about non-privileged states? Non-privileged states have unrestricted access to system resources. Non-privileged states can execute privileged instructions. Non-privileged states operate with limited access to certain resources. Non-privileged states have higher security privileges.

• Non-privileged states have unrestricted access to system resources.

• Non-privileged states can execute privileged instructions.

• Non-privileged states operate with limited access to certain resources.

• Non-privileged states have higher security privileges.

What is the purpose of having privileged and non-privileged states in an operating system? To simplify user interactions To improve system performance To enhance security and control access to critical resources To ensure backward compatibility

• To simplify user interactions

• To improve system performance

• To enhance security and control access to critical resources

• To ensure backward compatibility

Which term is commonly used to describe a switch from non-privileged to privileged mode in a processor? Context switch Priority inversion System call Interrupt

• Context switch

• Priority inversion

• System call

• Interrupt

In a multi-user operating system, why is it important to have privileged and non-privileged states? To increase system complexity To allow users full control over the system To prevent users from interfering with each other and the system To provide additional features to non-privileged users

• To increase system complexity

• To allow users full control over the system

• To prevent users from interfering with each other and the system

• To provide additional features to non-privileged users

Which mode does the CPU operate in when executing user applications? Non-privileged mode Kernel mode Supervisor mode Protected mode

• Non-privileged mode

• Kernel mode

• Supervisor mode

• Protected mode

What is a common method for a user-level program to request services from the operating system in a non-privileged state? System call Interrupt Exception I/O operation

• System call

• Interrupt

• Exception

• I/O operation

Which of the following is an advantage of having privileged states in an operating system? Increased user flexibility Simplified hardware design Enhanced system security Improved graphical user interface

• Increased user flexibility

• Simplified hardware design

• Enhanced system security

• Improved graphical user interface

Which component of the operating system is responsible for handling privileged instructions? Scheduler Kernel Device driver File system

• Scheduler

• Kernel

• Device driver

• File system