Operating System Security Measures
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Questions and Answers

What is the purpose of the OS protection boundary?

  • To limit the number of processes that can run concurrently
  • To enhance the speed of file operations
  • To restrict user applications from accessing privileged resources (correct)
  • To prevent the CPU from executing system calls
  • In what mode does the CPU execute when the Privileged Mode bit is set to 0?

  • User mode (correct)
  • Exception mode
  • Interrupt mode
  • Kernel mode
  • What action is taken when an application makes a system call?

  • The kernel checks if the caller has permission for the requested operation (correct)
  • The system call is delayed for future execution
  • CPU executes the system call directly
  • The application is terminated immediately
  • Which component is responsible for handling system calls in the OS?

    <p>CPU</p> Signup and view all the answers

    What stage does the CPU enter after executing a system call and returning from it?

    <p>Privileged Mode</p> Signup and view all the answers

    What is the purpose of the instruction trap in an operating system?

    <p>To handle errors and exceptions in instruction execution</p> Signup and view all the answers

    Which component is responsible for managing memory allocation in an operating system?

    <p>Main Memory</p> Signup and view all the answers

    What happens when an interrupt occurs during CPU execution?

    <p>The CPU pauses its current task to process the interrupt</p> Signup and view all the answers

    Which component assists in transferring control to an appropriate exception handler when an exception occurs?

    <p>Interrupt Dispatch Table</p> Signup and view all the answers

    What role does the OS protection boundary play in ensuring system stability?

    <p>It improves security by protecting memory regions.</p> Signup and view all the answers

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