Question 1

Explain the difference between a serial-port controller and a SCSI bus controller.

Accepted Answer

A serial-port controller is a simple dev...

Question 2

What are the three reasons that buffering is performed?

Accepted Answer

A buffer is a memory area that stores da...

Question 3

A dedicated device cannot be used concurrently by several processes or threads.

Accepted Answer

A) True 
 B)False

Question 4

Vectored IO allows one system call to perform multiple IO operations involving a single location.

Accepted Answer

A) True 
 B)False

Question 5

What is the purpose of a programmable interval timer?

Accepted Answer

The programmable interval timer is hardw...

Question 6

In polling I/O, the main inefficiency comes from

Accepted Answer

A)   the hardware controller when it notifies the CPU that the device is ready for service.
B)   the basic polling operation that may be comprised of several CPU instructions.
C)   polling when it is attempted repeatedly yet rarely finds a device ready for service.
D)   the slow data transfer rate between a device and the host.

Question 7

In memory-mapped I/O

Accepted Answer

A)   main memory of the computing device is used for communicating with the I/O devices using the standard I/O instructions.
B)   main memory of the computing device is used for communicating with the I/O devices using the special I/O instructions.
C)   address space of the computing device is used for communicating with the I/O devices using the standard I/O instructions.
D)   address space of the computing device is used for communicating with the I/O devices using the special I/O instructions.

Question 8

Escape (or back door)  in application I/O interface

Accepted Answer

A)   allows a user to interrupt a device at any time.
B)   allows access to a few additional devices, such as a time-of-day clock and a timer.
C)   transparently passes arbitrary commands from an application to a device driver.
D)   enables managing of devices with widely varying speeds ranging from a few bytes per second to gigabytes per second.

Question 9

What is interrupt chaining?

Accepted Answer

Interrupt chaining is a technique in whi...

Question 10

A current trend in I/O device technology and I/O subsystem is

Accepted Answer

A)   there is an increasingly broad variety of I/O devices.
B)   new devices are similar to the previous I/O devices that makes it easier to incorporate them in operating systems.
C)   to encapsulate the oddities of different I/O devices, the device drivers present device-specific interface for each device to the I/O subsystem.
D)   All of the above.

Exam 12: Io Systems

A dedicated device cannot be used concurrently by several processes or threads.

Correct Answer
verified

A current trend in I/O device technology and I/O subsystem is

Correct Answer
verified

In polling I/O, the main inefficiency comes from

Correct Answer
verified

What is the purpose of a programmable interval timer?

Correct Answer
verified
The programmable interval timer is hardw...
View Answer

In memory-mapped I/O

Correct Answer
verified

Vectored IO allows one system call to perform multiple IO operations involving a single location.

Correct Answer
verified

What are the three reasons that buffering is performed?

Correct Answer
verified
A buffer is a memory area that stores da...
View Answer

What is interrupt chaining?

Correct Answer
verified
Interrupt chaining is a technique in whi...
View Answer

Explain the difference between a serial-port controller and a SCSI bus controller.

Correct Answer
verified
A serial-port controller is a simple dev...
View Answer

Escape (or back door) in application I/O interface

Correct Answer
verified

Exam 12: Io Systems

A dedicated device cannot be used concurrently by several processes or threads.

Correct AnswerverifiedShow Answer

A current trend in I/O device technology and I/O subsystem is

Correct AnswerverifiedShow Answer

In polling I/O, the main inefficiency comes from

Correct AnswerverifiedShow Answer

What is the purpose of a programmable interval timer?

Correct AnswerverifiedThe programmable interval timer is hardw...View AnswerShow Answer

In memory-mapped I/O

Correct AnswerverifiedShow Answer

Vectored IO allows one system call to perform multiple IO operations involving a single location.

Correct AnswerverifiedShow Answer

What are the three reasons that buffering is performed?

Correct AnswerverifiedA buffer is a memory area that stores da...View AnswerShow Answer

What is interrupt chaining?

Correct AnswerverifiedInterrupt chaining is a technique in whi...View AnswerShow Answer

Explain the difference between a serial-port controller and a SCSI bus controller.

Correct AnswerverifiedA serial-port controller is a simple dev...View AnswerShow Answer

Escape (or back door) in application I/O interface

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The programmable interval timer is hardw...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A buffer is a memory area that stores da...
View Answer

Correct Answer
verified
Interrupt chaining is a technique in whi...
View Answer

Correct Answer
verified
A serial-port controller is a simple dev...
View Answer

Correct Answer
verified