Question

1 ) Which of the followings is not a goal of the I/O software?   

A. Device independence

B. Uniform naming

C. Buffering

D. Error handling

E. Cost reduction

2) According to the data rate, which of the following is not true?

A. SONET OC-768 network is faster than Gigabit Ethernet

B. FireWire 800 is slower than USB 3.0

C. SCSI Ultra 5 bus is faster than Thunderbolt 2 bus

D. Keyboard is slower than mouse

3) Which of the following is not a character device?

A. disk

B. keyboard

C. mouse

D. printer

4) The main purpose of adapting RAID (Redundant Array of Inexpensive/Independent Disks) is

A. to increase the capacity of disk

B. to improve the hard disk performance and the fault tolerance

C. to allow the data to be stored in an encrypted format    

D. to reduce the cost

E. Your answer: ___________________________________________________________

Answer 1

Answers:

1) cost reduction

It is not a goal of the l/o software

The rest of the options are the goals of the I/o software

Like error handling ,device independence, uniform naming and buffering

It does don't have a goal of reducing the cost

Uniform naming is done in the I/o software in a way that user does not have aware of hardware name

And it has buffering in which data entering into the system cannot store directlyin memory

And errors are handled by the controller and it has device independence

And it does not look after the cost reduction.

2)SCSI ultra 5 bus is faster than Thunder bolt 2 bus

It is the false statement according to the data rates and rest of the options are true

As Thunder bolt2 bus is the fastest among most

And SCSI ultra 5 bus is slower than the thunderbolt 2

And rest of the obtions are correct beacuse

Key board has low data rate than mouse so keyboard is slower than mouse.

And FireWire 800 is slower than usb3.0

It is true beacuse,usb 3.0 is advanced version with increasing data rate of usb 2.0 , previously FireWire 80/ use to be faster than usbs but ,usb3.0 which increased data rate is faster than FireWire 800

And socnet oc-768 is faster than gigabit ethernet as it has 1gbps which is slower than socnet oc_768

3)disk

Disk is not character device

First we have to know what is character device ,it is device which donot have the physical storage or addressable media

Disk has storage or addressable media

Where key board,mouse and printer doesn't have storage media so they are character device.

4)to improve the performance and the fault tolerance

It is main purpose of adapting RAID

Raid main features is to improve the performance and reliability

Reliability which includes the fault tolerance

It does not mainly concentrates on cost reduction, capacity of the disk

Or for encrypted format

It mainly focus on speed that is performance and fault tolerance.