Multiple Choice Questions 10
Question1
An example of the key differences that can exist across (and even in) classes of I/O devices is:
选择一个答案
a. Error conditions |
b. Data rate |
c. Data representation |
d. All of the above √ |
Question2
The following disk scheduling policy is useful as a benchmark against which to evaluate other disk scheduling policies because it provides a worst-case scenario:
选择一个答案
a. Priority scheduling |
b. FIFO scheduling |
c. None of the above |
d. Random scheduling √ |
Question3
The disk scheduling algorithm that implements two subqueues in a measure to avoid the problem of “arm stickiness” is the:
选择一个答案
a. All of the above |
b. FSCAN policy √ |
c. N-step-SCAN policy |
d. C-SCAN policy |
Question4
Which of the following RAID levels implement some form of parity calculation to introduce redundancy:
选择一个答案
a. RAID Level 4 |
b. RAID Level 6 |
c. All of the above √ |
d. RAID Level 2 |
Question5
The disk cache replacement strategy that replaces the block that has experienced the fewest references is called:
选择一个答案
a. Least Referenced (LR) |
b. Least Frequently Used (LFU) √ |
c. All of the above |
d. Least Recently Used (LRU) |
Question6
In a UNIX system, which of the following types of I/O devices make use of character queues:
选择一个答案
a. Communications lines √ |
b. Tape drive |
c. All of the above |
d. Disk drive |
Question7
In a W2K system, the I/O manager module that includes lazy write and lazy commit services to improve overall performance is the:
选择一个答案
a. Hardware device drivers |
b. File system drivers |
c. Cache manager √ |
d. None of the above |
Question8
The I/O technique where the processor busy waits for an I/O operation to complete is called:
选择一个答案
a. Direct memory access (DMA) |
b. Programmed I/O √ |
c. Interrupt-driven I/O |
d. None of the above |
Question9
The system configuration that includes an I/O module which is a separate processor with a specialized instruction set can be referred to using the following terminology:
选择一个答案
a. Direct Memory Access (DMA) |
b. All of the above √ |
c. I/O Channel |
d. I/O Processor |
Question10
The bus configuration for DMA that provides no path other than the system bus between the DMA module(s) and I/O devices is:
选择一个答案
a. I/O bus |
b. Single bus, detached DMA √ |
c. Single bus, integrated DMA-I/O |
d. None of the above |
Question11
The primary objective in designing the I/O facility of a computer system that deals with the desire to handle all I/O devices in a uniform manner is referred to as:
选择一个答案
a. Directory management |
b. Generality √ |
c. None of the above |
d. Efficiency |
Question12
In a hierarchical structure for managing I/O on a secondary storage device that supports a file system, the layer that is closest to the hardware is the:
选择一个答案
a. Device I/O layer |
b. None of the above √ |
c. Physical organization layer |
d. Directory management layer |
Question13
An example of a block-oriented I/O device is:
选择一个答案
a. Modem |
b. All of the above |
c. CD-ROM √ |
d. Printer |
Question14
The scenario where multiple buffers are used in an attempt to alleviate the problem of absorbing rapid bursts of I/O is typically referred to as:
选择一个答案
a. None of the above |
b. Double buffering |
c. Circular buffering √ |
d. Single buffering |
转播
