WGU C191 Chapters 10-12 Actual preparation test exam with Thorough and Correct Answers Updated 2024/2025
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WGU C191
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WGU C191
WGU C191 Chapters 10-12 Actual preparation test exam with Thorough and Correct Answers Updated 2024/2025
Operands - correct answer One or more operand registers are used to describe the parameters of the requested operation. The values are written by the CPU prior to starting the operation.
Bus...
WGU C191 Chapters 10-12 Actual
preparation test exam with Thorough
and Correct Answers Updated 2024/2025
Operands - correct answer One or more operand registers are used to describe the
parameters of the requested operation. The values are written by the CPU prior to
starting the operation.
Busy - correct answer The register (a 1-bit flag) is set by the controller to indicate
whether the device is busy or idle.
Status - correct answer The register is set by the controller to indicate the success or
failure of the last I/O operation.
Data buffer - correct answer The data buffer holds the data to be transferred between
the device and main memory. Depending on the device type, the buffer may hold a
single character or a block of data.
Programmed I/O - correct answer It is a style of I/O programming where the CPU,
running the device driver, performs the copying of all data between the I/O device
controller and main memory.
Polling - correct answer It is a technique to determine whether a device is busy or idle
by reading a flag set and reset by the device controller.
Direct memory access (DMA) controller - correct answer It is a hardware component
that allows devices to access main memory directly, without the involvement of the
CPU. Using DMA, the CPU only initiates a data transfer, which can consists of a line of
characters, a block of data, or even multiple blocks of data, as part of a single I/O
operation.
Buffer - correct answer It is a register or an area of main memory used to hold data
generated by a producer process or an input device and removed from the buffer at a
, later time by a consumer process or an output device. Depending on the intended use,
a single buffer can hold one character at a time or a larger block of data.
Buffer swapping - correct answer It is a technique that allows the operations of a
producer process and a consumer process to overlap by using two buffers. While the
producer is filling buffer 1, the consumer is copying buffer 2. When both terminate, the
two buffers are swapped. The producer starts filling buffer 2 while the consumer starts
copying buffer 1.
Circular buffer - correct answer It is a fixed array of buffer slots filled by the producer
and emptied by the consumer one slot at a time in ascending order, modulo the buffer
size.
Disk block cache - correct answer It is a set of main memory buffers that contain the
most recently accessed disk blocks.
Track - correct answer It is one of many concentric rings on a magnetic disk surface.
To access information on a track, a read/write head, mounted on a movable arm, is
mechanically positioned over the track. Information is written onto or read from the track
as the disk rotates under the r/w head.
Sector - correct answer It is a portion of a track and is the smallest unit of data that can
be read or written with a single r/w operation.
Seek time - correct answer It is the time to move the r/w head from the current position
to the track containing the desired data. The time is directly proportional to the physical
distance the r/w head needs to traverse.
Rotational delay (rotational latency) - correct answer It is the time to wait for the
desired data item to pass under the r/w head. On average, the rotational delay is one
half of the time of one disk revolution. Thus the time depends on the disk's rotational
speed.
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