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Understanding Operating Systems – Extra Questions

Buffers are used to synchronize the movement of data between the relatively slow I/O devices and the very fast CPU.
True
Typically, a host at one site, called the client, has resources that a host at another site, called the server, wants to use.
False
Device management principles are changing rapidly to accommodate cloud computing.
False
A router is an internetworking device, primarily software driven, which directs traffic between two different types of LANs or two network segments with different protocol addresses.
True
In the N-Step SCAN device-scheduling algorithm, any requests that arrive while the arm is in motion are grouped for the arm’s next sweep.
True
The objective of a hybrid configuration is to select among the strong points of each topology and combine them to meet that system’s communications requirements most effectively.
True
The job of the I/O control unit is to keep up with the I/O requests from the CPU and pass them down the line to the appropriate control unit.
False
There are many more sectors on an optical disc than on a magnetic disk of the same area.
True
Blu-ray discs are available in several formats: read-only (BD-ROM), recordable (BD-R), and rewritable (BD-RE).
True
When using the distributed-queue, dual bus (DQDB) protocol, transmission on each bus consists of a steady stream of fixed-size slots.
True
Sequential record organization is by far the easiest to implement because records are stored and retrieved serially, one after the other.
True
Seek time is the most important characteristic of a fixed-head disk drive.
False
RAID Level 0 is not considered a true form of RAID because it cannot recover from hardware failure.
True
RAID is a set of logical disk drives, viewed as a single physical unit by the operating system.
True
An indexed sequential file does not have overflow areas.
False
Nested RAID levels, also called hybrid levels, are complex RAID configurations created by combining multiple standard levels.
True
When using DMA, the CPU controls the transfer of data to and from memory over the system bus.
True
Two of the most important measures of optical disc drive performance are sustained data-transfer rate and maximum access time.
False
RAID begins with the assumption that a small set of large-capacity disk drives is preferable to a larger set of small-capacity disk drives.
False
A volume must contain a single file.
False
A seek strategy for an I/O device handler is the predetermined policy that the device handler uses to allocate access to the device among the many processes that may be waiting for it. It determines the order in which the processes get the device; the goal is to keep transfer time to a minimum.
True
Direct access storage devices (DASDs) are devices that can directly read or write to an arbitrary place on a disk.
True
The Transmission Control Protocol/Internet Protocol (TCP/IP) reference model is the basis for Internet communications and is the most widely used network layer protocol today.
True
A compressed image file can be reconstructed if a lossy compression algorithm is used because the compression process is reversible.
False
An optical disc drive spins at a constant speed—this is called constant linear velocity.
True
The Shortest Seek Time First device-scheduling algorithm moves the arm methodically from the inner to the outer track, servicing every request in its path.
False
A DVD with a fast data transfer rate will drop fewer frames when playing back a recorded video segment than will a unit with a slower transfer rate.
True

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