Operating System (OS)
Data encryption

is mostly used by financial networks
is mostly used by public networks
cannot be used by private installations
None of these
is not necessary, since data cannot be intercepted

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Operating System (OS)
System maintenance:

is not required if the system is well written
is usually not necessary
is necessary on all systems, regardless of how good
None of these
always requires several programs

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Operating System (OS)
The dispatcher

None of these
puts tasks in I/O wait
is always small and simple
actually schedules the tasks into the processor
never changes task priorities

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Operating System (OS)
Which of the following is not a characteristic of a daisy chaining priority control scheme?

it is relatively easy to add more devices to the chain
the number of control lines is independent of the number of devices on the chain
the failure of one device may affect other devices on the chain
priority is programmable
None of these

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