Operating System (OS)
First-in-First-Out (FIFO) scheduling is

Fair Share Scheduling
Preemptive Scheduling
Deadline Scheduling
Non Preemptive Scheduling

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Operating System (OS)
System maintenance:

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

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Operating System (OS)
Data encryption

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

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