Operating System (OS)
Process is

None of these
a job in secondary memory
program in High level language kept on disk
contents of main memory
a program in execution

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Operating System (OS)
Backups should be done

daily for most installations
as several incrementals, followed by an image copy
as several image copies, followed by an incremental
weekly for most installations
None of these

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Operating System (OS)
Trojan-Horse programs

usually are immediately discovered
are legitimate programs that allow unauthorized access
None of these
do not usually work
are hidden programs that do not show up on the system

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Operating System (OS)
The Memory Buffer Register (MBR)

is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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