Operating System (OS)
The most common security failure is

too much emphasis on preventing physical access
depending on passwords
None of these
carelessness by users
insufficient technology used to prevent breaches

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

None of these
contains the address of the memory location that is to be read from or stored into.
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".
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
Swapping

allows each program in turn to use the memory
None of these
does not work with overlaying
works best with many small partitions
allows many programs to use memory simultaneously

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