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312. Addressing structure

defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
all of the above
✅ The correct answer is option A.

315. The most common security failure is

carelessness by users
depending on passwords
too much emphasis on preventing physical access
insufficient technology used to prevent breaches
✅ The correct answer is option A.

321. What is dispatch latency?

The time taken by the dispatcher to stop one process and start another
The time taken by the processor to write a file into disk
The whole time taken by all processor
None of Above
✅ The correct answer is option A.

284. User-Friendly Systems are:

required for object-oriented programming
easy to develop
common among traditional mainframe operating systems
becoming more common
✅ The correct answer is option D.

287. Memory management is :

not used in modern operating system
replaced with virtual memory on current systems
not used on multiprogramming systems
critical for even the simplest operating systems
✅ The correct answer is option D.

290. Data encryption

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
✅ The correct answer is option B.
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