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COMM 191 EXAM PREP TEST BANK VERIFIED QUESTIONS AND CORRECT ANSWERS

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COMM 191 EXAM PREP TEST BANK VERIFIED QUESTIONS AND CORRECT ANSWERS

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COMM 191 EXAM PREP TEST BANK
VERIFIED QUESTIONS AND CORRECT
ANSWERS

●● CPU
Answer: processor that performs the computations


●● I/O devices
Answer: terminal,disks,video board, printer, network card key
component but also considered one as well.


●● Main Memory
Answer: contains data and programs used by the CPU


●● System bus
Answer: communication medium between CPU, memory and
peripherals


●● Kernel Mode
Answer: When the OS has control of the computer rather than the user, it
is in what mode?

, ●● Privileged instructions
Answer: These instructions are restricted to use only by the OS and
make it so that the user may not access , memory, halt the machine,
disable and enable interrupts, or address I/O directly


●● System Call
Answer: Provides interface to services made available by OS. Causes
traps to allow the kernel to execute privileged instructions


●● traps
Answer: What do system calls cause?


●● API stands for?
Answer: application programming interface


●● API - Application programming interface definition.
Answer: Specifies a set of functions that are available to an application
programmer, including the parameters that are passed to each function
and the return values the programmer can expect


●● Trap or Exception
Answer: Software generated interrupt. It causes the kernel to take over
and initiate a process.

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