WGU D686 exam QUESTIONS
AND VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
A thread represents a - CORRECT ANSWER-fundamental unit of CPU utilization within a process,
A thread has essential components such as - CORRECT ANSWER-a thread ID, program counter,
register set, and stack.
Threads within the same process share - CORRECT ANSWER-code, data, and operating system
resources like files and signals.
If a process has multiple threads, it can do - CORRECT ANSWER-multiple tasks at once. This has
several benefits: it keeps applications responsive, allows easy resource sharing, saves memory
and time, and takes advantage of multiple processors to run tasks faster
In multithreading models, the diverse approaches to managing threads within OS distinguish
between - CORRECT ANSWER-user-level threads (threads that operate exclusively in user mode)
and kernel-level threads (threads that operate in kernel mode)
There are three primary threading models: - CORRECT ANSWER-the many-to-one
one-to-one
many-to-many
,Each threading model influences - CORRECT ANSWER-concurrency and system performance
differently
an operating system is a - CORRECT ANSWER-resource allocator
A control program manages the - CORRECT ANSWER-execution of user programs to prevent
errors and improper use of the computer, especially with the operation and control of I/O
devices
CPU hardware has a wire called the _____________ that the CPU senses after executing every
instruction - CORRECT ANSWER-interrupt-request line
When the CPU detects that a controller has asserted a signal on the interrupt-request line, it
reads the interrupt number and jumps to the _________________ by using that interrupt
number as an index into the interrupt vector - CORRECT ANSWER-interrupt-handler routine
Most CPUs have two - CORRECT ANSWER-interrupt request lines
The ____________ interrupt, is reserved for events such as unrecoverable memory errors -
CORRECT ANSWER-nonmaskable
The second interrupt line is _________, it can be turned off by the CPU before the execution of
critical instruction sequences that must not be interrupted - CORRECT ANSWER-maskable
The maskable interrupt is used by device controllers to request service
the purpose of a _______________________ is to reduce the need for a single interrupt
handler to search all possible sources of interrupts to determine which one needs service -
CORRECT ANSWER-vectored interrupt mechanism
, A mechanism by which each element in an interrupt vector points to the head of a list of
interrupt handlers, which are called individually until one is found to service the interrupt
request - CORRECT ANSWER-interrupt chaining
A typical instruction-execution cycle, as executed on a system with a von Neumann architecture,
first fetches - CORRECT ANSWER-an instruction from memory and stores that instruction in the
instruction register.
storage that is slow enough and large enough that it is used only for special purposes is called -
CORRECT ANSWER-tertiary storage
User mode refers to the CPU operating mode that - CORRECT ANSWER-restricts certain
instructions from executing user processes
kernel mode refers to a CPU operating mode where - CORRECT ANSWER-all instructions are
accessible
At system boot time, the hardware starts in - CORRECT ANSWER-kernel mode
The operating system is loaded after kernel mode and then starts - CORRECT ANSWER-user
applications in user mode
Whenever a trap or interrupt occurs, the hardware switches from - CORRECT ANSWER-user
mode to kernel mode (that is, changes the state of the mode bit to 0)
whenever the operating system gains control of the computer, it is in - CORRECT ANSWER-
kernel mode
AND VERIFIED CORRECT
ANSWERS GRADED A+
LATEST 100% GUARANTEED
PASS
A thread represents a - CORRECT ANSWER-fundamental unit of CPU utilization within a process,
A thread has essential components such as - CORRECT ANSWER-a thread ID, program counter,
register set, and stack.
Threads within the same process share - CORRECT ANSWER-code, data, and operating system
resources like files and signals.
If a process has multiple threads, it can do - CORRECT ANSWER-multiple tasks at once. This has
several benefits: it keeps applications responsive, allows easy resource sharing, saves memory
and time, and takes advantage of multiple processors to run tasks faster
In multithreading models, the diverse approaches to managing threads within OS distinguish
between - CORRECT ANSWER-user-level threads (threads that operate exclusively in user mode)
and kernel-level threads (threads that operate in kernel mode)
There are three primary threading models: - CORRECT ANSWER-the many-to-one
one-to-one
many-to-many
,Each threading model influences - CORRECT ANSWER-concurrency and system performance
differently
an operating system is a - CORRECT ANSWER-resource allocator
A control program manages the - CORRECT ANSWER-execution of user programs to prevent
errors and improper use of the computer, especially with the operation and control of I/O
devices
CPU hardware has a wire called the _____________ that the CPU senses after executing every
instruction - CORRECT ANSWER-interrupt-request line
When the CPU detects that a controller has asserted a signal on the interrupt-request line, it
reads the interrupt number and jumps to the _________________ by using that interrupt
number as an index into the interrupt vector - CORRECT ANSWER-interrupt-handler routine
Most CPUs have two - CORRECT ANSWER-interrupt request lines
The ____________ interrupt, is reserved for events such as unrecoverable memory errors -
CORRECT ANSWER-nonmaskable
The second interrupt line is _________, it can be turned off by the CPU before the execution of
critical instruction sequences that must not be interrupted - CORRECT ANSWER-maskable
The maskable interrupt is used by device controllers to request service
the purpose of a _______________________ is to reduce the need for a single interrupt
handler to search all possible sources of interrupts to determine which one needs service -
CORRECT ANSWER-vectored interrupt mechanism
, A mechanism by which each element in an interrupt vector points to the head of a list of
interrupt handlers, which are called individually until one is found to service the interrupt
request - CORRECT ANSWER-interrupt chaining
A typical instruction-execution cycle, as executed on a system with a von Neumann architecture,
first fetches - CORRECT ANSWER-an instruction from memory and stores that instruction in the
instruction register.
storage that is slow enough and large enough that it is used only for special purposes is called -
CORRECT ANSWER-tertiary storage
User mode refers to the CPU operating mode that - CORRECT ANSWER-restricts certain
instructions from executing user processes
kernel mode refers to a CPU operating mode where - CORRECT ANSWER-all instructions are
accessible
At system boot time, the hardware starts in - CORRECT ANSWER-kernel mode
The operating system is loaded after kernel mode and then starts - CORRECT ANSWER-user
applications in user mode
Whenever a trap or interrupt occurs, the hardware switches from - CORRECT ANSWER-user
mode to kernel mode (that is, changes the state of the mode bit to 0)
whenever the operating system gains control of the computer, it is in - CORRECT ANSWER-
kernel mode
