WGU C191 Module 3: Memory Management Preliminary Test Exam Questions along with Certified Answers Latest updates 2024/2025
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WGU C191
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WGU C191
WGU C191 Module 3: Memory Management Preliminary Test Exam Questions along with Certified Answers Latest updates 2024/2025
Consider a logical address with a page size of 8 KB. How many bits must be used to represent the page offset in the logical address? - correct answer 13
________ allows t...
WGU C191 Module 3: Memory
Management Preliminary Test Exam
Questions along with Certified Answers
Latest updates 2024/2025
Consider a logical address with a page size of 8 KB. How many bits must be used to
represent the page offset in the logical address? - correct answer 13
________ allows the parent and child processes to initially share the same pages, but
when either process modifies a page, a copy of the shared page is created. - correct
answer Copy-on-write
Consider a logical address with 18 bits used to represent an entry in a conventional
page table. How many entries are in the conventional page table? - correct answer
262144
_____ is the algorithm implemented on most systems. - correct answer LRU
_____ occurs when a process spends more time paging than executing. - correct
answer Thrashing
Which of the following statements is false with regard to Solaris memory management?
- correct answer The speed at which pages are examined (the scan rate) is constant.
Consider a 32-bit address for a two-level paging system with an 8 KB page size. The
outer page table has 1024 entries. How many bits are used to represent the second-
level page table? - correct answer 9
Which of the following statements is false with regard to allocating kernel memory? -
correct answer Because the kernel requests memory of varying sizes, some of which
may be quite small, the system does not have to be concerned about wasting memory.
,A(n) ______ matches the process with each entry in the TLB. - correct answer address
space identifier
Systems in which memory access times vary significantly are known as __________. -
correct answer non-uniform memory access
Which of the following statements is true with respect to hashed page tables? - correct
answer They are a common approach for handling address spaces larger than 32 bits.
Which of the following is considered a benefit when using the slab allocator? - correct
answer There is no memory fragmentation.
Which of the following is not a reason explaining why mobile devices generally do not
support swapping? - correct answer small size of mobile applications do not require
use of swap space
What is the role of the OS? - correct answer To manage a computer's hardware
Which OS service provides functions that are helpful to the user? - correct answer
Program execution
Which system call is used for device manipulation? - correct answer ReadConsole()
Which system calls can be grouped under the category of process controls? - correct
answer Allocate, free memory
Which service function is responsible for identifying and correcting exceptions such as
the lack of paper in a printer? - correct answer Error detection
Which type of OS service uses the CLI? - correct answer User interface
,What represents layer zero (0) in the layered approach? - correct answer Hardware
What is a disadvantage of booting an OS stored in ROM? - correct answer Changing a
bootstrap requires new hardware chips.
What is a valid process state? - correct answer Waiting
What are two valid components of a process control block (PCB)?Choose 2 answers. -
correct answer The process state
The process counter
What is the difference between kernel and user threads? - correct answer Kernel
threads are directly managed by the operating system, whereas user threads are
managed without kernel support.
Which advantage does short-term scheduling have compared with long-term
scheduling? - correct answer It takes less time to select a process to execute next.
What is considered stable when the average rate of process creation is equal to the
average departure rate of processes leaving the system? - correct answer The degree
of multiprogramming
Which action allows an application that is in the background to be passed to the
foreground and vice versa? - correct answer Context switching
What is the process of context switching? - correct answer Performing a state save
and a state restore
Which features are included in the DTrace tool? - correct answer Compiler, providers
of probes, and consumers
, What is the difference between cooperative and preemptive scheduling? - correct
answer Cooperative scheduling occurs when a process terminates, whereas
preemptive scheduling occurs when a process initiates.
Which scheduling criteria measures the number of processes completed per time unit? -
correct answer Throughput
Which criterion attempts to keep the processor as busy as possible? - correct answer
CPU utilization
When does starvation occur in the priority scheduling algorithm? - correct answer
When a process is waiting indefinitely
Which scheduling algorithm was designed especially for time sharing systems? -
correct answer Round-robin
What is a difference between soft and hard processor affinity? - correct answer Hard
affinity specifies a subset of processors on which a process may run, whereas soft
affinity leaves the processor selection to the OS.
What is an address that is generated by the CPU? - correct answer A logical address
Which general-purpose storage is accessed directly by the CPU? - correct answer The
main memory
What is a limitation of swapping on mobile systems? - correct answer Applications that
fail to free up sufficient memory are terminated.
What is the name of the memory allocation scheme where the operating system keeps
a table of available holes? - correct answer Variable partition
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