WGU D686 Assessment Test questions with 100% correct answers + rationales(PASSED)
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60 Terms
Which limitation can make it challenging for users to tailor the operating system to their exact requirements?
Inflexibility in customization
3 multiple choice options
How can the complexity of modern operating systems impact user experience?
By causing user errors and misconfigurations
3 multiple choice options
Which capability does an operating system have in terms of multitasking?
To enable the perception of simultaneous program execution by managing system resources
3 multiple choice options
How does the command interpreter in UNIX systems execute the command to delete a file?
It loads rm into memory and executes it with the file as a parameter.
3 multiple choice options
What does it mean for a kernel to be loosely coupled?
The kernel components are separate and independent.
3 multiple choice options
How does the operating system handle process synchronization to ensure data integrity among concurrent processes?
Through locking mechanisms like acquire_lock() and release_lock()
3 multiple choice options
Which components are included in the execution state of a process?
Register contents, program counter, stack, and heap
3 multiple choice options
What is the purpose of the Thread Control Block (TCB) in operating systems?
Managing execution and context switching
3 multiple choice options
How do multicore systems enhance performance compared to single-core systems?
By executing individual threads assigned to separate cores
3 multiple choice options
What does the dining philosophers problem illustrate?
The challenges of resource allocation
3 multiple choice options
Which role do monitors play in addressing the critical-section problem in process synchronization?
Ensuring orderly access to shared resources
3 multiple choice options
How do race conditions occur in the context of process synchronization?
When processes rely on timing and execution order
3 multiple choice options
What is a non-preemptive scheduling method?
A method where a thread retains a core until it terminates or enters the waiting state
3 multiple choice options
What is the effect of a very large time quantum in round-robin scheduling?
It behaves like first-come, first-served (FCFS) scheduling.
3 multiple choice options
In round-robin scheduling, how is the ready queue treated?
As a circular queue
3 multiple choice options
A system administrator is examining a resource-allocation graph to understand how processes and resources interact in a multi-tasking environment. The graph includes various points that represent the system's components.
How can the information represented by the nodes in this resource-allocation graph help the system administrator manage resources and detect potential deadlocks?
They show dependencies between processes and resources, helping to identify and prevent potential deadlocks.
3 multiple choice options
The system administrator notices that during peak usage, some processes consume more memory and storage than others, leading to performance issues across the system. To address the problem, the administrator needs to investigate which component of the operating system is managing the distribution of these system capabilities.
Which component should the administrator examine to correct the imbalance in system performance?
Resource manager
1 multiple choice option
After detecting a deadlock in a production system, the system administrator decides to forcibly release resources held by certain processes to resolve the issue.
What is the system administrator performing in this scenario?
Deadlock recovery
3 multiple choice options
Which process rearranges memory to reduce fragmentation by shifting allocated memory blocks to create larger contiguous free memory?
Compaction
3 multiple choice options
Which term refers to the problem of having large blocks of free memory but being unable to allocate them to processes due to size constraints?
External fragmentation
3 multiple choice options
What is the term for the memory allocation technique where memory is divided into differently sizes parts to accommodate processes?
Variable-partition
3 multiple choice options
Which strategy involves allocating memory by selecting the smallest available block that is large enough to fit a process?
Best-fit
3 multiple choice options
What happens to the memory it occupied when a process terminates?
It is added to the set of holes for future use.
3 multiple choice options
How does the memory management unit (MMU) use the relocation register to map logical addresses to physical addresses?
By adding the value in the relocation register to the logical address
3 multiple choice options
What is the memory management unit's (MMU) function in contiguous memory allocation?
To map logical addresses to physical addresses dynamically
3 multiple choice options
What is the purpose of dividing main memory into partitions for the operating system and user processes?
To allocate memory in the most efficient way possible
3 multiple choice options
What is Belady's anomaly in the context of memory management?
It is a phenomenon where increasing the available number of page frames in memory may result in an increase in the number of page faults, potentially degrading system performance.
3 multiple choice options
How does demand paging enhance computer performance in memory management systems?
By loading only the immediate program parts into memory, optimizing system efficiency and multitasking capabilities
3 multiple choice options
What is the purpose of accurately allocating memory frames based on the working set model of process execution?
To reduce the likelihood of frequent page faults and subsequent thrashing
3 multiple choice options
What does a victim frame represent in virtual memory management?
A memory frame chosen by the page-replacement algorithm to be replaced in virtual memory, potentially improving memory usage
3 multiple choice options
How are files organized in a computer system using structures that translate file names into control blocks for efficient file management?
File directories
3 multiple choice options
How are directories structured to facilitate file organization and accessibility, ranging from basic setups to intricate arrangements with nested folders?
Folder hierarchy
3 multiple choice options
What is the primary concern when handling data in computer systems, focusing on ensuring the data is dependable and secure?
Integrity
3 multiple choice options
What does the command less do in Linux?
Views the command output one screen at a time
3 multiple choice options
What is the function of the top command in Linux?
Shows active processes and system resource usage
3 multiple choice options
Why is dynamic loading of device drivers beneficial for an operating system?
It improves the system's ability to detect and manage hardware changes without rebooting.
3 multiple choice options
Which component manages I/O devices?
Controller
3 multiple choice options
What is an interrupt in the context of I/O operations?
A hardware mechanism to notify the central processing unit (CPU) of device attention
3 multiple choice options
What is a major disadvantage of using programmed I/O (PIO) instead of direct memory access (DMA)?
PIO requires the central processing unit (CPU) to be involved in each data transfer.
3 multiple choice options
What is the purpose of the interrupt-request line in a computer system?
To signal interrupts to the central processing unit (CPU)
3 multiple choice options
What are the two major components of access time for hard disk drives (HDDs)?
Seek time and rotational latency
3 multiple choice options
What is a common reason for using application programming interfaces [APIs] to access cloud storage instead of existing protocols like network file system [NFS] or common internet file system [CIFS]?
APIs are better suited to handle the latency and failure scenarios of a wide-area network (WAN).
3 multiple choice options
What does the term starvation refer to in the context of disk scheduling?
Certain requests waiting indefinitely or for a very long time
3 multiple choice options
Which type of storage is accessed through local input/output (I/O) ports?
Host-attached storage
3 multiple choice options
What does garbage collection do in the context of not AND (NAND) flash storage?
Reclaims space from invalid data
3 multiple choice options
What is one potential issue associated with using clusters of blocks in file systems to reduce space overhead?
Increased internal fragmentation due to underutilized clusters
3 multiple choice options
How is free space on a disk typically tracked using a bitmap method?
Each block is represented by a bit.
3 multiple choice options
How is free space on a disk typically managed using a linked list method?
By connecting free blocks in a chain
3 multiple choice options
What is the file allocation table [FAT] in the Microsoft Disk Operating System [MS-DOS]?
A table at the start of each volume that tracks disk blocks
3 multiple choice options
Which allocation technique creates the potential for fragmentation by storing data in non-contiguous blocks?
Linked allocation
3 multiple choice options
Which operating system uses /Volumes directory for mounting external devices?
MacOS
3 multiple choice options
Which layer in a layered file system architecture is responsible for managing disk I/O operations and interacting with the physical hardware?
Driver layer
3 multiple choice options
What is the purpose of specifying the mount point in the file system mounting process?
To define where in the hierarchy the mounted file system will be accessible
3 multiple choice options
Which operating system uses a drive letter system for file system mounting?
Microsoft Windows
3 multiple choice options
What is the challenge faced by networked computers in identifying the sender and recipient of network messages?
Lack of immediate, reliable identification
3 multiple choice options
What is the primary focus of protection in a computer system?
Enforcing policies and mechanisms to control access to system resources
3 multiple choice options
Why is it important to implement robust security measures in a computer system?
To reduce the risk of breaches and unauthorized interference
3 multiple choice options
How does discretionary access control (DAC) differ from advanced access control mechanisms like role-based access control (RBAC) or mandatory access control (MAC)?
Discretionary access control allows users to set permissions.
3 multiple choice options
How do protection rings contribute to security in operating systems?
By limiting access based on privilege levels
3 multiple choice options
How is an access matrix utilized in operating system security?
To control permissions
3 multiple choice options