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D686 ACTUAL REVISION TEST, Exams of Advanced Education

Cheyney University of PennsylvaniaAdvanced Education

D686 ACTUAL REVISION TEST UPDATED VERSION

Typology: Exams

2025/2026

Available from 06/04/2026

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D686 ACTUAL REVISION TEST
1. What is the role of an operating system in modern computing?:
Managing
hardware resources and providing a user interface
2. How do operating systems enhance the efficiency of computer
systems?: By
managing and coordinating hardware and software resources
3. Which components are managed by an operating system?: CPU,
memory, and device
controllers
4. What is the role of the operating system in handling I/O operations?:
Managing
data flow between hardware components
5. What does dual mode operation in operating systems enable?:
Ditterentiation
between user mode and kernel mode operations
6. How does an operating system prevent a single program from
monopolizing
the
CPU?:
By using a timer to interrupt programs
7.
Which type of operating system is suited for handling multiple
programs
running simultaneously?: Multiprogramming
8.
Which type of operating system allows multiple users to share
resources
effectively?: Distributed
9. What is a significant limitation of operating systems in managing
computer
resources?:
Susceptibility to security vulnerabilities
10. How do operating systems protect data and maintain system
integrity?:
By
isolating processes and controlling access to resources
11. Which function does the file system service in an operating
system primar-
ily provide?: Managing data storage
12. How does the error detection service contribute to system
stability?:
By
constantly monitoring and correcting faults
13. How does a graphical user interface (GUI) benefit users
interacting with an
operating
system?:
By allowing users to interact with the system
using visual elements
14. Which aspect of system services enhances user experience
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D686 ACTUAL REVISION TEST

  1. What is the role of an operating system in modern computing?: Managing hardware resources and providing a user interface
  2. How do operating systems enhance the efficiency of computer systems?: By managing and coordinating hardware and software resources
  3. Which components are managed by an operating system?: CPU, memory, and device controllers
  4. What is the role of the operating system in handling I/O operations?: Managing data flow between hardware components
  5. What does dual mode operation in operating systems enable?: Ditterentiation between user mode and kernel mode operations
  6. How does an operating system prevent a single program from monopolizing the CPU?: By using a timer to interrupt programs
  7. Which type of operating system is suited for handling multiple programs running simultaneously?: Multiprogramming
  8. Which type of operating system allows multiple users to share resources effectively?: Distributed
  9. What is a significant limitation of operating systems in managing computer resources?: Susceptibility to security vulnerabilities
  10. How do operating systems protect data and maintain system integrity?: By isolating processes and controlling access to resources
  11. Which function does the file system service in an operating system primar- ily provide?: Managing data storage
  12. How does the error detection service contribute to system stability?: By constantly monitoring and correcting faults
  13. How does a graphical user interface (GUI) benefit users interacting with an operating system?: By allowing users to interact with the system using visual elements
  14. Which aspect of system services enhances user experience

2 / 30 in mobile de- vices?: Touch-screen interfaces

  1. Which role do system calls play in an operating system?: Acting as a bridge between applications and the kernel
  2. Which system call is used for file management?: ReadFile()
  3. Which characteristic defines a single-processor system?: Utilizing a single CPU core for executing instructions
  4. Which benefit do multiprocessor systems provide over single-processor systems?: Increased throughput and eflciency for tasks
  5. What is the purpose of system utilities in an operating system?: Facilitating program development and execution
  6. Which operating system structure separates functionality into multiple lay- ers?: Layered structure
  7. Which vulnerability can be exploited by malicious actors to gain unautho- rized access to operating systems?: Butter overflows
  8. What is the primary purpose of asymmetric clustering in a clustered sys- tem?: To ensure one computer is always in hot-standby mode
  9. Which system service enables the operating system to interact with periph- eral hardware, such as disk drives and printers?: Device management
  10. What is the role of a process in a computer system?: Executing user and system tasks
  11. Which state is a process when it is paused and is not currently being executed?: Waiting
  12. How does a context switch impact CPU performance?: It temporarily suspends the current process to switch to another.
  13. What is the purpose of scheduling queues in process management?: To manage the order of process execution
  14. What is the result of a fork() system call in Unix?: Creation of a child process
  15. Which mechanism allows processes to work together without interfering with each other?: Communication through interprocess mechanisms

4 / 30 : Monitor

  1. How does a monitor ensure that only one process can access shared data at a time?: By implementing condition variables
  2. What is the method used to determine which processes will be assigned to the CPU for execution?: CPU scheduling
  3. How does a preemptive scheduling algorithm differ from a non-preemptive scheduling algorithm?: Preemptive scheduling can interrupt a running process to assign the CPU to another process.
  4. Which criterion measures the total time taken from the submission of a process to its completion?: Turnaround time
  5. Which scheduling criterion aims to keep the CPU as busy as possible?: Uti- lization
  6. Which scheduling algorithm executes the process that arrives first?: First-come, first-served
  7. How does shortest job first scheduling determine the order of process execution?: By the length of the next CPU burst of each process
  8. Which scheduling algorithm allocates a fixed time slice to each process in the ready queue?: Round-robin
  9. How is real-time scheduling different from traditional scheduling algo- rithms?: Real-time scheduling ensures processes meet deadlines.
  10. Which type of scheduling uses multiple queues, each with its own schedul- ing algorithm?: Multilevel queue
  11. What is the purpose of load balancing in multiprocessor scheduling?: To ensure equal distribution of tasks across processors
  12. Maria is developing a software application where multiple threads request and hold resources while waiting for additional ones. How would this approach cause a deadlock situation?: Threads wait for resources while holding others, causing a circular wait.
  13. In a database management system at Alliah Company, cycles in a wait-for graph have been identified. What should the system administrator conclude?: There is a potential deadlock

5 / 30 in the system.

  1. A set of processes in a production server at Synesthor are unable to proceed because each process is holding a resource and waiting for another. Which condition must be present for this deadlock to occur?: Mutual exclusion
  2. The system administrator is analyzing a resource allocation graph (RAG) for a project at Merrilton Robotics. How can this graph help the system administrator understand potential dead- locks?: By illustrating resource requests and allocations
  3. Jack is tasked with implementing a strategy at Quiet Flag Industries to prevent deadlocks in their manufacturing control system. Which strategy should Jack use to ensure a process does not retain resources while requesting another?: Hold and wait prevention

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  1. A cloud service provider allocates resources to multiple virtual machines. However, if all virtual machines simultaneously request their maximum de- clared resources, the system may not be able to avoid deadlock. Which term describes the system's state in this scenario?: Unsafe state

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  1. During a high-demand period, an operating system is struggling to ef- ficiently allocate CPU time, memory, and storage among multiple running processes, leading to performance bottlenecks. Which strategy might im- prove the operating system's efficiency in this scenario?: Dynamic allocation
  2. What defines a logical address space using base and limit registers?: Base and limit registers
  3. How do base and limit registers contribute to hardware address protec- tion?: By defining the range of accessible addresses
  4. Which process binds logical addresses to physical addresses?: Address binding
  5. Which characteristic differentiates a logical address space from a physical address space?: Logical address space is used by the CPU, while physical address space is used by memory.
  6. Which mechanism protects memory from being accessed incorrectly?: Mem- ory protection
  7. How is memory allocated and managed in a system?: By using fixed and variable partitions
  8. What ensures that each process has its own separate memory space?: Mem- ory protection
  9. Which issue is caused by fixed partition memory management?: Internal frag- mentation
  10. What causes external fragmentation in memory management?: Dynamic alloca- tion of memory blocks
  11. What is the 50% rule in memory management?: 50% of memory is lost to fragmentation.
  12. How does the translation look-aside buffer (TLB) enhance memory man- agement in an operating system?: By speeding up address translation
  13. What is the function of a page table in the context of paging?: To store frame addresses
  14. How does segmentation improve memory management?: By

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  1. What role does a segment table play in segmented paging?: Stores segment bases
  2. What is the purpose of swapping in memory management?: To move inactive processes
  3. How does swapping differ in mobile systems compared to traditional sys- tems?: Often not supported due to constraints
  4. What is a backing store in the context of swapping?: Storage for swapped-out processes
  5. How does swapping help in managing memory in a multitasking environ- ment?: Handling more processes than physical memory
  6. What is an advantage of using virtual memory in an operating system?: Allows programs to use more memory
  7. How does demand paging optimize memory usage?: Loads only the necessary parts of a program
  8. What happens when a process tries to access a page that is not currently in memory?: A page fault occurs.
  9. What is pure demand paging?: Loading pages only when needed
  10. Which mechanism is used to handle page faults efficiently in demand paging?: Valid-invalid bit
  11. What is the purpose of page replacement in memory management?: Replace less frequently used pages
  12. Which algorithm replaces the page not used for the longest time?: Least recently used
  13. What is a disadvantage of the optimal page replacement algorithm?: It requires future knowledge of reference strings.
  14. How does the translation look-aside buffer (TLB) enhance memory man- agement?: By speeding up address translation
  15. What is thrashing in memory management?: When the CPU spends excessive time swapping pages
  16. What is the term for the wasted memory between allocated partitions in fixed partitioning memory management?: External fragmentation

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  1. Which strategy involves allocating memory by selecting the earliest avail- able block that is large enough to fit a process?: First- fit

13 / 30

  1. How does direct memory access (DMA) improve system performance?: Data transfer without CPU involvement
  2. What is the purpose of interrupts in an I/O system?: Signaling the CPU for I/O attention

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  1. How does polling differ from interrupts in handling I/O operations?: Polling involves continuously checking the status of devices.
  2. What is the function of the PCIe bus in a typical PC bus structure?: Connecting the processor to fast I/O devices
  3. What does the STREAMS framework in UNIX systems enable?: Dynamic creation of pipelines
  4. What is the role of the stream head in the STREAMS architecture?: Connection of user processes
  5. How does the STREAMS framework handle asynchronous I/O?: Dynamic loading of modules
  6. What is the first step in the life cycle of a blocking read request?: Process issues a read() system call
  7. What distinguishes volatile memory from nonvolatile memory?: Nonvolatile memory retains data without power
  8. How do NAND semiconductors enhance storage systems?: By providing higher storage density
  9. Which disk scheduling algorithm aims to minimize the seek time by choos- ing the request closest to the current head position?: Shortest seek time first (SSTF)
  10. What is an advantage of the SCAN disk scheduling algorithm?: Reduces the average seek time
  11. What is the purpose of error detection mechanisms in mass storage de- vices?: To ensure data integrity
  12. Which technique is used for error detection in storage devices?: Parity checking
  13. What is the purpose of drive formatting?: To prepare the drive for data storage
  14. What is the purpose of partitioning a drive?: Divide the drive into separate logical sections
  15. Which storage attachment method connects storage devices directly to a server or workstation?: Host-attached storage
  16. What is an advantage of using a storage area network

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  1. Which structure represents the hierarchical organization of files within a file system?: Directory structure
  2. What does a file-control block (FCB) store?: File attributes and metadata
  3. Which structure is involved in the process of opening a file in a file system?- : File-control block
  4. Which structure does the file system use to keep track of open files in memory?: In-memory file table
  5. What is the purpose of a free-space list in a file system?: To keep track of available disk space
  6. Which technique does linked allocation use to manage file storage?: Using pointers to connect file blocks
  7. What is a disadvantage of contiguous allocation for file storage?: External fragmentation
  8. Which allocation method manages file blocks using a linked list?: Linked allocation
  9. What is the purpose of an index in indexed allocation?: To store pointers to file blocks
  10. Which process involves attaching a file system to a directory in an operat- ing system?: Mounting a file system
  11. Which step is involved in the file-system mounting process?: Checking for a valid file system
  12. What is the difference between a "raw" and a "cooked" partition?: Raw partitions contain no file system, while cooked partitions do.
  13. What does a bootloader need to know before booting an operating sys- tem?: The file system type of the root partition
  14. Which feature does the NTFS file system provide?: Support for journaling
  15. Which file system was the first to introduce journaling in Linux?: EXT
  16. Which advantage does the EXT4 file system have over EXT3?: Improved perfor- mance

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  1. Which characteristic is shared by both NTFS and EXT4 file systems?: Both provide journaling.
  2. What does the master file table (MFT) in NTFS resemble in Unix- derived file systems?: Inodes

19 / 30 Extended File System (EXT4) in Linux?: 16 TB

  1. Which allocation technique involves storing files in consecutive blocks on a storage device?: Contiguous allocation
  2. What is the primary objective of implementing access control mechanisms in a computer system?: Regulating user access to system resources and enforcing permissions
  3. What is always true about the access matrix?: It provides varying levels of access control.
  4. What is one goal of protection against security threats to operating sys- tems?: Ensuring confidentiality of data

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  1. What ensures system integrity and data preservation in computer sys- tems?: Ensuring security
  2. How does a breach of confidentiality differ from a breach of integrity?: A breach of confidentiality involves unauthorized reading of data, while a breach of integrity involves modifying data.
  3. Which method allows an attacker to intercept and alter communication between two parties?: Man-in-the-middle attack
  4. How does the four-layered security model protect systems?: By securing each layer
  5. What disguises itself as legitimate software to perform harmful actions?- : Trojan horse
  6. How does a logic bomb operate within a system?: It activates under specific conditions.
  7. Which type of network attack involves taking control of an active commu- nication session?: Session hijacking
  8. What is the goal of a denial-of-service attack?: Disrupting system use
  9. Which technique ensures data has not been altered during transmission?- : Digital signatures
  10. What converts data into a code to prevent unauthorized access?: Encryption
  11. What is a goal of protection mechanisms in operating systems?: To prevent unauthorized access
  12. How does the principle of least privilege contribute to system security?: By giving users only the access they need
  13. Which protection ring has the highest level of privilege in a modern oper- ating system?: Ring 0
  14. What defines the set of resources a process can access in a protection domain?: Access rights
  15. How does the principle of defense in depth enhance system security?: By implementing multiple layers of security