Page 1 of 60
WGU D686 - OA AND PRE-ASSESSMENT
PREP
EXAM| D686 OPERATING SYSTEMS FOR
COMPUTER
SCIENTISTS NEWEST EXAM
QUESTIONS AND CORRECT
VERIFIED ANSWERS
Which term describes a number indicating the position of a block
of data in a file, starting from 0 for the initial block? - ✔✔✔ Correct Answer >
Block offset
How does shared memory facilitate efficient communication between
multiple processes by enabling direct data exchange without copying? -
✔✔✔ Correct Answer > By enabling real-time data synchronization and
parallel processing
,Page 2 of 60
Which register stores data to be sent to the device in an I/O operation? -
✔✔✔ Correct Answer > Data-out register
What is a common computer I/O bus connecting the CPU to I/O devices?
- ✔✔✔ Correct Answer > Peripheral Component Interconnect Express (PCIe)
bus
Which method involves transferring data between a central processing
unit (CPU) and a peripheral device a few bytes at a time? - ✔✔✔ Correct
Answer > Programmed I/O (PIO)
How do modern hard disk drives (HDDs) map logical block addresses
(LBAs) to physical addresses? - ✔✔✔ Correct Answer > Under drive control,
without exposing the details to the host
What is the purpose of dynamic random access memory (DRAM)
buffers in the drive controller of a hard disk drive (HDD)? - ✔✔✔ Correct
Answer > To improve the disk's performance
How do file systems contribute to efficient storage management?
,Page 3 of 60
- ✔✔✔ Correct Answer > By managing storage space allocation effectively
How are files typically managed on hard disks in operating systems
using the contiguous allocation method? - ✔✔✔ Correct
Answer > Files are stored in adjacent blocks for sequential access.
What is the maximum number of files and directories that can be stored
in a single directory in the New Technology File System
(NTFS)? - ✔✔✔ Correct Answer > Unlimited
What is the maximum file size supported by the Fourth Extended File
System (EXT4) in Linux? - ✔✔✔ Correct Answer > 16 TB
Which allocation technique involves storing files in consecutive blocks
on a storage device? - ✔✔✔ Correct Answer > Contiguous allocation
What is the primary objective of implementing access control
mechanisms in a computer system? - ✔✔✔ Correct Answer > Regulating user
access to system resources and enforcing permissions
, Page 4 of 60
What is always true about the access matrix? - ✔✔✔ Correct Answer > It
provides varying levels of access control.
What is one goal of protection against security threats to operating
systems? - ✔✔✔ Correct Answer > Ensuring confidentiality of data
What ensures system integrity and data preservation in computer
systems? - ✔✔✔ Correct Answer > Ensuring security
How does a breach of confidentiality differ from a breach of integrity? -
✔✔✔ Correct Answer > A breach of confidentiality involves unauthorized
reading of data, while a breach of integrity involves modifying data.
Which method allows an attacker to intercept and alter communication
between two parties? - ✔✔✔ Correct Answer > Man-inthe-middle attack
What is a disadvantage of contiguous allocation for file storage? -
✔✔✔ Correct Answer > External fragmentation
WGU D686 - OA AND PRE-ASSESSMENT
PREP
EXAM| D686 OPERATING SYSTEMS FOR
COMPUTER
SCIENTISTS NEWEST EXAM
QUESTIONS AND CORRECT
VERIFIED ANSWERS
Which term describes a number indicating the position of a block
of data in a file, starting from 0 for the initial block? - ✔✔✔ Correct Answer >
Block offset
How does shared memory facilitate efficient communication between
multiple processes by enabling direct data exchange without copying? -
✔✔✔ Correct Answer > By enabling real-time data synchronization and
parallel processing
,Page 2 of 60
Which register stores data to be sent to the device in an I/O operation? -
✔✔✔ Correct Answer > Data-out register
What is a common computer I/O bus connecting the CPU to I/O devices?
- ✔✔✔ Correct Answer > Peripheral Component Interconnect Express (PCIe)
bus
Which method involves transferring data between a central processing
unit (CPU) and a peripheral device a few bytes at a time? - ✔✔✔ Correct
Answer > Programmed I/O (PIO)
How do modern hard disk drives (HDDs) map logical block addresses
(LBAs) to physical addresses? - ✔✔✔ Correct Answer > Under drive control,
without exposing the details to the host
What is the purpose of dynamic random access memory (DRAM)
buffers in the drive controller of a hard disk drive (HDD)? - ✔✔✔ Correct
Answer > To improve the disk's performance
How do file systems contribute to efficient storage management?
,Page 3 of 60
- ✔✔✔ Correct Answer > By managing storage space allocation effectively
How are files typically managed on hard disks in operating systems
using the contiguous allocation method? - ✔✔✔ Correct
Answer > Files are stored in adjacent blocks for sequential access.
What is the maximum number of files and directories that can be stored
in a single directory in the New Technology File System
(NTFS)? - ✔✔✔ Correct Answer > Unlimited
What is the maximum file size supported by the Fourth Extended File
System (EXT4) in Linux? - ✔✔✔ Correct Answer > 16 TB
Which allocation technique involves storing files in consecutive blocks
on a storage device? - ✔✔✔ Correct Answer > Contiguous allocation
What is the primary objective of implementing access control
mechanisms in a computer system? - ✔✔✔ Correct Answer > Regulating user
access to system resources and enforcing permissions
, Page 4 of 60
What is always true about the access matrix? - ✔✔✔ Correct Answer > It
provides varying levels of access control.
What is one goal of protection against security threats to operating
systems? - ✔✔✔ Correct Answer > Ensuring confidentiality of data
What ensures system integrity and data preservation in computer
systems? - ✔✔✔ Correct Answer > Ensuring security
How does a breach of confidentiality differ from a breach of integrity? -
✔✔✔ Correct Answer > A breach of confidentiality involves unauthorized
reading of data, while a breach of integrity involves modifying data.
Which method allows an attacker to intercept and alter communication
between two parties? - ✔✔✔ Correct Answer > Man-inthe-middle attack
What is a disadvantage of contiguous allocation for file storage? -
✔✔✔ Correct Answer > External fragmentation
