WGU D686
WGU D686 OA | Objective Assessment | Questions and
Answers | 2026 Update | 100% Correct.
Testbankscove
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,Page 1
1. How does demand paging optimize memory usage?
A) Loads only the necessary parts of a program
B) Allocates memory randomly
C) Prevents the use of secondary storage
,D) Loads the entire program into memory
Correct answer: A
Rationale: Demand paging loads pages into memory only when they are accessed,
reducing memory usage.
2. What is the first step in the life cycle of a blocking read request?
A) Kernel moves the process to the ready queue
B) CPU handles the interrupt
C) Process issues a read() system call
D) Device driver processes the request
Correct answer: C
Rationale: The process initiates the I/O operation by calling read().
3. What does a file-control block (FCB) store?
A) File attributes and metadata
B) Physical disk layout
C) Directory structure
D) Device driver information
Correct answer: A
Rationale: FCB stores metadata like permissions, size, timestamps.
Page 2
4. What is the term for wasted memory between allocated partitions in fixed
partitioning?
A) External fragmentation
B) Process allocation in partitions
C) Compaction
D) Internal fragmentation
Correct answer: D
Rationale: Fixed partitioning wastes space inside a partition if the process is smaller —
that's internal fragmentation.
5. Which method allows adding new rights and removing some rights in an access
matrix?
, A) Owner
B) Copy
C) Transfer
D) Limited Copy
Correct answer: C
Rationale: Transfer right allows a process to delegate or revoke access rights.
6. What is coordination of processes to ensure they don't interfere?
A) Synchronization
B) File system allocation
C) Memory management
D) I/O scheduling
Correct answer: A
Rationale: Synchronization coordinates concurrent processes to avoid race conditions.
Page 3
7. Foundational tools for secure communication and verifying identity?
A) Encryption and authentication
B) Compression and decryption
C) Backup and recovery
D) Firewall and antivirus
Correct answer: A
Rationale: Encryption secures data; authentication verifies identity.
8. How is free space managed using linked list method?
A) Organizing free blocks in a grid
B) Connecting free blocks in a chain
C) Storing free blocks randomly
D) Allocating based on file size
Correct answer: B
Rationale: Each free block points to the next free block.
9. Which directory structure allows users to create subdirectories?
A) Two-level
WGU D686 OA | Objective Assessment | Questions and
Answers | 2026 Update | 100% Correct.
Testbankscove
➢
➢
➢
➢
➢
,Page 1
1. How does demand paging optimize memory usage?
A) Loads only the necessary parts of a program
B) Allocates memory randomly
C) Prevents the use of secondary storage
,D) Loads the entire program into memory
Correct answer: A
Rationale: Demand paging loads pages into memory only when they are accessed,
reducing memory usage.
2. What is the first step in the life cycle of a blocking read request?
A) Kernel moves the process to the ready queue
B) CPU handles the interrupt
C) Process issues a read() system call
D) Device driver processes the request
Correct answer: C
Rationale: The process initiates the I/O operation by calling read().
3. What does a file-control block (FCB) store?
A) File attributes and metadata
B) Physical disk layout
C) Directory structure
D) Device driver information
Correct answer: A
Rationale: FCB stores metadata like permissions, size, timestamps.
Page 2
4. What is the term for wasted memory between allocated partitions in fixed
partitioning?
A) External fragmentation
B) Process allocation in partitions
C) Compaction
D) Internal fragmentation
Correct answer: D
Rationale: Fixed partitioning wastes space inside a partition if the process is smaller —
that's internal fragmentation.
5. Which method allows adding new rights and removing some rights in an access
matrix?
, A) Owner
B) Copy
C) Transfer
D) Limited Copy
Correct answer: C
Rationale: Transfer right allows a process to delegate or revoke access rights.
6. What is coordination of processes to ensure they don't interfere?
A) Synchronization
B) File system allocation
C) Memory management
D) I/O scheduling
Correct answer: A
Rationale: Synchronization coordinates concurrent processes to avoid race conditions.
Page 3
7. Foundational tools for secure communication and verifying identity?
A) Encryption and authentication
B) Compression and decryption
C) Backup and recovery
D) Firewall and antivirus
Correct answer: A
Rationale: Encryption secures data; authentication verifies identity.
8. How is free space managed using linked list method?
A) Organizing free blocks in a grid
B) Connecting free blocks in a chain
C) Storing free blocks randomly
D) Allocating based on file size
Correct answer: B
Rationale: Each free block points to the next free block.
9. Which directory structure allows users to create subdirectories?
A) Two-level
