WGU D686 OBJECTIVE
ASSESSMENT 2 NEWEST D686
OPERATING SYSTEMS FOR
COMPUTER SCIENTISTS OA FINAL
EXAM 300 QUESTIONS AND
CORRECT VERIFIED ANSWERS
GUARANTEED PASS (GRADED A+)
Domain 1: Operating System Fundamentals (Questions 1-12)
1. What is the primary role of an operating system?
A) To compile source code into machine language
B) To act as an intermediary between the user and computer hardware
C) To design user interfaces for applications
D) To manage network connections only
Answer: B — The OS serves as an intermediary between users/applications
and hardware, managing resources like CPU, memory, and I/O.
2. Which kernel type runs all OS services in a single address space?
A) Microkernel
B) Hybrid kernel
C) Monolithic kernel
D) Exokernel
, Answer: C — Monolithic kernels run all services in a single address space
for maximum performance but lack fault isolation.
3. A system crash in a driver causes the entire OS to fail. This is most
characteristic of which kernel type?
A) Microkernel
B) Monolithic kernel
C) Hybrid kernel
D) Nano kernel
Answer: B — In monolithic kernels, drivers run in kernel space; a bug in
one can crash the entire system.
4. What is the difference between user mode and kernel mode?
A) User mode is faster than kernel mode
B) Kernel mode allows unrestricted hardware access; user mode restricts it
C) User mode is only for system administrators
D) Kernel mode is used for running user applications
Answer: B — Dual-mode operation protects system integrity: kernel mode
has full hardware access, user mode is restricted.
5. A Type 1 hypervisor:
A) Runs on top of a host operating system
B) Runs directly on bare metal hardware
, C) Is also called a hosted hypervisor
D) Cannot support multiple guest OSes
Answer: B — Type 1 (bare-metal) hypervisors run directly on hardware
(e.g., VMware ESXi).
6. Which of the following is a Type 2 hypervisor?
A) VMware ESXi
B) Microsoft Hyper-V
C) Oracle VirtualBox
D) Citrix XenServer
Answer: C — VirtualBox runs as an application on a host OS, making it a
Type 2 hypervisor.
7. What hardware feature allows the CPU to switch between user mode
and kernel mode?
A) Memory Management Unit (MMU)
B) Mode bit
C) Program Counter
D) Arithmetic Logic Unit
Answer: B — The mode bit indicates current CPU privilege level (0 =
kernel, 1 = user).
8. Which OS function is NOT a core responsibility of the operating
system?
, A) Process management
B) Memory management
C) Compiling source code
D) File system management
Answer: C — Compiling is handled by compilers, not the OS itself (though
the OS provides execution context).
9. In a microkernel, most services run in:
A) Kernel space
B) User space
C) Hypervisor space
D) Firmware
Answer: B — Microkernels keep only core services in kernel space; drivers
and other services run in user space.
10. Which statement about hybrid kernels is true?
A) They are slower than monolithic kernels but more stable
B) They combine features of monolithic and microkernel designs
C) They are only used in embedded systems
D) They cannot support multiple CPUs
Answer: B — Hybrid kernels (e.g., Windows NT, macOS XNU) blend
monolithic performance with microkernel modularity.
ASSESSMENT 2 NEWEST D686
OPERATING SYSTEMS FOR
COMPUTER SCIENTISTS OA FINAL
EXAM 300 QUESTIONS AND
CORRECT VERIFIED ANSWERS
GUARANTEED PASS (GRADED A+)
Domain 1: Operating System Fundamentals (Questions 1-12)
1. What is the primary role of an operating system?
A) To compile source code into machine language
B) To act as an intermediary between the user and computer hardware
C) To design user interfaces for applications
D) To manage network connections only
Answer: B — The OS serves as an intermediary between users/applications
and hardware, managing resources like CPU, memory, and I/O.
2. Which kernel type runs all OS services in a single address space?
A) Microkernel
B) Hybrid kernel
C) Monolithic kernel
D) Exokernel
, Answer: C — Monolithic kernels run all services in a single address space
for maximum performance but lack fault isolation.
3. A system crash in a driver causes the entire OS to fail. This is most
characteristic of which kernel type?
A) Microkernel
B) Monolithic kernel
C) Hybrid kernel
D) Nano kernel
Answer: B — In monolithic kernels, drivers run in kernel space; a bug in
one can crash the entire system.
4. What is the difference between user mode and kernel mode?
A) User mode is faster than kernel mode
B) Kernel mode allows unrestricted hardware access; user mode restricts it
C) User mode is only for system administrators
D) Kernel mode is used for running user applications
Answer: B — Dual-mode operation protects system integrity: kernel mode
has full hardware access, user mode is restricted.
5. A Type 1 hypervisor:
A) Runs on top of a host operating system
B) Runs directly on bare metal hardware
, C) Is also called a hosted hypervisor
D) Cannot support multiple guest OSes
Answer: B — Type 1 (bare-metal) hypervisors run directly on hardware
(e.g., VMware ESXi).
6. Which of the following is a Type 2 hypervisor?
A) VMware ESXi
B) Microsoft Hyper-V
C) Oracle VirtualBox
D) Citrix XenServer
Answer: C — VirtualBox runs as an application on a host OS, making it a
Type 2 hypervisor.
7. What hardware feature allows the CPU to switch between user mode
and kernel mode?
A) Memory Management Unit (MMU)
B) Mode bit
C) Program Counter
D) Arithmetic Logic Unit
Answer: B — The mode bit indicates current CPU privilege level (0 =
kernel, 1 = user).
8. Which OS function is NOT a core responsibility of the operating
system?
, A) Process management
B) Memory management
C) Compiling source code
D) File system management
Answer: C — Compiling is handled by compilers, not the OS itself (though
the OS provides execution context).
9. In a microkernel, most services run in:
A) Kernel space
B) User space
C) Hypervisor space
D) Firmware
Answer: B — Microkernels keep only core services in kernel space; drivers
and other services run in user space.
10. Which statement about hybrid kernels is true?
A) They are slower than monolithic kernels but more stable
B) They combine features of monolithic and microkernel designs
C) They are only used in embedded systems
D) They cannot support multiple CPUs
Answer: B — Hybrid kernels (e.g., Windows NT, macOS XNU) blend
monolithic performance with microkernel modularity.
