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WGU D075 IT Foundations OA Exam -
Multiple Choice Questions 1-300 and
complete rationales 2026
Questions 1-50
Q1: What is the primary function of an operating system?
A) Run application software
B) Manage computer hardware and software resources
C) Create documents and spreadsheets
D) Connect to the internet
Correct Answer: B) Manage computer hardware and software resources
Rationale: The operating system serves as the foundation that manages all
computer resources, including memory, processing, storage, and peripheral
devices. While it does run applications (A), this is a secondary function.
Creating documents (C) is done by application software, and connecting to the
internet (D) requires the OS but isn't its primary purpose. The OS acts as an
intermediary between the user, applications, and hardware, making B the most
complete answer.
Q2: Which type of software performs background functions requiring minimal
user interaction but is essential for computer operation?
A) Application software
B) Firmware
C) Utility software
D) System software
Correct Answer: C) Utility software
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Rationale: Utility software performs essential background tasks like disk
management, virus scanning, and file compression with little user interaction.
Application software (A) is user-facing programs like word processors.
Firmware (B) is a specific type of software embedded in hardware. System
software (D) is a broader category that includes both utilities and operating
systems. Utility software best fits the description of performing background
functions.
Q3: What hardware component is considered the "brains" of the computer and
performs most calculations?
A) GPU
B) RAM
C) CPU
D) SSD
Correct Answer: C) CPU (Central Processing Unit)
Rationale: The CPU executes instructions and performs calculations for nearly
all computer operations. The GPU (A) handles graphics rendering, RAM (B)
provides temporary storage for data, and SSD (D) is a storage device. The CPU's
role as the primary processing unit makes it correctly identified as the
computer's "brains."
Q4: What does Moore's Law state about computing technology?
A) Storage capacity doubles annually
B) Processing power doubles approximately every 18 months
C) Network speeds double every year
D) Computer costs decrease by half every 5 years
Correct Answer: B) Processing power doubles approximately every 18 months
Rationale: Gordon Moore's observation states that the number of transistors on
a microchip doubles about every two years (often cited as 18 months),
effectively doubling processing power. Storage capacity (A) follows similar
trends but isn't Moore's Law. Network speeds (C) and cost reductions (D) aren't
part of this specific observation, though they are related technological trends.
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Q5: What is the purpose of a USB port on a computer?
A) Provide power to the computer
B) Connect peripheral devices
C) Connect to the internet
D) Display video output
Correct Answer: B) Connect peripheral devices
Rationale: USB ports are universal connectivity interfaces for peripherals like
keyboards, mice, printers, external drives, and cameras. While USB can provide
power (A), that's not its primary purpose. Internet connectivity (C) typically uses
Ethernet or Wi-Fi. Video output (D) uses HDMI, DisplayPort, or VGA, not USB
(though some USB-C ports can carry video signals).
Q6: What is a MAC address used for in networking?
A) Identify a computer's location on the internet
B) Uniquely identify a computer on a local network
C) Encrypt data transmitted over a network
D) Assign IP addresses to devices
Correct Answer: B) Uniquely identify a computer on a local network
Rationale: A MAC (Media Access Control) address is a hardware-level identifier
burned into network interface controllers, uniquely identifying each device on a
local network. IP addresses (A) identify location on the internet. Encryption (C)
uses protocols like SSL/TLS. DHCP servers (D) assign IP addresses, not MAC
addresses.
Q7: In a star network topology, what happens when the central hub fails?
A) The network continues to function normally
B) All attached nodes fail to communicate
C) Only the hub needs to be reset
D) Nodes automatically switch to mesh topology
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Correct Answer: B) All attached nodes fail to communicate
Rationale: In a star topology, all nodes connect through a central hub or switch.
If the central hub fails, communication between all connected nodes ceases
because there's no alternative path. This is a key weakness of star topology.
Other topologies like mesh (D) have redundancy, but star topology does not.
The network cannot continue normally (A) without its central connection point.
Q8: What is the purpose of an Ethernet card (Network Interface Card)?
A) Enable wireless internet connectivity
B) Enable a computer to connect to a wired network
C) Store network configuration data
D) Encrypt network traffic
Correct Answer: B) Enable a computer to connect to a wired network
Rationale: A Network Interface Card (NIC) provides the physical connection
point for a computer to join a wired Ethernet network. Wireless connectivity (A)
uses Wi-Fi adapters. Network configuration (C) is stored in the operating
system. Encryption (D) is handled by software protocols, not the NIC itself.
Q9: What must a user provide to be authenticated after connecting to a secured
LAN?
A) MAC address
B) IP address
C) Password
D) Ethernet cable
Correct Answer: C) Password
Rationale: After establishing physical network connectivity, authentication
requires credentials, typically a username and password. MAC addresses (A)
identify hardware but aren't authentication credentials. IP addresses (B) are
assigned after authentication. An Ethernet cable (D) provides physical
connectivity but doesn't authenticate the user.
WGU D075 IT Foundations OA Exam -
Multiple Choice Questions 1-300 and
complete rationales 2026
Questions 1-50
Q1: What is the primary function of an operating system?
A) Run application software
B) Manage computer hardware and software resources
C) Create documents and spreadsheets
D) Connect to the internet
Correct Answer: B) Manage computer hardware and software resources
Rationale: The operating system serves as the foundation that manages all
computer resources, including memory, processing, storage, and peripheral
devices. While it does run applications (A), this is a secondary function.
Creating documents (C) is done by application software, and connecting to the
internet (D) requires the OS but isn't its primary purpose. The OS acts as an
intermediary between the user, applications, and hardware, making B the most
complete answer.
Q2: Which type of software performs background functions requiring minimal
user interaction but is essential for computer operation?
A) Application software
B) Firmware
C) Utility software
D) System software
Correct Answer: C) Utility software
,2|Page
Rationale: Utility software performs essential background tasks like disk
management, virus scanning, and file compression with little user interaction.
Application software (A) is user-facing programs like word processors.
Firmware (B) is a specific type of software embedded in hardware. System
software (D) is a broader category that includes both utilities and operating
systems. Utility software best fits the description of performing background
functions.
Q3: What hardware component is considered the "brains" of the computer and
performs most calculations?
A) GPU
B) RAM
C) CPU
D) SSD
Correct Answer: C) CPU (Central Processing Unit)
Rationale: The CPU executes instructions and performs calculations for nearly
all computer operations. The GPU (A) handles graphics rendering, RAM (B)
provides temporary storage for data, and SSD (D) is a storage device. The CPU's
role as the primary processing unit makes it correctly identified as the
computer's "brains."
Q4: What does Moore's Law state about computing technology?
A) Storage capacity doubles annually
B) Processing power doubles approximately every 18 months
C) Network speeds double every year
D) Computer costs decrease by half every 5 years
Correct Answer: B) Processing power doubles approximately every 18 months
Rationale: Gordon Moore's observation states that the number of transistors on
a microchip doubles about every two years (often cited as 18 months),
effectively doubling processing power. Storage capacity (A) follows similar
trends but isn't Moore's Law. Network speeds (C) and cost reductions (D) aren't
part of this specific observation, though they are related technological trends.
,3|Page
Q5: What is the purpose of a USB port on a computer?
A) Provide power to the computer
B) Connect peripheral devices
C) Connect to the internet
D) Display video output
Correct Answer: B) Connect peripheral devices
Rationale: USB ports are universal connectivity interfaces for peripherals like
keyboards, mice, printers, external drives, and cameras. While USB can provide
power (A), that's not its primary purpose. Internet connectivity (C) typically uses
Ethernet or Wi-Fi. Video output (D) uses HDMI, DisplayPort, or VGA, not USB
(though some USB-C ports can carry video signals).
Q6: What is a MAC address used for in networking?
A) Identify a computer's location on the internet
B) Uniquely identify a computer on a local network
C) Encrypt data transmitted over a network
D) Assign IP addresses to devices
Correct Answer: B) Uniquely identify a computer on a local network
Rationale: A MAC (Media Access Control) address is a hardware-level identifier
burned into network interface controllers, uniquely identifying each device on a
local network. IP addresses (A) identify location on the internet. Encryption (C)
uses protocols like SSL/TLS. DHCP servers (D) assign IP addresses, not MAC
addresses.
Q7: In a star network topology, what happens when the central hub fails?
A) The network continues to function normally
B) All attached nodes fail to communicate
C) Only the hub needs to be reset
D) Nodes automatically switch to mesh topology
, 4|Page
Correct Answer: B) All attached nodes fail to communicate
Rationale: In a star topology, all nodes connect through a central hub or switch.
If the central hub fails, communication between all connected nodes ceases
because there's no alternative path. This is a key weakness of star topology.
Other topologies like mesh (D) have redundancy, but star topology does not.
The network cannot continue normally (A) without its central connection point.
Q8: What is the purpose of an Ethernet card (Network Interface Card)?
A) Enable wireless internet connectivity
B) Enable a computer to connect to a wired network
C) Store network configuration data
D) Encrypt network traffic
Correct Answer: B) Enable a computer to connect to a wired network
Rationale: A Network Interface Card (NIC) provides the physical connection
point for a computer to join a wired Ethernet network. Wireless connectivity (A)
uses Wi-Fi adapters. Network configuration (C) is stored in the operating
system. Encryption (D) is handled by software protocols, not the NIC itself.
Q9: What must a user provide to be authenticated after connecting to a secured
LAN?
A) MAC address
B) IP address
C) Password
D) Ethernet cable
Correct Answer: C) Password
Rationale: After establishing physical network connectivity, authentication
requires credentials, typically a username and password. MAC addresses (A)
identify hardware but aren't authentication credentials. IP addresses (B) are
assigned after authentication. An Ethernet cable (D) provides physical
connectivity but doesn't authenticate the user.
