WGU D413 Telecommunications and Wireless
Communications – 150 Practice Questions & Answers
Complete Objective Assessment Study Guide | Latest
2026/2027 | 100% Verified
This comprehensive document contains 150 practice questions for the WGU D413
Telecommunications and Wireless Communications Objective Assessment, covering
network fundamentals, OSI and TCP/IP models, cabling and transmission media, wireless
technologies, multiplexing, protocols, and security . Each answer includes the correct option
in bold with a detailed rationale.
SECTION 1: NETWORK FUNDAMENTALS & ARCHITECTURE (Questions 1–30)
1. What is the primary purpose of a network switch?
A) To broadcast data to all connected devices
B) To connect multiple devices and forward data only to the intended recipient using
MAC addresses
C) To convert digital signals into analog signals
D) To amplify and regenerate signals over long distances
Answer: B
Switches operate at Layer 2 of the OSI model and use MAC addresses to forward frames
intelligently, reducing collisions and improving network efficiency compared to hubs .
,2. Which OSI layer is responsible for reliable data delivery, error detection, and
retransmission?
A) Network Layer
B) Data Link Layer
C) Transport Layer
D) Physical Layer
Answer: C
The Transport Layer (Layer 4) manages end-to-end communication, error recovery, flow
control, and segmentation. Protocols like TCP operate at this layer to ensure reliable data
delivery .
3. Which component converts digital signals into analog signals for transmission
over traditional phone lines?
A) Router
B) Switch
C) Modem
D) Repeater
Answer: C
A modem (modulator-demodulator) converts digital data to analog for transmission over
analog lines (e.g., POTS) and back again for reception. The term is a combination of
modulator and demodulator .
4. What is the primary function of a router in a network?
,A) Connect multiple devices within the same LAN
B) Forward data between different networks based on IP addresses
C) Amplify signals to extend network reach
D) Assign IP addresses automatically
Answer: B
Routers operate at Layer 3 of the OSI model and use IP addresses to determine the best
path for forwarding data between different networks .
5. Which topology provides redundancy because each node has a dedicated point-to-
point connection to every other node?
A) Star topology
B) Bus topology
C) Ring topology
D) Mesh topology
Answer: D
In a mesh topology, each node has a dedicated point-to-point connection to every other
node, providing redundancy and fault tolerance but requiring many connections .
6. What is the main advantage of a star topology?
A) Redundancy of connections
B) Easy fault isolation because each device connects to a central hub
C) Minimal cabling requirements
D) High tolerance to cable breaks
, Answer: B
In a star topology, each device is connected directly to a central switch or hub. If one cable
fails, only that device is affected, making fault isolation straightforward .
7. What does a repeater do?
A) It connects two different network types
B) It amplifies and regenerates a signal to extend the transmission distance
C) It filters packets based on IP addresses
D) It converts analog signals to digital
Answer: B
A repeater operates at the Physical Layer (Layer 1) and restores signal strength and shape,
allowing data to travel longer distances without degradation .
8. Which technology uses electromagnetic fields to identify and track objects
equipped with tags or chips?
A) OFDM
B) RFID (Radio-Frequency Identification)
C) WDM
D) TDM
Answer: B
RFID uses electromagnetic fields to automatically identify and track tags attached to
objects. Tags contain electronically stored information .
Communications – 150 Practice Questions & Answers
Complete Objective Assessment Study Guide | Latest
2026/2027 | 100% Verified
This comprehensive document contains 150 practice questions for the WGU D413
Telecommunications and Wireless Communications Objective Assessment, covering
network fundamentals, OSI and TCP/IP models, cabling and transmission media, wireless
technologies, multiplexing, protocols, and security . Each answer includes the correct option
in bold with a detailed rationale.
SECTION 1: NETWORK FUNDAMENTALS & ARCHITECTURE (Questions 1–30)
1. What is the primary purpose of a network switch?
A) To broadcast data to all connected devices
B) To connect multiple devices and forward data only to the intended recipient using
MAC addresses
C) To convert digital signals into analog signals
D) To amplify and regenerate signals over long distances
Answer: B
Switches operate at Layer 2 of the OSI model and use MAC addresses to forward frames
intelligently, reducing collisions and improving network efficiency compared to hubs .
,2. Which OSI layer is responsible for reliable data delivery, error detection, and
retransmission?
A) Network Layer
B) Data Link Layer
C) Transport Layer
D) Physical Layer
Answer: C
The Transport Layer (Layer 4) manages end-to-end communication, error recovery, flow
control, and segmentation. Protocols like TCP operate at this layer to ensure reliable data
delivery .
3. Which component converts digital signals into analog signals for transmission
over traditional phone lines?
A) Router
B) Switch
C) Modem
D) Repeater
Answer: C
A modem (modulator-demodulator) converts digital data to analog for transmission over
analog lines (e.g., POTS) and back again for reception. The term is a combination of
modulator and demodulator .
4. What is the primary function of a router in a network?
,A) Connect multiple devices within the same LAN
B) Forward data between different networks based on IP addresses
C) Amplify signals to extend network reach
D) Assign IP addresses automatically
Answer: B
Routers operate at Layer 3 of the OSI model and use IP addresses to determine the best
path for forwarding data between different networks .
5. Which topology provides redundancy because each node has a dedicated point-to-
point connection to every other node?
A) Star topology
B) Bus topology
C) Ring topology
D) Mesh topology
Answer: D
In a mesh topology, each node has a dedicated point-to-point connection to every other
node, providing redundancy and fault tolerance but requiring many connections .
6. What is the main advantage of a star topology?
A) Redundancy of connections
B) Easy fault isolation because each device connects to a central hub
C) Minimal cabling requirements
D) High tolerance to cable breaks
, Answer: B
In a star topology, each device is connected directly to a central switch or hub. If one cable
fails, only that device is affected, making fault isolation straightforward .
7. What does a repeater do?
A) It connects two different network types
B) It amplifies and regenerates a signal to extend the transmission distance
C) It filters packets based on IP addresses
D) It converts analog signals to digital
Answer: B
A repeater operates at the Physical Layer (Layer 1) and restores signal strength and shape,
allowing data to travel longer distances without degradation .
8. Which technology uses electromagnetic fields to identify and track objects
equipped with tags or chips?
A) OFDM
B) RFID (Radio-Frequency Identification)
C) WDM
D) TDM
Answer: B
RFID uses electromagnetic fields to automatically identify and track tags attached to
objects. Tags contain electronically stored information .
