WGU D413 Objective Assessment |
Telecommunications & Wireless Network OA
V1 and V2 | Questions and Answers | 2026
Update | 100% Correct.
Section 1: Telecommunications Fundamentals
Question 1
Which component converts digital signals into analog signals for transmission over
traditional phone lines?
A. Router
B. Switch
C. Modem
D. Repeater
Correct Answer: C. Modem
Rationale: A modem (modulator-demodulator) converts digital data from a computer
into analog signals for transmission over traditional phone lines and converts incoming
analog signals back to digital data. Routers direct network traffic, switches connect
devices within a network, and repeaters amplify signals .
Question 2
What is the primary purpose of multiplexing?
,A. Error correction
B. Combining multiple signals into one channel
C. Increasing signal strength
D. Encrypting data
Correct Answer: B. Combining multiple signals into one channel
Rationale: Multiplexing allows multiple data streams to share a single transmission
medium simultaneously, improving efficiency and maximizing the use of available
bandwidth .
Question 3
Which transmission medium provides the highest bandwidth and lowest signal loss?
A. Coaxial cable
B. Twisted pair
C. Fiber-optic cable
D. Microwave
Correct Answer: C. Fiber-optic cable
Rationale: Fiber-optic cables transmit data as pulses of light, offering extremely high
bandwidth, minimal signal attenuation, and immunity to electromagnetic interference
compared to copper-based media .
Question 4
Which factor MOST affects signal attenuation?
A. Encryption type
B. Transmission distance
C. Network protocol
D. Data packet size
Correct Answer: B. Transmission distance
,Rationale: Attenuation is the loss of signal strength as it travels over distance. The
longer the transmission distance, the greater the signal degradation .
Question 5
What does latency measure in a network?
A. Error rate
B. Bandwidth capacity
C. Delay in transmission
D. Signal strength
Correct Answer: C. Delay in transmission
Rationale: Latency is the time delay between sending and receiving data. It represents
the time it takes for a data packet to travel from source to destination .
Question 6
Which type of communication is full-duplex?
A. Walkie-talkie
B. Broadcast radio
C. Telephone call
D. Paging system
Correct Answer: C. Telephone call
Rationale: Full-duplex communication allows simultaneous two-way transmission. A
telephone call enables both parties to speak and hear at the same time .
Question 7
, What type of switching establishes a dedicated path for the entire communication
session?
A. Packet switching
B. Circuit switching
C. Frame relay
D. Cell switching
Correct Answer: B. Circuit switching
Rationale: Circuit switching creates a dedicated physical channel between two devices
for the duration of the session, reserving bandwidth for exclusive use .
Question 8
Which unit is used to measure bandwidth?
A. Volts
B. Hertz
C. Bits per second
D. Decibels
Correct Answer: C. Bits per second
Rationale: Bandwidth measures the maximum data transfer rate of a network path,
expressed in bits per second (bps) .
Question 9
What is the function of the OSI Transport layer?
A. Physical addressing
B. Routing packets
C. End-to-end error recovery and flow control
D. Application services
Telecommunications & Wireless Network OA
V1 and V2 | Questions and Answers | 2026
Update | 100% Correct.
Section 1: Telecommunications Fundamentals
Question 1
Which component converts digital signals into analog signals for transmission over
traditional phone lines?
A. Router
B. Switch
C. Modem
D. Repeater
Correct Answer: C. Modem
Rationale: A modem (modulator-demodulator) converts digital data from a computer
into analog signals for transmission over traditional phone lines and converts incoming
analog signals back to digital data. Routers direct network traffic, switches connect
devices within a network, and repeaters amplify signals .
Question 2
What is the primary purpose of multiplexing?
,A. Error correction
B. Combining multiple signals into one channel
C. Increasing signal strength
D. Encrypting data
Correct Answer: B. Combining multiple signals into one channel
Rationale: Multiplexing allows multiple data streams to share a single transmission
medium simultaneously, improving efficiency and maximizing the use of available
bandwidth .
Question 3
Which transmission medium provides the highest bandwidth and lowest signal loss?
A. Coaxial cable
B. Twisted pair
C. Fiber-optic cable
D. Microwave
Correct Answer: C. Fiber-optic cable
Rationale: Fiber-optic cables transmit data as pulses of light, offering extremely high
bandwidth, minimal signal attenuation, and immunity to electromagnetic interference
compared to copper-based media .
Question 4
Which factor MOST affects signal attenuation?
A. Encryption type
B. Transmission distance
C. Network protocol
D. Data packet size
Correct Answer: B. Transmission distance
,Rationale: Attenuation is the loss of signal strength as it travels over distance. The
longer the transmission distance, the greater the signal degradation .
Question 5
What does latency measure in a network?
A. Error rate
B. Bandwidth capacity
C. Delay in transmission
D. Signal strength
Correct Answer: C. Delay in transmission
Rationale: Latency is the time delay between sending and receiving data. It represents
the time it takes for a data packet to travel from source to destination .
Question 6
Which type of communication is full-duplex?
A. Walkie-talkie
B. Broadcast radio
C. Telephone call
D. Paging system
Correct Answer: C. Telephone call
Rationale: Full-duplex communication allows simultaneous two-way transmission. A
telephone call enables both parties to speak and hear at the same time .
Question 7
, What type of switching establishes a dedicated path for the entire communication
session?
A. Packet switching
B. Circuit switching
C. Frame relay
D. Cell switching
Correct Answer: B. Circuit switching
Rationale: Circuit switching creates a dedicated physical channel between two devices
for the duration of the session, reserving bandwidth for exclusive use .
Question 8
Which unit is used to measure bandwidth?
A. Volts
B. Hertz
C. Bits per second
D. Decibels
Correct Answer: C. Bits per second
Rationale: Bandwidth measures the maximum data transfer rate of a network path,
expressed in bits per second (bps) .
Question 9
What is the function of the OSI Transport layer?
A. Physical addressing
B. Routing packets
C. End-to-end error recovery and flow control
D. Application services
