WGU D413 – Telecommunications & Wireless
Communications Objective Assessment | OA
V1 and V2 | Questions and Answers | 2026
Update | 100% Correct.
Section I: Telecommunications Fundamentals
1. Which three components constitute the basic elements of any telecommunications system?
A. Transmitter, transmission medium, receiver
B. Encoder, modulator, demodulator
C. Source, switch, destination
D. Antenna, cable, amplifier
Correct Answer: A
Rationale: Every telecommunications system, regardless of complexity, consists of three
fundamental components: a transmitter that sends the signal, a transmission medium that
carries the signal, and a receiver that receives and interprets the signal . Encoders and
modulators are elements within the transmitter, not system-level components.
2. A network administrator is measuring the performance of a communication channel and
calculates the ratio of signal power to noise power. Which metric is being measured?
A. Bandwidth
B. Signal-to-Noise Ratio (SNR)
C. Latency
D. Throughput
Correct Answer: B
Rationale: The Signal-to-Noise Ratio (SNR) is defined as the ratio of the power of the
transmitted signal to the power of background noise. A higher SNR indicates better signal
quality and more reliable communication . Bandwidth measures frequency range, latency
measures delay, and throughput measures actual data transfer rate.
,3. What is the maximum data transfer capacity of a communication channel called?
A. Throughput
B. Latency
C. Bandwidth
D. Jitter
Correct Answer: C
Rationale: Bandwidth represents the maximum theoretical capacity of a network
communication link, typically measured in bits per second (bps) . Throughput refers to the
actual rate achieved, which is often lower than bandwidth due to various factors.
4. Which term describes the time delay between sending and receiving data?
A. Bandwidth
B. Latency
C. Throughput
D. Frequency
Correct Answer: B
Rationale: Latency is the time delay experienced in data transmission from source to
destination . For real-time applications like VoIP, latency is more critical than raw bandwidth
because excessive delay degrades call quality.
5. A network technician observes that the actual data transfer rate is significantly lower than
the theoretical maximum capacity of the link. Which term best describes the actual rate
achieved?
A. Bandwidth
B. Throughput
C. Latency
D. SNR
Correct Answer: B
Rationale: Throughput is the actual rate of successful data transmission, often lower than
the theoretical bandwidth due to protocol overhead, network congestion, and other factors .
,6. Which organization is a private, nonprofit entity that promotes voluntary conformity and
standardization but does not develop standards itself?
A. IEEE
B. ANSI
C. ISO
D. ITU
Correct Answer: B
Rationale: The American National Standards Institute (ANSI) is a private, nonprofit
organization that does not develop standards but rather prompts voluntary conformity and
standardization . IEEE, ISO, and ITU are actual standards development organizations.
7. What term describes a network spread across multiple buildings in the same geographical
location, such as a college campus?
A. Wide Area Network (WAN)
B. Campus Area Network (CAN)
C. Metropolitan Area Network (MAN)
D. Personal Area Network (PAN)
Correct Answer: B
Rationale: A Campus Area Network (CAN) connects multiple buildings within a limited
geographic area, such as a university campus or corporate headquarters .
8. Communication that happens in two directions simultaneously is known as:
A. Half duplex
B. Full duplex
C. Simplex
D. Multiplex
Correct Answer: B
Rationale: Full duplex allows simultaneous two-way communication, meaning data can be
transmitted and received at the same time . Half duplex allows two-way communication but
only one direction at a time.
, 9. What is the opposition to direct current (DC) called?
A. Impedance
B. Capacitance
C. Resistance
D. Inductance
Correct Answer: C
Rationale: Resistance opposes the flow of direct current (DC) and is measured in ohms (Ω).
Impedance opposes alternating current (AC) and is affected by frequency, cable length,
induction, and capacitance .
10. Which term is defined as the number of cycles a signal completes in one second?
A. Amplitude
B. Frequency
C. Wavelength
D. Phase
Correct Answer: B
Rationale: Frequency is the number of cycles per second, measured in Hertz (Hz) . It
represents how often a periodic waveform repeats within one second.
11. What describes the position of a point in time on a waveform cycle relative to a reference?
A. Frequency
B. Amplitude
C. Phase
D. Wavelength
Correct Answer: C
Rationale: Phase describes the position of a point in time on a waveform cycle relative to a
reference point . It is measured in degrees or radians.
12. Which network topology connects devices in a circular loop where each device connects
to two others?
Communications Objective Assessment | OA
V1 and V2 | Questions and Answers | 2026
Update | 100% Correct.
Section I: Telecommunications Fundamentals
1. Which three components constitute the basic elements of any telecommunications system?
A. Transmitter, transmission medium, receiver
B. Encoder, modulator, demodulator
C. Source, switch, destination
D. Antenna, cable, amplifier
Correct Answer: A
Rationale: Every telecommunications system, regardless of complexity, consists of three
fundamental components: a transmitter that sends the signal, a transmission medium that
carries the signal, and a receiver that receives and interprets the signal . Encoders and
modulators are elements within the transmitter, not system-level components.
2. A network administrator is measuring the performance of a communication channel and
calculates the ratio of signal power to noise power. Which metric is being measured?
A. Bandwidth
B. Signal-to-Noise Ratio (SNR)
C. Latency
D. Throughput
Correct Answer: B
Rationale: The Signal-to-Noise Ratio (SNR) is defined as the ratio of the power of the
transmitted signal to the power of background noise. A higher SNR indicates better signal
quality and more reliable communication . Bandwidth measures frequency range, latency
measures delay, and throughput measures actual data transfer rate.
,3. What is the maximum data transfer capacity of a communication channel called?
A. Throughput
B. Latency
C. Bandwidth
D. Jitter
Correct Answer: C
Rationale: Bandwidth represents the maximum theoretical capacity of a network
communication link, typically measured in bits per second (bps) . Throughput refers to the
actual rate achieved, which is often lower than bandwidth due to various factors.
4. Which term describes the time delay between sending and receiving data?
A. Bandwidth
B. Latency
C. Throughput
D. Frequency
Correct Answer: B
Rationale: Latency is the time delay experienced in data transmission from source to
destination . For real-time applications like VoIP, latency is more critical than raw bandwidth
because excessive delay degrades call quality.
5. A network technician observes that the actual data transfer rate is significantly lower than
the theoretical maximum capacity of the link. Which term best describes the actual rate
achieved?
A. Bandwidth
B. Throughput
C. Latency
D. SNR
Correct Answer: B
Rationale: Throughput is the actual rate of successful data transmission, often lower than
the theoretical bandwidth due to protocol overhead, network congestion, and other factors .
,6. Which organization is a private, nonprofit entity that promotes voluntary conformity and
standardization but does not develop standards itself?
A. IEEE
B. ANSI
C. ISO
D. ITU
Correct Answer: B
Rationale: The American National Standards Institute (ANSI) is a private, nonprofit
organization that does not develop standards but rather prompts voluntary conformity and
standardization . IEEE, ISO, and ITU are actual standards development organizations.
7. What term describes a network spread across multiple buildings in the same geographical
location, such as a college campus?
A. Wide Area Network (WAN)
B. Campus Area Network (CAN)
C. Metropolitan Area Network (MAN)
D. Personal Area Network (PAN)
Correct Answer: B
Rationale: A Campus Area Network (CAN) connects multiple buildings within a limited
geographic area, such as a university campus or corporate headquarters .
8. Communication that happens in two directions simultaneously is known as:
A. Half duplex
B. Full duplex
C. Simplex
D. Multiplex
Correct Answer: B
Rationale: Full duplex allows simultaneous two-way communication, meaning data can be
transmitted and received at the same time . Half duplex allows two-way communication but
only one direction at a time.
, 9. What is the opposition to direct current (DC) called?
A. Impedance
B. Capacitance
C. Resistance
D. Inductance
Correct Answer: C
Rationale: Resistance opposes the flow of direct current (DC) and is measured in ohms (Ω).
Impedance opposes alternating current (AC) and is affected by frequency, cable length,
induction, and capacitance .
10. Which term is defined as the number of cycles a signal completes in one second?
A. Amplitude
B. Frequency
C. Wavelength
D. Phase
Correct Answer: B
Rationale: Frequency is the number of cycles per second, measured in Hertz (Hz) . It
represents how often a periodic waveform repeats within one second.
11. What describes the position of a point in time on a waveform cycle relative to a reference?
A. Frequency
B. Amplitude
C. Phase
D. Wavelength
Correct Answer: C
Rationale: Phase describes the position of a point in time on a waveform cycle relative to a
reference point . It is measured in degrees or radians.
12. Which network topology connects devices in a circular loop where each device connects
to two others?
