WGU D413 – TELECOMMUNICATION AND
WIRELESS COMMUNICATION |
OBJECTIVE ASSESSMENT | OA V1 AND
V2 | QUESTIONS AND ANSWERS | 100%
CORRECT
WGU D413 – Telecommunication & Wireless
Communication
⏱ Timed Objective Assessment
Time Limit: 120 minutes
Total Questions: 60
Passing Target: 80%+
WGU D413 – OBJECTIVE ASSESSMENT VERSION 1
SECTION 1: TELECOMMUNICATION FUNDAMENTALS
(Q1–Q10)
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
Rationale:
A modem (modulator-demodulator) converts digital data to analog for
transmission and back again for reception.
,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
Rationale:
Multiplexing allows multiple data streams to share a single
transmission medium, improving efficiency.
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
Rationale:
Fiber-optic cables transmit data as light, offering extremely high
bandwidth and minimal interference.
4. Which factor MOST affects signal attenuation?
,A. Encryption
B. Distance
C. Compression
D. Switching
✅ Correct Answer: B
Rationale:
Signal strength decreases over distance, known as attenuation.
5. Which OSI layer handles signal transmission over the
medium?
A. Data Link
B. Network
C. Physical
D. Transport
✅ Correct Answer: C
Rationale:
The Physical layer manages electrical, optical, and radio signals.
6. Which device forwards packets based on IP address?
A. Hub
B. Switch
C. Router
D. Repeater
✅ Correct Answer: C
Rationale:
Routers operate at the Network layer using IP addresses to route traffic.
, 7. What does latency measure?
A. Error rate
B. Bandwidth
C. Delay in transmission
D. Signal strength
✅ Correct Answer: C
Rationale:
Latency is the time delay between sending and receiving data.
8. Which communication is full-duplex?
A. Walkie-talkie
B. Broadcast radio
C. Telephone call
D. Paging system
✅ Correct Answer: C
Rationale:
Full-duplex allows simultaneous two-way communication, like phone
calls.
9. What type of switching establishes a dedicated path?
A. Packet switching
B. Circuit switching
WIRELESS COMMUNICATION |
OBJECTIVE ASSESSMENT | OA V1 AND
V2 | QUESTIONS AND ANSWERS | 100%
CORRECT
WGU D413 – Telecommunication & Wireless
Communication
⏱ Timed Objective Assessment
Time Limit: 120 minutes
Total Questions: 60
Passing Target: 80%+
WGU D413 – OBJECTIVE ASSESSMENT VERSION 1
SECTION 1: TELECOMMUNICATION FUNDAMENTALS
(Q1–Q10)
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
Rationale:
A modem (modulator-demodulator) converts digital data to analog for
transmission and back again for reception.
,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
Rationale:
Multiplexing allows multiple data streams to share a single
transmission medium, improving efficiency.
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
Rationale:
Fiber-optic cables transmit data as light, offering extremely high
bandwidth and minimal interference.
4. Which factor MOST affects signal attenuation?
,A. Encryption
B. Distance
C. Compression
D. Switching
✅ Correct Answer: B
Rationale:
Signal strength decreases over distance, known as attenuation.
5. Which OSI layer handles signal transmission over the
medium?
A. Data Link
B. Network
C. Physical
D. Transport
✅ Correct Answer: C
Rationale:
The Physical layer manages electrical, optical, and radio signals.
6. Which device forwards packets based on IP address?
A. Hub
B. Switch
C. Router
D. Repeater
✅ Correct Answer: C
Rationale:
Routers operate at the Network layer using IP addresses to route traffic.
, 7. What does latency measure?
A. Error rate
B. Bandwidth
C. Delay in transmission
D. Signal strength
✅ Correct Answer: C
Rationale:
Latency is the time delay between sending and receiving data.
8. Which communication is full-duplex?
A. Walkie-talkie
B. Broadcast radio
C. Telephone call
D. Paging system
✅ Correct Answer: C
Rationale:
Full-duplex allows simultaneous two-way communication, like phone
calls.
9. What type of switching establishes a dedicated path?
A. Packet switching
B. Circuit switching
