WGU D413 OBJECTIVE ASSESSMENT 2 LATEST
EXAM TEST BANK| D413 TELECOMM AND
WIRELESS COMMUNICATIONS OA FINAL
EXAM 2026/2027 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |CURRENTLY TESTING QUESTIONS
AND SOLUTIONS|ALREADY GRADED
A+|NEWEST |BRAND NEW VERSION!!| |LATEST
UPDATE
1. Which factor most directly affects wireless signal attenuation in indoor
environments?
A. Modulation type
B. Physical obstacles like walls
C. IP addressing scheme
D. MAC address filtering
Answer: B — Physical obstacles like walls
Explanation: Walls, metal, and concrete absorb or reflect RF signals, reducing signal
strength (attenuation). This is one of the biggest real-world factors in wireless
performance.
2. Why does 5 GHz Wi-Fi typically provide higher data rates than 2.4 GHz?
1|Page
,A. Lower frequency waves travel faster
B. It uses more power
C. It has wider available channels and less interference
D. It penetrates walls better
Answer: C — Wider channels and less interference
Explanation: 5 GHz offers more non-overlapping channels and wider bandwidth (e.g.,
40/80/160 MHz), allowing higher throughput.
3. What is the primary purpose of modulation in wireless communication?
A. Encrypt data
B. Convert digital signals into radio waves
C. Assign IP addresses
D. Route packets
Answer: B — Convert digital signals into radio waves
Explanation: Modulation encodes data onto a carrier wave so it can be transmitted
over the air.
4. Which multiplexing technique divides a signal into time slots?
A. FDM
B. CDMA
C. TDM
D. OFDM
Answer: C — TDM (Time Division Multiplexing)
Explanation: TDM assigns different time slots to multiple signals sharing the same
channel.
2|Page
,5. Which wireless security protocol is currently the most secure?
A. WEP
B. WPA
C. WPA2
D. WPA3
Answer: D — WPA3
Explanation: WPA3 improves encryption and protects against brute-force attacks
using SAE (Simultaneous Authentication of Equals).
6. What type of antenna radiates signal equally in all directions?
A. Yagi
B. Parabolic
C. Omnidirectional
D. Patch
Answer: C — Omnidirectional
Explanation: Used in Wi-Fi routers to provide coverage in all directions.
7. What does LTE stand for?
A. Long-Term Ethernet
B. Long-Term Evolution
C. Low Transmission Efficiency
D. Layered Transmission Engine
Answer: B — Long-Term Evolution
Explanation: LTE is a 4G wireless broadband standard.
3|Page
, 8. Which phenomenon occurs when a signal bends around an obstacle?
A. Reflection
B. Refraction
C. Diffraction
D. Absorption
Answer: C — Diffraction
Explanation: Diffraction allows signals to propagate beyond obstacles.
9. Which layer of the OSI model handles wireless transmission?
A. Network
B. Transport
C. Physical
D. Application
Answer: C — Physical Layer
Explanation: The physical layer is responsible for transmitting raw bits over a medium.
10. What is the main advantage of OFDM in wireless systems?
A. Reduces encryption overhead
B. Improves resistance to interference and multipath
C. Eliminates need for modulation
D. Increases transmission power
Answer: B — Improves resistance to interference
Explanation: OFDM splits signals into multiple subcarriers, making it robust in noisy
environments.
4|Page
EXAM TEST BANK| D413 TELECOMM AND
WIRELESS COMMUNICATIONS OA FINAL
EXAM 2026/2027 WITH ACTUAL CORRECT
QUESTIONS AND VERIFIED DETAILED
ANSWERS |CURRENTLY TESTING QUESTIONS
AND SOLUTIONS|ALREADY GRADED
A+|NEWEST |BRAND NEW VERSION!!| |LATEST
UPDATE
1. Which factor most directly affects wireless signal attenuation in indoor
environments?
A. Modulation type
B. Physical obstacles like walls
C. IP addressing scheme
D. MAC address filtering
Answer: B — Physical obstacles like walls
Explanation: Walls, metal, and concrete absorb or reflect RF signals, reducing signal
strength (attenuation). This is one of the biggest real-world factors in wireless
performance.
2. Why does 5 GHz Wi-Fi typically provide higher data rates than 2.4 GHz?
1|Page
,A. Lower frequency waves travel faster
B. It uses more power
C. It has wider available channels and less interference
D. It penetrates walls better
Answer: C — Wider channels and less interference
Explanation: 5 GHz offers more non-overlapping channels and wider bandwidth (e.g.,
40/80/160 MHz), allowing higher throughput.
3. What is the primary purpose of modulation in wireless communication?
A. Encrypt data
B. Convert digital signals into radio waves
C. Assign IP addresses
D. Route packets
Answer: B — Convert digital signals into radio waves
Explanation: Modulation encodes data onto a carrier wave so it can be transmitted
over the air.
4. Which multiplexing technique divides a signal into time slots?
A. FDM
B. CDMA
C. TDM
D. OFDM
Answer: C — TDM (Time Division Multiplexing)
Explanation: TDM assigns different time slots to multiple signals sharing the same
channel.
2|Page
,5. Which wireless security protocol is currently the most secure?
A. WEP
B. WPA
C. WPA2
D. WPA3
Answer: D — WPA3
Explanation: WPA3 improves encryption and protects against brute-force attacks
using SAE (Simultaneous Authentication of Equals).
6. What type of antenna radiates signal equally in all directions?
A. Yagi
B. Parabolic
C. Omnidirectional
D. Patch
Answer: C — Omnidirectional
Explanation: Used in Wi-Fi routers to provide coverage in all directions.
7. What does LTE stand for?
A. Long-Term Ethernet
B. Long-Term Evolution
C. Low Transmission Efficiency
D. Layered Transmission Engine
Answer: B — Long-Term Evolution
Explanation: LTE is a 4G wireless broadband standard.
3|Page
, 8. Which phenomenon occurs when a signal bends around an obstacle?
A. Reflection
B. Refraction
C. Diffraction
D. Absorption
Answer: C — Diffraction
Explanation: Diffraction allows signals to propagate beyond obstacles.
9. Which layer of the OSI model handles wireless transmission?
A. Network
B. Transport
C. Physical
D. Application
Answer: C — Physical Layer
Explanation: The physical layer is responsible for transmitting raw bits over a medium.
10. What is the main advantage of OFDM in wireless systems?
A. Reduces encryption overhead
B. Improves resistance to interference and multipath
C. Eliminates need for modulation
D. Increases transmission power
Answer: B — Improves resistance to interference
Explanation: OFDM splits signals into multiple subcarriers, making it robust in noisy
environments.
4|Page
