1|Page
WGU D413 OBJECTIVE ASSESSMENT AND PRE-
ASSESSMENT LATEST 2026 TEST BANK| D413
TELECOMM AND WIRELESS COMMUNICATIONS OA
& PA EXAM WITH COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
GRADED A+ (BRAND NEW!!)
What is one type of waveform used to transmit electromagnetic signals
in wireless media?
1. Radio waves
2. Ultraviolet waves
3. Thermal waves
4. Gamma waves -Correct Answer- Radio waves
What is the wireless service that enables people to have access to mobile
internet?
1. Cellular digital packet data (CDPD)
2. Bluetooth
3. Ethernet
4. Wireless Application Protocol (WAP) -Correct Answer- Cellular
digital packet data (CDPD)
Which waves have higher frequencies than infrared transmission
frequencies?
pg. 1
,2|Page
1. Visible light waves
2. Microwaves
3. Radio waves
4. Electromagnetic waves -Correct Answer- Visible light waves
Which type of waves are used in Bluetooth transmission?
1. Low-power radio waves
2. High-power radio waves
3. Low-power ultraviolet waves
4. High-power ultraviolet waves -Correct Answer- Low-power radio
waves
How are stutters counteracted to improve the quality of Voice over
Internet Protocol (VoIP)?
1. By installing jitter buffers
2. By using analog signal transmission
3. By installing VPN software
4. By using a higher signal frequency -Correct Answer- By installing
jitter buffers
Which wireless security feature hides the contents of network packets to
ensure data can be transmitted over a wireless network safely?
1. Intrusion detection system
pg. 2
,3|Page
2. Application gateway
3. Authentication
4. Encryption key -Correct Answer- Encryption key
Which multiplexing technique transmits each signal from one input
source via a single time slot through the creation of different slots?
1. Synchronous time-division multiplexing
2. Asynchronous time-division multiplexing
3. Integrated Services Digital Network (ISDN) multiplexing
4. Transmission System 1 multiplexing -Correct Answer- Synchronous
time-division multiplexing
Which category of multiplexing randomly allocates time slots to
different data signals depending on the rate at which they are being
generated from the source?
1. Asynchronous time-division multiplexing
2. Synchronous time-division multiplexing
3. Dense wavelength-division multiplexing
4. Code-division multiplexing -Correct Answer- Asynchronous time-
division multiplexing
Which type of modem has been branded as a broadband device?
1. Cable modem
pg. 3
, 4|Page
2. 56k modem
3. CSU/DSU modem
4. Satellite modem -Correct Answer- Cable modem
Which type of modem has the slowest transmission rate?
1. 56k modem
2. Cable modem
3. DSL modem
4. ISDN modem -Correct Answer- 56k modem
Which networking component is used to provide a device with a
wireless connection point to a network?
1. Router
2. Server
3. Switch
4. Client -Correct Answer- Router
A network administrator wants to extend the range of wireless
connectivity within the network.
Which device is used for this purpose?
1. Repeater
2. Switch
3. Hub
pg. 4
WGU D413 OBJECTIVE ASSESSMENT AND PRE-
ASSESSMENT LATEST 2026 TEST BANK| D413
TELECOMM AND WIRELESS COMMUNICATIONS OA
& PA EXAM WITH COMPLETE 550 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS/
GRADED A+ (BRAND NEW!!)
What is one type of waveform used to transmit electromagnetic signals
in wireless media?
1. Radio waves
2. Ultraviolet waves
3. Thermal waves
4. Gamma waves -Correct Answer- Radio waves
What is the wireless service that enables people to have access to mobile
internet?
1. Cellular digital packet data (CDPD)
2. Bluetooth
3. Ethernet
4. Wireless Application Protocol (WAP) -Correct Answer- Cellular
digital packet data (CDPD)
Which waves have higher frequencies than infrared transmission
frequencies?
pg. 1
,2|Page
1. Visible light waves
2. Microwaves
3. Radio waves
4. Electromagnetic waves -Correct Answer- Visible light waves
Which type of waves are used in Bluetooth transmission?
1. Low-power radio waves
2. High-power radio waves
3. Low-power ultraviolet waves
4. High-power ultraviolet waves -Correct Answer- Low-power radio
waves
How are stutters counteracted to improve the quality of Voice over
Internet Protocol (VoIP)?
1. By installing jitter buffers
2. By using analog signal transmission
3. By installing VPN software
4. By using a higher signal frequency -Correct Answer- By installing
jitter buffers
Which wireless security feature hides the contents of network packets to
ensure data can be transmitted over a wireless network safely?
1. Intrusion detection system
pg. 2
,3|Page
2. Application gateway
3. Authentication
4. Encryption key -Correct Answer- Encryption key
Which multiplexing technique transmits each signal from one input
source via a single time slot through the creation of different slots?
1. Synchronous time-division multiplexing
2. Asynchronous time-division multiplexing
3. Integrated Services Digital Network (ISDN) multiplexing
4. Transmission System 1 multiplexing -Correct Answer- Synchronous
time-division multiplexing
Which category of multiplexing randomly allocates time slots to
different data signals depending on the rate at which they are being
generated from the source?
1. Asynchronous time-division multiplexing
2. Synchronous time-division multiplexing
3. Dense wavelength-division multiplexing
4. Code-division multiplexing -Correct Answer- Asynchronous time-
division multiplexing
Which type of modem has been branded as a broadband device?
1. Cable modem
pg. 3
, 4|Page
2. 56k modem
3. CSU/DSU modem
4. Satellite modem -Correct Answer- Cable modem
Which type of modem has the slowest transmission rate?
1. 56k modem
2. Cable modem
3. DSL modem
4. ISDN modem -Correct Answer- 56k modem
Which networking component is used to provide a device with a
wireless connection point to a network?
1. Router
2. Server
3. Switch
4. Client -Correct Answer- Router
A network administrator wants to extend the range of wireless
connectivity within the network.
Which device is used for this purpose?
1. Repeater
2. Switch
3. Hub
pg. 4
