WGU D413 Pre-Assessment 2026 [Latest] |
Telecommunications & Wireless Guide | 100%
Verified Q&A | Grade A
Question 1: Which ITU-R-defined band is most commonly used for modern 5G cellular
telecommunication below 6 GHz?
A) L-band
B) S-band
C) C-band
D) Ku-band
Correct Answer: C) C-band
Explanation: The 3.3–4.2 GHz portion of C-band has been globally allocated for 5G NR; it offers
the best compromise of coverage and bandwidth for macro-cell deployment.
Question 2: In a Wi-Fi 6 (802.11ax) BSS, the mechanism that divides the channel into smaller
sub-channels for simultaneous multi-user transmission is called:
A) MU-MIMO
B) OFDMA
, C) TDMA
D) DSSS
Correct Answer: B) OFDMA
Explanation: Orthogonal Frequency-Division Multiple Access allocates sets of sub-carriers (RU) to
different stations, increasing spectral efficiency and reducing latency.
Question 3: The free-space path loss (in dB) increases by how many decibels when the distance
between transmitter and receiver is doubled at 2.4 GHz?
A) 3 dB
B) 6 dB
C) 9 dB
D) 12 dB
Correct Answer: B) 6 dB
Explanation: FSPL = 20 log₁₀(d) + 20 log₁₀(f) + 32.45; doubling distance adds 20 log₁₀(2) ≈ 6 dB
regardless of frequency.
Question 4: Which 3GPP release introduced standalone (SA) 5G with its own 5G core network?
A) Release 15
B) Release 16
Telecommunications & Wireless Guide | 100%
Verified Q&A | Grade A
Question 1: Which ITU-R-defined band is most commonly used for modern 5G cellular
telecommunication below 6 GHz?
A) L-band
B) S-band
C) C-band
D) Ku-band
Correct Answer: C) C-band
Explanation: The 3.3–4.2 GHz portion of C-band has been globally allocated for 5G NR; it offers
the best compromise of coverage and bandwidth for macro-cell deployment.
Question 2: In a Wi-Fi 6 (802.11ax) BSS, the mechanism that divides the channel into smaller
sub-channels for simultaneous multi-user transmission is called:
A) MU-MIMO
B) OFDMA
, C) TDMA
D) DSSS
Correct Answer: B) OFDMA
Explanation: Orthogonal Frequency-Division Multiple Access allocates sets of sub-carriers (RU) to
different stations, increasing spectral efficiency and reducing latency.
Question 3: The free-space path loss (in dB) increases by how many decibels when the distance
between transmitter and receiver is doubled at 2.4 GHz?
A) 3 dB
B) 6 dB
C) 9 dB
D) 12 dB
Correct Answer: B) 6 dB
Explanation: FSPL = 20 log₁₀(d) + 20 log₁₀(f) + 32.45; doubling distance adds 20 log₁₀(2) ≈ 6 dB
regardless of frequency.
Question 4: Which 3GPP release introduced standalone (SA) 5G with its own 5G core network?
A) Release 15
B) Release 16
