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Question 24 - CWAP-404 discussion

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What is the function of the PHY Preamble?

A.
To terminate a conversation between transmitter and receiver
Answers
A.
To terminate a conversation between transmitter and receiver
B.
To set the modulation method for the MPDU
Answers
B.
To set the modulation method for the MPDU
C.
Carries the NDP used in Transmit Beamforming and MU-MIMO
Answers
C.
Carries the NDP used in Transmit Beamforming and MU-MIMO
D.
Allows the receiver to detect and synchronize with the signal
Answers
D.
Allows the receiver to detect and synchronize with the signal
Suggested answer: D

Explanation:

The function of the PHY preamble is to allow the receiver to detect and synchronize with the signal. The PHY preamble is a part of the PPDU that is transmitted before the PHY header and the PSDU. The PHY preamble consists of a series of training fields that help the receiver to adjust its parameters, such as frequency, timing, and gain, to match the incoming signal. The PHY preamble also helps the receiver to estimate the channel conditions and noise level.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 4: 802.11 Physical Layer, page 99-100

asked 16/09/2024
JAVIER MALDONADO
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