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Question 23 - CWAP-404 discussion

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What is the function of the PHY layer?

A.
Convert PPDUs to PSDUs for transmissions and PSDUs to PPDUs for receptions
Answers
A.
Convert PPDUs to PSDUs for transmissions and PSDUs to PPDUs for receptions
B.
Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs for receptions
Answers
B.
Convert MSDUs to PPDUs for transmissions and PPDUs to MSDUs for receptions
C.
Convert PPDUs to MSDUs for transmissions and MSDUs to PPDUs for receptions
Answers
C.
Convert PPDUs to MSDUs for transmissions and MSDUs to PPDUs for receptions
D.
Convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions
Answers
D.
Convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions
Suggested answer: D

Explanation:

The function of the PHY layer is to convert PSDUs to PPDUs for transmissions and PPDUs to PSDUs for receptions. A PSDU (PHY Service Data Unit) is the data unit that is passed from the MAC layer to the PHY layer for transmission, or from the PHY layer to the MAC layer for reception. A PPDU (PHY Protocol Data Unit) is the data unit that is transmitted or received over the wireless medium by the PHY layer. A PPDU consists of a PSDU and a PHY header, which contains information such as modulation, coding, and data rate. The PHY layer adds or removes the PHY header to or from the PSDU during the conversion process.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 4: 802.11 Physical Layer, page 97-98

asked 16/09/2024
Duncan Brundseaux
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