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Question 32 - CWNA-109 discussion

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Which IEEE 802.11 physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS?

A.
DSSS (802.11-Prime)
Answers
A.
DSSS (802.11-Prime)
B.
OFDM (802.11a)
Answers
B.
OFDM (802.11a)
C.
HT (802.11n)
Answers
C.
HT (802.11n)
D.
VHT (802.11ac)
Answers
D.
VHT (802.11ac)
Suggested answer: C

Explanation:

The HT (802.11n) physical layer (PHY) specification includes support for and compatibility with both ERP and HR/DSSS. ERP stands for Extended Rate PHY, which is an extension of the original DSSS (Direct Sequence Spread Spectrum) PHY that supports data rates up to 54 Mbps in the 2.4 GHz band. HR/DSSS stands for High Rate/Direct Sequence Spread Spectrum, which is another extension of DSSS that supports data rates up to 11 Mbps in the 2.4 GHz band. HT stands for High Throughput, which is a new PHY that supports data rates up to 600 Mbps in both the 2.4 GHz and 5 GHz bands. HT uses OFDM (Orthogonal Frequency Division Multiplexing) as its modulation scheme, but it also supports legacy DSSS and ERP devices by using a dual preamble and header structure that allows backward compatibility.Reference:, Chapter 3, page 103; , Section 3.1

asked 16/09/2024
Gilbert Ciepluch
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