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Exam CWNA-107 topic 1 question 13 discussion

Actual exam question from CWNP's CWNA-107
Question #: 13
Topic #: 1
[All CWNA-107 Questions]

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?

  • A. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
  • B. OFDM was first introduced in 802.11 and is used by the ERP, HT and VHT PHYs as well.
  • C. OFDM implement BPSK modulation to allow for data rates up to 7 Gbps.
  • D. OFDM modulation is used only in 5 GHz 802.11 transmissions.
Show Suggested Answer Hide Answer
Suggested Answer: D 🗳️
Reference -
http://www.rhyshaden.com/802_11a.htm
by boy_with_nikon at Dec. 11, 2019, 12:22 a.m.

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AlmoomlA
Highly Voted 3 years, 11 months ago
OFDM is only used in 5Ghz transmissions. 802.11g ERP-OFDM, and 802.11n HT-OFDM are used in 2.4Ghz transmissions and are not specifically OFDM.
upvoted 5 times
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Lastemist
Most Recent 3 years, 9 months ago
Correct is B. ERP The Extended Rate PHY (ERP) was introduced to bring the OFDM modulation down into the 2.4 GHz band. The implemented PHY features in 802.11 devices use the same OFDM modulation used in 802.11a 5 GHz devices and use 20 MHz channels.
upvoted 2 times
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Anilr
4 years, 7 months ago
ERP and HT both uses OFDM in 2.4Ghz . OFDM was introduced in 802.11a . Nearest correct answer is B.
upvoted 2 times
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boy_with_nikon
4 years, 11 months ago
Should be B. Because, n uses OFDM and n operates in both 5 and 2.4 GHz
upvoted 2 times
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