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Question 90 - CWNA-109 discussion

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You have implemented an 802.11ax WLAN for a customer. All APs are four stream HE APs. The customer states that it is essential that most of the clients can use the OFDMA modulation scheme. What do you tell the customer?

A.
The clients that must support OFDMA must also be upgraded to 802.11ax
Answers
A.
The clients that must support OFDMA must also be upgraded to 802.11ax
B.
OFDMA is an optional feature of 802.11ax and most APs don't even support it
Answers
B.
OFDMA is an optional feature of 802.11ax and most APs don't even support it
C.
All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
Answers
C.
All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
D.
If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
Answers
D.
If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
Suggested answer: A

Explanation:

OFDMA is a new modulation scheme introduced in 802.11ax that allows multiple users to share the same channel by dividing it into smaller subchannels called resource units (RUs). This improves the efficiency and capacity of the WLAN by reducing contention and overhead. However, to use OFDMA, both the AP and the client must support 802.11ax and negotiate the parameters of the subchannel allocation.Therefore, the customer needs to upgrade the clients that require OFDMA to 802.11ax devices12.

The other options are not correct because they do not reflect the reality of OFDMA.Option B is incorrect because OFDMA is a mandatory feature of 802.11ax for both downlink and uplink transmissions, and all 802.11ax APs must support it1. Option C is incorrect because OFDM and OFDMA are different modulation schemes, and OFDM does not allow multiple users to share the same channel.Option D is incorrect because 802.11ac devices cannot support OFDMA through driver upgrades, as they lack the hardware and firmware capabilities to do so2.

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asked 16/09/2024
Vyas Dookhun
31 questions
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