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CWNP Exam CWNA-109 Topic 2 Question 20 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 20
Topic #: 2
[All CWNA-109 Questions]

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?

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Suggested Answer: A

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.


by Donte at Dec 10, 2024, 06:18 AM

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Floyd
6 days ago
Actually, OFDMA is an optional feature of 802.11ax, so most APs may not even support it.
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Goldie
7 days ago
I believe the clients that need OFDMA must be upgraded to 802.11ax.
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Sharika
10 days ago
I think it's important for most clients to be able to use OFDMA.
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Tommy
18 days ago
What do you think about the customer's request for OFDMA?
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