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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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Linette
1 months ago
D sounds nice, but I don't think driver upgrades can magically add OFDMA support to 802.11ac devices. Gotta go with A again.
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Silva
2 months ago
Hmm, I'm not sure C is correct. OFDM and OFDMA are different things, even if they're both using OFDM as the underlying tech.
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Mari
10 days ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Heidy
24 days ago
Hmm, I'm not sure C is correct. OFDM and OFDMA are different things, even if they're both using OFDM as the underlying tech.
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Malissa
27 days ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Oretha
30 days ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Omega
2 months ago
I bet the customer is going to ask for OFDMA on their toasters next. Can't wait to see the look on their face when I tell them it's not possible.
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Alisha
2 months ago
Hey, I heard the 802.11ax standard is so advanced, it can even make coffee for you in the morning. Is that true?
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Starr
18 days ago
C) All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
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Linette
1 months ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Kattie
1 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Floyd
2 months ago
Actually, OFDMA is an optional feature of 802.11ax, so most APs may not even support it.
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Goldie
2 months ago
I believe the clients that need OFDMA must be upgraded to 802.11ax.
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Sharika
2 months ago
I think it's important for most clients to be able to use OFDMA.
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Tommy
3 months ago
What do you think about the customer's request for OFDMA?
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