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CWNP CWNA-109 Exam - Topic 4 Question 44 Discussion

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
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
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades

CWNP CWNA-109 Exam - Topic 4 Question 44 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 44
Topic #: 4
[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?

Show Suggested Answer Hide Answer
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 Rodolfo at Jun 30, 2026, 10:10 AM

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Anglea
2 days ago
But what about D? If they have 802.11ac, can't they just upgrade?
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Narcisa
7 days ago
I agree, A makes sense. No OFDMA without 802.11ax support.
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Annice
13 days ago
I think A is the best choice. Clients need to be 802.11ax to use OFDMA.
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Rebbecca
18 days ago
B is a good point. Many clients might not support it even if APs do.
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Edward
23 days ago
I agree with A. Upgrading clients is crucial for OFDMA benefits.
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Michell
28 days ago
D seems plausible, but not all 802.11ac devices can be upgraded easily.
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Barney
1 month ago
C sounds too optimistic. Not all devices will achieve OFDMA everywhere.
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Keshia
1 month ago
I feel like B is misleading. OFDMA is optional, but many APs do support it.
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Helga
1 month ago
I think A is correct. Clients need to be 802.11ax to use OFDMA.
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Thurman
2 months ago
D) Driver upgrades for 802.11ac? Sounds too good to be true!
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Margurite
2 months ago
Wait, I thought all 5 GHz used OFDM? Is that true?
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Roxane
2 months ago
B) Actually, OFDMA is optional, not all APs support it.
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Darrin
2 months ago
Totally agree, OFDMA is a must for efficiency!
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Rodney
2 months ago
A) Clients need to be 802.11ax to use OFDMA.
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Felix
2 months ago
I thought all 5 GHz devices used OFDM, but does that mean OFDMA is guaranteed everywhere? I feel like I need to double-check that.
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Jonell
3 months ago
I’m pretty sure that if a client is on 802.11ac, it won’t support OFDMA unless it’s upgraded. But I can’t recall if that’s through drivers or hardware.
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Alex
3 months ago
I think I saw a practice question that mentioned OFDMA being optional for some devices. So, I wonder if that applies here too.
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Dyan
3 months ago
I remember that OFDMA is indeed a key feature of 802.11ax, but I'm not sure if all clients need to be 802.11ax to use it.
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