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CWNP Exam CWNA-109 Topic 5 Question 22 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 22
Topic #: 5
[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 Mindy at Jan 24, 2025, 03:28 AM

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Lakeesha
12 days ago
I like how option D tries to provide a workaround, but upgrading driver support for OFDMA on 802.11ac devices? That seems a bit far-fetched.
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Florinda
13 days ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Emilio
14 days ago
But what if the clients can't be upgraded?
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Florinda
20 days ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Berry
24 days ago
Haha, option C is a funny one. Using OFDM on 5 GHz and expecting OFDMA everywhere? Sounds like a stretch!
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Karl
5 days ago
Haha, option C is a funny one. Using OFDM on 5 GHz and expecting OFDMA everywhere? Sounds like a stretch!
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Breana
10 days ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Royal
27 days ago
I agree with Lakeesha. Option B seems more likely. OFDMA support is not a given, even if the APs are 802.11ax compliant.
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Lakeesha
28 days ago
Hmm, I'm not too sure about that. Isn't OFDMA an optional feature of 802.11ax? The cusLakeeshaer's devices might not even support it.
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Fannie
15 days ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Shawnta
18 days ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Glenn
1 months ago
Option A seems to be the correct answer here. OFDMA is a key feature of 802.11ax, and clients must support it to take advantage of the technology.
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Idella
22 hours ago
A) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Sherron
4 days ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Eve
5 days ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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