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CWNP Exam CWNA-109 Topic 5 Question 10 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 10
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 Alise at Aug 08, 2024, 03:36 PM

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Selene
10 months ago
B) OFDMA is optional? That's like saying 'breathing is optional' for my client. They're going to love that answer!
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Jess
10 months ago
D) Driver upgrades for 802.11ac devices? Ah, the good old 'have you tried turning it off and on again?' approach. That'll definitely solve all their problems.
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Monroe
10 months ago
C) All 5 GHz PHYs use OFDM? Well, that's a relief! I guess my client can just sprinkle some OFDMA fairy dust on their devices and call it a day.
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Mable
9 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Sabra
9 months ago
C) All 5 GHz PHYs use OFDM? Well, that's a relief! I guess my client can just sprinkle some OFDMA fairy dust on their devices and call it a day.
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Louann
10 months ago
B) OFDMA is optional? Wow, that's a real game-changer. I'll just tell my client to buy magical APs that can defy the laws of physics.
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Dustin
9 months ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Laura
9 months ago
C) All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
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Ellsworth
10 months ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Naomi
10 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Nana
10 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax? Seriously, does my client look like they have money growing on trees?
upvoted 0 times
Daniel
10 months ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Darrin
10 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
upvoted 0 times
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Mickie
11 months ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
upvoted 0 times
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Brinda
11 months ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
upvoted 0 times
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Hildegarde
11 months ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
upvoted 0 times
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