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CWNP CWNA-109 Exam - 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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Lenna
3 months ago
Can you really upgrade 802.11ac devices for OFDMA? Sounds sketchy.
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Armanda
3 months ago
Most APs do support OFDMA, it's not that rare.
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Billye
3 months ago
Wait, I thought OFDMA was mandatory for all 802.11ax devices?
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Adelina
4 months ago
Totally agree, no OFDMA without 802.11ax support!
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Salome
4 months ago
Clients need to be 802.11ax to use OFDMA.
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Sherly
4 months ago
I vaguely remember that devices need to be 802.11ax to fully utilize OFDMA, but I’m not sure if driver updates can help older devices.
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Marjory
4 months ago
I feel like I practiced a question about how OFDMA works with 5 GHz, but I'm not clear if it applies to all devices or just the newer ones.
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Tomoko
4 months ago
I think I read somewhere that OFDMA is optional in 802.11ax, but I can't recall if that means most clients can use it or not.
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Pearly
5 months ago
I remember that OFDMA is 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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Stephanie
5 months ago
I'm pretty confident on this one. The client devices will need to be upgraded to 802.11ax in order to support OFDMA, since it's an optional feature.
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Belen
5 months ago
Wait, I'm a bit confused. Doesn't OFDM work on all 5 GHz PHYs? I'm not sure if that's the same as OFDMA.
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Naomi
5 months ago
Okay, I think I've got this. The key is that OFDMA is an optional feature of 802.11ax, so the clients will need to support 802.11ax to use it.
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Lasandra
5 months ago
Hmm, this is a tricky one. I'll need to think carefully about the 802.11ax capabilities and how OFDMA works.
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Brunilda
5 months ago
This seems like a straightforward question about improving telephone communication skills. I'll focus on reading the options carefully and choosing the one that seems most relevant.
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Judy
5 months ago
Hmm, the part about apps containing mobile pages being usable only after release is interesting. I'll need to think through the implications of that.
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Ernestine
5 months ago
Based on what I reviewed, I think the dividend payout ratio using the residual model will definitely be below 60%, but I can't quite recall the exact calculations needed.
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Selene
1 year 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
1 year 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
1 year 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
1 year ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Sabra
1 year 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
2 years 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
1 year ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Laura
1 year ago
C) All 5 GHz PHYs use OFDM modulation, so you will achieve OFDMA everywhere in 5 GHz
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Ellsworth
1 year ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Naomi
2 years ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Nana
2 years 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?
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Daniel
2 years ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Darrin
2 years ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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Mickie
2 years ago
B) OFDMA is an optional feature of 802.11ax and most APs don't even support it
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Brinda
2 years ago
D) If the devices support 802.11ac, they can be updated to support OFDMA through driver upgrades
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Hildegarde
2 years ago
A) The clients that must support OFDMA must also be upgraded to 802.11ax
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