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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]

In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other client stations are actively communicating in the same BSS?

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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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Ming
2 days ago
B) OFDMA? Really? That's for 802.11ax, not 802.11n. Someone needs to go back and review their 802.11 standards!
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Jordan
3 days ago
D) CSMA/CA, of course! That's the classic medium access control mechanism for 802.11 networks. Gotta love that Carrier Sense Multiple Access with Collision Avoidance.
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Lakeesha
14 days ago
I'm not sure, but I think CSMA/CA is the right choice because it helps with channel access.
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Georgene
21 days ago
I agree with Rene. CSMA/CA helps prevent stations from using all the airtime.
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Rene
25 days ago
I think the answer is D) CSMA/CA.
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