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CWNP CWNA-109 Exam - Topic 2 Question 20 Discussion

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?
A) 802.11 DOS prevention
B) OFDMA
C) CSMA/CD
D) CSMA/CA

CWNP CWNA-109 Exam - 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?

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 Donte at Dec 10, 2024, 06:18 AM

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Celeste
7 months ago
Nope, it's all about CSMA/CA in wireless.
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Queenie
8 months ago
I thought OFDMA was supposed to help with that too?
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Chantell
8 months ago
Wait, isn't CSMA/CD more relevant for wired networks?
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Martha
8 months ago
Totally agree, CSMA/CA is key for fair access!
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Willard
8 months ago
It's definitely CSMA/CA that manages the airtime.
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Noel
9 months ago
I feel like I might be mixing things up, but CSMA/CD is for wired networks, right? So it can't be that one.
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Ashleigh
9 months ago
I practiced a question similar to this, and I recall that CSMA/CA is used to manage access to the medium, so that could be the answer.
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Allene
9 months ago
I’m not entirely sure, but I remember something about OFDMA being more relevant to newer standards, not 802.11n specifically.
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Cassie
9 months ago
I think it might be CSMA/CA since it deals with how stations avoid collisions in wireless networks.
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Aliza
9 months ago
CSMA/CA is the access method used in 802.11 networks to avoid collisions, so that's my best guess for the answer.
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Jimmie
9 months ago
I'm a little confused by the wording of the question. Let me re-read it and see if I can figure it out.
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Laurena
9 months ago
CSMA/CA makes sense to me as the mechanism that prevents stations from using all the airtime.
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Tasia
9 months ago
Hmm, I'm a bit unsure about this one. I'll need to think it through carefully.
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Margurite
9 months ago
This question seems straightforward, I think CSMA/CA is the correct answer.
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Raina
1 year ago
D) CSMA/CA is the way to go. It's the tried and true method for keeping all those stations from hogging the airtime. Though, I wonder if they have a special 'no cheating' mode for exam questions like this.
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Ronny
1 year ago
D) CSMA/CA is the way to go. It's the tried and true method for keeping all those stations from hogging the airtime. Though, I wonder if they have a special 'no cheating' mode for exam questions like this.
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Eugene
1 year ago
C) CSMA/CD
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Alaine
1 year ago
B) OFDMA
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Justine
1 year ago
A) 802.11 DOS prevention
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Lina
1 year ago
D) CSMA/CA is the way to go. It's the tried and true method for keeping all those stations from hogging the airtime.
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Krissy
1 year ago
C) CSMA/CD
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Gregg
1 year ago
B) OFDMA
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Lillian
1 year ago
A) 802.11 DOS prevention
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Virgie
1 year ago
A) 802.11 DOS prevention? That's not even a real thing! These answer choices are getting more and more ridiculous.
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Ming
1 year 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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Ula
1 year ago
C) CSMA/CD
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Nickolas
1 year 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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Christoper
1 year ago
D) CSMA/CA
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Elin
1 year ago
A) 802.11 DOS prevention
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Jordan
1 year 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
1 year 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
1 year ago
I agree with Rene. CSMA/CA helps prevent stations from using all the airtime.
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Rene
1 year ago
I think the answer is D) CSMA/CA.
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