CWNP CWNA-109 Exam - Topic 1 Question 34 Discussion

Actual exam question for CWNP's CWNA-109 exam

Question #: 34
Topic #: 1

What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?

AIncreasing or decreasing the number of spatial streams in use by the client station and AP

BImplementing Fast BSS Transition (FT) for roaming

CImplementation of several other clients in the same BSS using 802.11g radios

DRF interference from more than 10 nearby Bluetooth transmitters

Show Suggested Answer

Suggested Answer: B

Implementing Fast BSS Transition (FT) for roaming is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS. FT is a feature that allows a client station to quickly switch from one AP to another within the same ESS (Extended Service Set) without having to re-authenticate and re-associate with each AP. This reduces the latency and packet loss that may occur during roaming, thus improving the user experience and maintaining the application layer throughput. FT is defined in the IEEE 802.11r amendment and is also known as Fast Roaming or Fast Secure Roaming.Reference:, Chapter 9, page 367; , Section 6.3

by Jesus at Nov 25, 2025, 10:20 PM

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Salena

10 hours ago

BSS with 802.11g clients won't slow down 802.11n that much.

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Sanjuana

6 days ago

Wait, I didn't know Bluetooth could interfere that much!

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Glenn

11 days ago

I disagree, D could really mess things up with all that interference.

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Carlene

16 days ago

C) 802.11g clients in the same BSS will definitely slow things down.

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Nichelle

21 days ago

Haha, Bluetooth? More like Bluebite my throughput!

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Youlanda

26 days ago

D) RF interference from Bluetooth is the least likely to impact throughput.

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Lon

1 month ago

I think RF interference is a big deal, especially with Bluetooth devices, so I wonder if D could actually be the least impactful factor here.

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Krissy

1 month ago

I feel like the presence of 802.11g clients could slow things down, but I can't recall if it would be less impactful than RF interference.

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Rozella

1 month ago

I’m not entirely sure, but I think Fast BSS Transition is more about reducing latency than throughput, so maybe B is the least impactful?

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Lyndia

2 months ago

I remember studying how spatial streams can significantly affect throughput, so I think A might have a bigger impact than we expect.

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Naomi

2 months ago

Okay, let me think this through. I'm going to go with B. Implementing FT for roaming shouldn't directly impact the application layer throughput as much as the other options.

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Alease

2 months ago

Definitely not D. RF interference from Bluetooth transmitters is going to have a significant impact on the 802.11n client's throughput, so that's the most likely answer.

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Grover

2 months ago

C is probably the least impactful since 802.11g is slower.

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Marci

2 months ago

I think C is the least impactful. 802.11g is slower anyway.

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Glennis

2 months ago

A) Increasing or decreasing the number of spatial streams is the most likely to impact throughput.

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Allene

3 months ago

Affects throughput, but not as much as you think.

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Pamella

3 months ago

I'm a bit confused on this one. I'm thinking it might be A, since adjusting the number of spatial streams could potentially optimize the throughput for the 802.11n client.

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Dino

3 months ago

Hmm, I'm not too sure about this one. I'm leaning towards C, since 802.11g clients in the same BSS could potentially cause more interference and reduce throughput for the 802.11n client.

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Malinda

3 months ago

I think the answer is B. Implementing Fast BSS Transition (FT) for roaming shouldn't have much impact on the application layer throughput since it's more about the roaming process.

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