MENU
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?
Suggested Answer: B
Get Premium CWNA-109 Questions
as Interactive Web-Based Practice Test or PDF
Real Exam Format
Detailed Explanations
Instant Access
Get Your Practice Test
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
29 comments · newest first
VA
Vallie
6 months ago
I lean towards C too. Legacy clients won't slow down the n standard.
MA
Margarita
6 months ago
B is important for roaming, but not for throughput directly.
MI
Mike
7 months ago
I feel like A could also matter. More streams usually help.
MA
Marlon
7 months ago
D could be a big issue. Bluetooth interference is serious.
AL
Aleta
7 months ago
Agreed, C seems right. Other clients won't affect 802.11n much.
SA
Salena
8 months ago
BSS with 802.11g clients won't slow down 802.11n that much.
SA
Sanjuana
8 months ago
Wait, I didn't know Bluetooth could interfere that much!
GL
Glenn
8 months ago
I disagree, D could really mess things up with all that interference.
CA
Carlene
8 months ago
C) 802.11g clients in the same BSS will definitely slow things down.
NI
Nichelle
8 months ago
Haha, Bluetooth? More like Bluebite my throughput!
YO
Youlanda
8 months ago
D) RF interference from Bluetooth is the least likely to impact throughput.
LO
Lon
9 months 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.
KR
Krissy
9 months 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.
RO
Rozella
9 months 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?
LY
Lyndia
9 months ago
I remember studying how spatial streams can significantly affect throughput, so I think A might have a bigger impact than we expect.
NA
Naomi
9 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.
AL
Alease
10 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.
GR
Grover
10 months ago
C is probably the least impactful since 802.11g is slower.
MA
Marci
10 months ago
I think C is the least impactful. 802.11g is slower anyway.
GL
Glennis
10 months ago
A) Increasing or decreasing the number of spatial streams is the most likely to impact throughput.
AL
Allene
10 months ago
Affects throughput, but not as much as you think.
PA
Pamella
11 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.
DI
Dino
11 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.
MA
Malinda
11 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.
GE
Gertude
5 months ago
Agreed, B is likely the least impactful overall.
BR
Brittni
6 months ago
D seems like it would cause more issues than B.
SA
Sage
6 months ago
I think C could also be a minor factor. 802.11g isn’t as demanding.
CA
Carmen
6 months ago
True, but what about the impact of RF interference?
JA
Janessa
6 months ago
I see your point about FT. It’s mainly for seamless transitions.