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CWNP Exam CWAP-404 Topic 1 Question 12 Discussion

Actual exam question for CWNP's CWAP-404 exam
Question #: 12
Topic #: 1
[All CWAP-404 Questions]

When performing protocol analysis, you notice a high number of RTS/CTS frames being transmitted on an HT network. You suspect this may be due to HT protection mechanisms. Where in the Beacon frame would you look to determine which one of the four HT protection modes the AP is operating in?

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Suggested Answer: D

A VoIP phone, using WMM Power Save, requests data frames buffered at the AP by transmitting a trigger frame, which is a QoS Null frame or a QoS Data frame. WMM Power Save is a power saving mode that allows a STA (station) to conserve battery power by periodically sleeping and waking up. WMM Power Save is based on WMM (Wi-Fi Multimedia), which is a QoS (Quality of Service) enhancement that provides prioritized and differentiated access to the medium for different types of traffic. When a STA sleeps, it cannot receive any data frames from the AP, so it informs the AP of its power save status by setting a bit in its MAC header. The AP then buffers any data frames destined for the sleeping STA until it wakes up. When a STA wakes up, it sends a trigger frame to the AP, indicating its AC (Access Category), which is a logical queue that corresponds to its QoS level. A trigger frame can be either a QoS Null frame or a QoS Data frame, depending on whether it has any payload or not. The AP then responds with one or more data frames from the same AC as the trigger frame, followed by an ACK or BA (Block Acknowledgement) frame from the STA. The other options are not correct, as they are not used by a VoIP phone using WMM Power Save to request data frames buffered at the AP. A PS-Poll (Power Save Poll) frame is used by a STA using legacy power save mode, not WMM Power Save mode, to request data frames buffered at the AP. A PS-Poll frame does not indicate any AC or QoS information. Setting the More Data bit in the MAC header to 1 does not request any data frames from the AP, but indicates that there are more data frames to be sent by the STA or received by the STA. Transmitting a WMM Action frame does not request any data frames from the AP, but performs various management actions related to WMM features, such as admission control, parameter update, etc.Reference:[Wireless Analysis Professional Study Guide CWAP-404], Chapter 7: QoS Analysis, page 198-199


Contribute your Thoughts:

Theola
1 months ago
Ah, the old 'RTS/CTS dance' on an HT network. I bet the AP is trying to keep up with the latest dance craze. Maybe it's time to introduce the 'HT Protection Shuffle' to the party!
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Fabiola
14 hours ago
B) HT Information Element
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Val
1 days ago
A) HT Protection Element
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Katy
1 months ago
C'mon, it's gotta be the HT Operation Element. I mean, that's where the AP tells us all about its HT settings, right? No need to go hunting elsewhere.
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Phillip
1 months ago
Hold up, isn't this the kind of question that makes you feel like you're playing a game of 'Where's Waldo' with the Beacon frame? I'm going with C, the HT Operation Element.
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Alberta
14 hours ago
I believe it's B) HT Information Element.
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Ryann
10 days ago
I think it's A) HT Protection Element.
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Barabara
1 months ago
Wait, isn't the HT Information Element where the AP's HT capabilities are defined? That's where I'd start my search.
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Callie
10 hours ago
Zona: Yes, that's a good idea. Let's check both elements to get a better understanding.
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Zona
2 days ago
User 2: Should we also check the HT Protection Element to see which protection mode the AP is using?
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Van
12 days ago
User 1: I think you're right, the HT Information Element is where the AP's capabilities are defined.
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Lisbeth
2 months ago
I agree with Herminia, C) HT Operation Element makes more sense as it provides information about the protection mode.
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Nicholle
2 months ago
Hmm, I think the HT Operation Element is the place to look for the HT protection mode. Gotta keep those RTS/CTS frames under control, am I right?
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Tamekia
1 months ago
User 4: Definitely, keeping an eye on the HT Operation Element is key to optimizing network performance.
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Rosita
1 months ago
User 3: So important to manage those RTS/CTS frames efficiently on an HT network.
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Sueann
2 months ago
User 2: Yeah, that's where the AP specifies which protection mode it's using.
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Audria
2 months ago
User 1: I agree, the HT Operation Element is where we can find the HT protection mode.
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Herminia
2 months ago
I disagree, I believe it's C) HT Operation Element because it specifies the HT protection mode.
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Carline
3 months ago
I think the answer is A) HT Protection Element.
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