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CWNP CWNA-109 Exam - Topic 6 Question 7 Discussion

Which IEEE 802.11 physical layer (PHY) specification includes support for operation in the 2.4 GHz, 5 GHz, and 6 GHz bands?
D) HE (802.11ax)
A) VHT (802.11ac).
B) HT(802.11n)
C) HR/DSSS (802.11b)

CWNP CWNA-109 Exam - Topic 6 Question 7 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 7
Topic #: 6
[All CWNA-109 Questions]

Which IEEE 802.11 physical layer (PHY) specification includes support for operation in the 2.4 GHz, 5 GHz, and 6 GHz bands?

Show Suggested Answer Hide Answer
Suggested Answer: D

The IEEE 802.11ax standard, also known as High-Efficiency Wireless (HEW) or simply HE, includes support for operation across multiple frequency bands: 2.4 GHz, 5 GHz, and, with the appropriate regulatory approvals, the 6 GHz band. This makes option D the correct answer. Here's how it compares to the other options:

HE (802.11ax): Introduced as an enhancement over previous standards, 802.11ax is designed to improve efficiency, especially in dense environments. It supports operation in the 2.4 GHz, 5 GHz, and 6 GHz bands (the latter pending regulatory approval in various regions), making it highly versatile and future-proof.

VHT (802.11ac): Very High Throughput, or 802.11ac, operates exclusively in the 5 GHz band. It introduced significant speed improvements over its predecessor (802.11n) but does not support the 2.4 GHz or 6 GHz bands.

HT (802.11n): High Throughput, or 802.11n, supports operation in both the 2.4 GHz and 5 GHz bands. However, it does not include support for the 6 GHz band.

HR/DSSS (802.11b): High-Rate Direct Sequence Spread Spectrum, or 802.11b, operates only in the 2.4 GHz band. It was one of the early Wi-Fi standards and does not support 5 GHz or 6 GHz bands.

Given these distinctions, only 802.11ax (option D) supports operation across all three mentioned bands, aligning with the requirements stated in the question.


IEEE 802.11ax-2021: High-Efficiency Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.

Understanding the 802.11ax (Wi-Fi 6) standard and its implications for modern wireless networking.

by Stephen at Jun 28, 2024, 08:44 PM

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Rosendo
8 months ago
802.11n only covers 2.4 and 5 GHz, just FYI!
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Marleen
8 months ago
Wait, does 802.11ax really work in all those bands? Sounds too good to be true.
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Glendora
8 months ago
I thought 802.11ac was the latest. Surprised to learn about 802.11ax!
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Cheryl
8 months ago
Agreed! 802.11ax is the way to go for modern networks.
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Desmond
9 months ago
It's definitely HE (802.11ax) that supports all three bands.
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Willard
9 months ago
I’m torn between B and D, but I think D is more recent and includes all three bands.
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Lina
9 months ago
I recall that 802.11n supports both 2.4 GHz and 5 GHz, but I don't think it covers 6 GHz.
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Rolf
9 months ago
I feel like I studied something about 802.11ac being limited to 5 GHz, so it can't be A.
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Kristine
9 months ago
I think the answer might be D, HE (802.11ax), but I'm not completely sure. I remember it covers multiple bands.
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Kizzy
9 months ago
I'm pretty sure the answer is D. HE (802.11ax) is the latest standard and it supports operation in all three frequency bands - 2.4 GHz, 5 GHz, and 6 GHz.
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Linwood
9 months ago
Okay, let me think this through step-by-step. 802.11b is 2.4 GHz only, 802.11n is 2.4 GHz and 5 GHz, and 802.11ac is 2.4 GHz, 5 GHz, and 6 GHz. So the answer has to be VHT (802.11ac).
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Oliva
9 months ago
Hmm, I'm a little unsure on this one. I know 802.11n supports 2.4 GHz and 5 GHz, but I can't remember if it includes 6 GHz. I'll have to think this through carefully.
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Kyoko
9 months ago
This one seems pretty straightforward. I'm pretty confident the answer is VHT (802.11ac) since that specification supports the 2.4 GHz, 5 GHz, and 6 GHz bands.
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Janna
10 months ago
Hmm, I'm a bit unsure about this one. I'll need to double-check the PEP 8 recommendations on docstrings and comments to make sure I pick the right answers.
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Stephane
10 months ago
This question seems pretty straightforward. The four levels of security are User Authentication, Document, Task, and Cell Level. I'm confident those are the correct choices.
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Carey
10 months ago
Hmm, I'm a bit unsure about this one. I think I need to use a stream or a lambda expression to filter the longlist, but I'm not 100% sure of the syntax.
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Felix
10 months ago
This looks like a straightforward OSPF configuration question. I'll need to carefully analyze the network topology and requirements to determine the correct option.
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Colby
10 months ago
I practiced a similar question where return traffic rules were definitely a key point. B might be correct, but I'm second guessing it now!
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Destiny
10 months ago
Okay, let's see. The question is asking about a document that informs others of received goods. I'm going to go with D - Packing slip.
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Valentine
2 years ago
Ah, the eternal battle of Wi-Fi specs. I'm just gonna throw a dart and hope for the best.
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Carole
2 years ago
6 GHz, huh? That's like, the new frontier of Wi-Fi. I bet the right answer is HE (802.11ax) - future-proof all the way!
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Val
2 years ago
Absolutely, with HE (802.11ax) you'll be ready for whatever comes next in wireless technology.
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Cruz
2 years ago
I agree, HE (802.11ax) is designed to handle the new frontier of Wi-Fi.
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Justa
2 years ago
Yeah, it's definitely the most advanced option for future-proofing your Wi-Fi.
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Arlene
2 years ago
I think you're right, HE (802.11ax) is the way to go for the 6 GHz band.
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Josphine
2 years ago
Looks like a trick question. They're all IEEE 802.11 PHY specs, but only one supports 6 GHz. Gotta be VHT (802.11ac).
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Selene
2 years ago
Actually, you're right. VHT (802.11ac) is the one that covers 2.4 GHz, 5 GHz, and 6 GHz bands.
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Art
2 years ago
No, I believe it's HE (802.11ax) that includes support for 6 GHz.
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Sabina
2 years ago
I think it's VHT (802.11ac) because it supports the 6 GHz band.
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Bonita
2 years ago
Actually, you're right. VHT (802.11ac) is the one that supports operation in the 2.4 GHz, 5 GHz, and 6 GHz bands.
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Broderick
2 years ago
No, I believe it's HE (802.11ax) that supports the 6 GHz band.
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Jessenia
2 years ago
I think it's VHT (802.11ac) because it supports 6 GHz.
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Mollie
2 years ago
I think the answer is D) HE (802.11ax) because it is the latest standard with support for 6 GHz band.
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Alise
2 years ago
Hmm, I'm torn between HT (802.11n) and HE (802.11ax). Maybe I should just ask Alexa for the answer.
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Laurel
2 years ago
D) HE (802.11ax)
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Verlene
2 years ago
A) VHT (802.11ac).
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Hubert
2 years ago
I'm not sure, but I think A) VHT (802.11ac) also supports multiple bands.
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Kanisha
2 years ago
Gotta go with HE (802.11ax) here, the latest and greatest!
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Lino
2 years ago
HR/DSSS (802.11b) may be older, but it's still reliable for certain applications.
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Joana
2 years ago
HT (802.11n) has been around for a while but still holds up in terms of performance.
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Gerry
2 years ago
I think VHT (802.11ac) is also a strong contender with its support for multiple bands.
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Malinda
2 years ago
I agree, HE (802.11ax) is definitely the way to go for the latest technology.
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Lorean
2 years ago
I agree with Catalina, HE (802.11ax) supports operation in multiple bands.
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Brittni
2 years ago
VHT (802.11ac) supports 2.4 GHz, 5 GHz, and 6 GHz, so that's my pick.
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Laura
2 years ago
I think VHT (802.11ac) is the one that covers all those bands.
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Glendora
2 years ago
I agree, VHT (802.11ac) is the correct answer for that.
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Catalina
2 years ago
I think the answer is D) HE (802.11ax).
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