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CWNP CWNA-109 Exam - Topic 1 Question 39 Discussion

Actual exam question for CWNP's CWNA-109 exam
Question #: 39
Topic #: 1
[All CWNA-109 Questions]

A dual-band 802.11ac AP must be powered by PoE. As a class 4 device, what power level should be received at the AP?

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Suggested Answer: C

PoE has different standards that define different power levels for PSEs and PDs. The original standard, IEEE 802.3af, defines two classes of PSEs: Class 3 (15.4 W) and Class 4 (30 W). The newer standard, IEEE 802.3at, also known as PoE+, defines four classes of PSEs: Class 0 (15.4 W), Class 1 (4 W), Class 2 (7 W), and Class 3 (12.95 W). The power level received at the PD is always lower than the power level provided by the PSE, due to cable resistance and power dissipation. The IEEE standards specify the minimum power level that must be received at the PD for each class of PSE.For a Class 4 PSE, the minimum power level received at the PD is 25.5 W910.Reference:CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 295;CWNA-109 Study Guide, Chapter 7: Power over Ethernet (PoE), page 289.


by Shalon at Apr 08, 2026, 12:41 AM

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Annette
18 days ago
Definitely 25.5 W, that’s the right power level.
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Rene
23 days ago
It should be 30 W for class 4.
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Jade
1 month ago
I believe it’s 30 W, but I might be mixing it up with another class. I need to double-check!
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Brandon
1 month ago
I’m a bit confused; I thought class 4 was 15.4 W, but that seems too low for a dual-band AP.
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Raylene
2 months ago
I remember practicing a similar question, and I think the answer was 25.5 W for class 4 devices.
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Karan
2 months ago
I think a class 4 device like this AP should receive around 30 W, but I'm not entirely sure.
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