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Exam CWNA-108 topic 1 question 31 discussion

Actual exam question from CWNP's CWNA-108
Question #: 31
Topic #: 1
[All CWNA-108 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?

  • A. 30 W
  • B. 12.95 W
  • C. 25.5 W
  • D. 15.4 W
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Suggested Answer: C 🗳️


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4 months ago
C - 25.5 W Class 4 can only be used by IEEE 802.3at (Type 2) devices, requiring valid Class 2 and Mark 2 currents for the power up stages. An 802.3af device presenting a class 4 current is considered non-compliant and, instead, will be treated as a Class 0 device. https://www.flukenetworks.com/blog/cabling-chronicles/type-3-and-type-4-are-here
upvoted 2 times
5 months, 3 weeks ago
Answer is B 802.11ac APs is to provide power using 802.3at (sometimes called “PoE plus”), a newer power standard that provides up to 25.5 watts at the end of a full-length Ethernet cable
upvoted 2 times
4 months ago
If 25.5 is the right answer, that would be C, not B. Class 4 PD is 25.5 Watts.
upvoted 1 times
6 months, 3 weeks ago
https://en.wikipedia.org/wiki/Power_over_Ethernet#Powering_devices WHen it says Recieved PD (Powered Device) is assimed. the table in the Wiki calls this initial Wattage out. 30W is negotiated MAX (one would think).
upvoted 1 times
Community vote distribution
A (35%)
C (25%)
B (20%)
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