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Exam HPE6-A47 topic 1 question 17 discussion

Actual exam question from HP's HPE6-A47

Question #: 17
Topic #: 1

[All HPE6-A47 Questions]

An architect plans 12 APs for an auditorium that is 325 square meters (3, 498 square feet). Each AP has one 2.4 GHz radio and one 5 GHz radio. Both types of radios use 20 MHz channels.
Assume that DFS channels can be used in this design. How many 5 GHz collision domains does this design provide?

A. 1
B. 6
C. 12
D. 25

Show Suggested Answer

Suggested Answer: B 🗳️

by toni2 at May 11, 2021, 2:44 p.m.

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NoNameFound

Highly Voted 2 years, 9 months ago

C - Yes 5Ghz has 25 channels / collision domains. But in this design we have 12 access points, so 12 channels in use in this design

upvoted 6 times

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Gentle_Taxes

Most Recent 1 year, 6 months ago

Seems like a trick question. Yes there are more than 12 nonoverlapping 20MHz channels in 5GHz spectrum. But with 12 AP's and 1 5GHz radio per AP = technically 12 collision domains at any given time

upvoted 3 times

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Johno

2 years, 4 months ago

I think C is correct - The term collision domain is used to describe a part of a network where packet collisions can occur. Packet collisions occur when two devices on a shared network segment send packets simultaneously. So with 12 APs then the chances are that there are 12 collision domains

upvoted 2 times

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Mrvn

2 years, 11 months ago

D - we can have total 25 channels ...The channel entity is an 802.11 collision domain

upvoted 1 times

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toni2