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?
In this design, there are 12 access points, each with a 5 GHz radio. Since each radio operates on a different channel to avoid interference, each access point represents a separate collision domain. Therefore, with 12 access points, there will be 12 collision domains.
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
C is correct for 20MHz channels
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
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
D - we can have total 25 channels ...The channel entity is an 802.11 collision domain