You are attempting to locate the cause of a performance problem in two WLAN cells in a mostly overlapping coverage area. You note that one AP is on channel 1 and the other is on channel 2. When you document your findings, what term do you use to describe the problem in this configuration?
The issue described involves two Access Points (APs) that are on adjacent channels (channel 1 and channel 2) in overlapping coverage areas. This situation causes Adjacent Channel Interference (ACI) because the channels are close but not the same, leading to overlap in the frequency space which can result in corrupted data and layer 2 retransmissions. Therefore, the correct term to describe this problem is Adjacent Channel Interference (ACI).
D.Adjacent channel interference is more serious and occurs when 2 or more AP's are on overlapping channels, for example channel 1 + 4 on the 2.4Ghz band. ACI creates overlap in the frequency space causing corrupted data and layer 2 re-transmissions.
Answer is D
ACI=Adjacent channel interference. Term that is not being use in the book.