300-365 · Question #179
Which impact of co-channel interference in WLANs is true?
The correct answer is A. reduced available spectrum and performance. Co-channel interference forces APs sharing the same channel to contend for the same medium, which reduces effective airtime and degrades overall WLAN throughput and performance.
Question
Which impact of co-channel interference in WLANs is true?
Options
- Areduced available spectrum and performance
- Breduced number of nonoverlapping channels
- Cincreased available spectrum and performance
- Dincreased number of nonoverlapping channels
How the community answered
(26 responses)- A88% (23)
- B4% (1)
- C8% (2)
Why each option
Co-channel interference forces APs sharing the same channel to contend for the same medium, which reduces effective airtime and degrades overall WLAN throughput and performance.
Co-channel interference causes APs on the same channel to detect each other's transmissions and defer transmission via CSMA/CA backoff, directly reducing the usable airtime and spectral efficiency available to each AP. This medium contention lowers available spectrum utilization and degrades client performance across all co-channel cells.
Co-channel interference does not reduce the number of non-overlapping channels - that count is a fixed characteristic of the frequency band and regulatory domain, not a function of interference conditions.
Co-channel interference decreases, not increases, available spectrum efficiency and performance because competing transmissions consume shared airtime through forced deferrals.
Co-channel interference does not change the number of non-overlapping channels available in a band - it is a deployment planning problem, not a channel availability problem.
Concept tested: Co-channel interference impact on WLAN spectrum and performance
Source: https://www.cisco.com/c/en/us/support/docs/wireless/aironet-1100-series/12106-wlan-channel.html
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