After designing and deploying a WLAN infrastructure, you notice that co-channel interference (CCI) is causing...

In the 2.4 GHz band, there are only three non-overlapping channels (1, 6, 11). Overuse of radios on the same or overlapping channels results in excessive co-channel interference (CCI), leading to contention and degraded throughput. The CWDP-305 Study Guide advises minimizing the number of active radios in the 2.4 GHz band in dense environments.

Turning off 2.4 GHz radios on some APs is the recommended action to reduce CCI without introducing adjacent-channel interference (ACI), which would occur if you used overlapping channels like 3, 4, or 8. This adjustment retains channel reuse efficiency and supports low-density legacy devices. It’s especially relevant in designs that primarily target 5 GHz or 6 GHz but include 2.4 GHz for backward compatibility.