What is a recommended approach to avoid co-channel congestion while installing access points that use...

To avoid co-channel congestion in the 2.4-GHz band, adjacent access points should use different nonoverlapping channels. In many regulatory domains, the standard 2.4-GHz nonoverlapping channel plan is 1, 6, and 11. Using overlapping channels causes adjacent-channel interference, while using the same channel nearby creates co-channel contention where devices must wait longer to transmit. A single nonoverlapping channel across multiple adjacent APs is still a contention problem. Cisco CCNA 200-301 v1.1 Network Fundamentals includes wireless principles such as RF bands, channels, overlap, and basic design. The goal is not simply to maximize signal strength; it is to provide coverage while minimizing contention and interference. In practice, engineers plan cell size, transmit power, and channel reuse together. For this question, the recommended approach is different nonoverlapping channels. The correct answer is A.