A customer has implemented several WLANs in an auditorium utilizing a newly dedicated WLC and is experiencing excessive channel utilization regardless of occupancy. Which action reduces channel…

MCS 0-11 are high-throughput 802.11n rates that use efficient OFDM modulation; disabling them removes faster options and forces traffic to lower rates, which would increase, not decrease, channel utilization.

MCS rates associated with 40 MHz channels are efficient 802.11n/ac rates, and disabling them reduces available bandwidth without targeting the root cause of high utilization from legacy CCK transmissions.

CCK (Complementary Code Keying) modulation is used exclusively by 802.11b rates of 1, 2, 5.5, and 11 Mbps. These low rates consume proportionally more airtime per frame compared to OFDM rates, and management frames such as beacons are sent at the lowest enabled basic rate. Disabling CCK rates eliminates 802.11b support, forces all client and management traffic to use OFDM, and raises the minimum beacon rate, each of which directly reduces per-frame airtime consumption and lowers total channel utilization without removing any SSID.

VHT (Very High Throughput) rates are 802.11ac rates that deliver the most efficient airtime usage; disabling them forces capable clients to slower rates and increases channel utilization.