A university lecture hall has a Cisco wireless high-density network with this configuration:

• 5 GHz only

• 20-MHz channels

• UNII-1, UNII-2, and UNII2-E channels

• TPC minimum = 8

• TPC maximum = 14

The lecture hall is 200 feet by 100 feet and has 16 Cisco APs that use directional antennas. Which feature must be included in the design to mitigate and reduce high-channel utilization from rogue APs?