You are working as a network technician at Fatskills .com. In an attempt to secure Fatskills 's wireless network you use a wireless sniffer around the company perimeters. You discover that several of the company's Wireless Access Points (WAPs) are transmitting radio signals beyond the physical boundaries of Fatskills 's main office. You also discover that available bandwidth is suffering due to unauthorized wireless users. You start securing the network by turning down the power on the WAPs. Which of the following alternatives could you also implement in order to make it harder for unauthorized users to use bandwidth?