John a network administrator at Northeast High School.

John a network administrator at Northeast High School. Faculty have been complaining that although they can detect and authenticate to the faculty wireless network, they are unable to connect. While troubleshooting, John discovers that the wireless network server is out of DHCP addresses due to a large number of unauthorized student devices connecting to the network. Which course of action would be an effective temporary stopgap to secure the network until a permanent solution can be found?