In the process of deploying WAC on the cloud, the plug-and-play feature of WAC (PnP) can be used to simplify the initial configuration and enable the WAC device to go online quickly. Which of the…

In the process of deploying WAC on the cloud, the plug-and-play feature of WAC (PnP) can be used to simplify the initial configuration and enable the WAC device to go online quickly. Which of the following protocols does the WAC use to negotiate with the upstream device (which can be a cloud switch or cloud firewall) to obtain the PnP VLAN as the management VLAN?