Agile Controller-Campus As RADIUS When the server performs authentication, how many ends need to be configured for authentication on the admission control device?

If you are deploying BYOD When the system is installed, use a stand-alone installation SM, Dual-machine installation SC, Stand-alone hardware deployment AE,Which of the following descriptions are correct?
(Multiple choice)

The XMPP protocol has three roles: server, gateway and client. Corresponding to the free mobility solution, Agile Controller-Campus as the server, Huawei USG6000 firewall acts as the gateway, and the agile switch serves as the client.

After the enterprise network administrator deploys Agile Controller-Campus and SACG, the authentication succeeds but the authentication domain can't be accessed. This may be due to which reasons? (Multiple choices)

In Portal authentication, which of the following parameters must be configured on the switch? (Multiple choice)