Regarding the description of the operating system, which of the following is wrong?

The single sign-on function of Internet users, the user directly authenticates to the AD server, the device does not interfere with the user authentication process, the AD monitoring service needs to be deployed in the USG device to monitor the authentication information of the AD server.

Regarding the actions of the security policy and the description of the security configuration file, which of the following options are correct? (Multiple choice)

When configuring a GRE Tunnel interface, which of the following parameters does the Destination address generally refer to?

IPSec VPNs use pre-shared keys, ( ) and digital envelopes to authenticate peers. (fill in the blank)