User authentication is the authentication of the client's identity by the SSL virtual gateway, including: ________, server authentication, certificate anonymous authentication and certificate challenge authentication.

When using the passive mode to establish an FTP connection, use port 20 for the control channel and port 21 for the data channel.

Which configuration below can implement NAT ALG function?

In the process of establishing IPSec VPN between the peers FW_A and FW_B, two types of security associations need to be established in two stages. In the first stage, establish ____ to verify the identity of the peers.

Regarding the windows log, which of the following descriptions is wrong?