A.If the VPN server is configured for Xauth， the VPN client waits for a username / password challenge.
B.The Cisco Easy VPN feature only supports transform sets that provide authentication and encryption.
C.The VPN client initiates aggressive mode （AM） if a pre-shared key is used for authentication during the IKE phase 1 process.
D.The VPN client verifies a server username/password challenge by using a AAA authentication server that supports TACACS+ or RADIUS.
E.The VPN server can only be enabled on Cisco PIX Firewalls and Cisco VPN 3000 series concentrators.
F.When connecting with a VPN client，the VPN server must be configured for ISAKMP group 1，2 or 5.

A.The LIST1 list will disable authentication on the console port.
B.Because no method list is specified， the LIST1 list will not authenticate anyone on the console port.
C.All login requests will be authenticated using the group tacacs+ method.
D.All login requests will be authenticated using the local database method.
E.The default login authentication will automatically be applied to all login connections.