多选题Which three statements about the Cisco Easy VPN feature are true？（）AIf the VPN server is configured for Xauth， the VPN client waits for a username / password challenge.BThe Cisco Easy VPN feature only supports transform sets that provide authentication and encryption.CThe VPN client initiates aggressive mode （AM） if a pre-shared key is used for authentication during the IKE phase 1 process.DThe VPN client verifies a server username/password challenge by using a AAA authentication server that supports TACACS+ or RADIUS.EThe VPN server can only be enabled on Cisco PIX Firewalls and Cisco VPN 3000 series concentrators.FWhen connecting with a VPN client，the VPN server must be configured for ISAKMP group 1，2 or 5.
多选题
Which three statements about the Cisco Easy VPN feature are true？（）
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.
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