NetworkManager has pluggable support for Virtual Private Network software, including Cisco compatible VPNs using vpnc.
In a terminal type:
aptitude install network-manager-vpnc network-manager-vpnc-gnome
After installing network-manager-vpnc and the gui (network-manager-vpnc-gnome) for xfce4 or gnome. Left click the NetworkManager panel icon and select VPN Connections>Configure VPN…
From there, import the network’s VPN’s settings file. After connecting you will be prompted for your password.