Can I just use the VPN features of Windows 2000 and XP instead of using the provided client?
No. The native Windows VPN features do not provide the same level of encryption as the clients that DoIT will provide. In addition, the Windows native VPN features do not support some of the advanced features that are implemented on the Creighton VPN client. Lastly, the Creighton VPN client is pre-configured with authentication keys, encryption algorithm information, no other version of Cisco VPN clients will work with Creightons VPN.