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Yes Transport Tunneling and IPSec over UDP is Selected on the VPN client.
I found this article : http://security-blog.netcraftsmen.net/2009/01/tcp-and-udp-ports-used-for-cisco-vpn.html
It talks about the three different methods for IPSec to work.
NAT Traversal is said to be the default method for UDP tunneling with the Cisco VPN Client.
How do I know if Zs is configured for NAT Traversal?