We just cross check with 11.0.6 and 12.1 IPS policy,to enable Network Intrusion Prevention option is not available in 11.0.6 IPS policy whereas in 12.1 we have option to enable the Network Intrusion Prevention.
So that we are confused,, In 11.0.6 client Network Intrusion Prevention feature is installed by default or not..
We have enable the IPS policy for clients..