Hello,
Symantec Endpoint Protection also installs Symantec Network Access Control software, but Symantec Network Access Control is not enabled. When you update the Symantec Endpoint Protection Manager Console for Symantec Network Access Control, the client Symantec Network Access Control feature automatically appears in the client user interface. Therefore, if you install Symantec Endpoint Protection and purchase Symantec Network Access Control at a later date, you do not need to install Symantec Network Access Control client software.
After you update Symantec Endpoint Protection Manager for SNAC, the Symantec Network Access Control feature on clients appears automatically and you will also see Host Integrity policies at the SEPM console. There is no new version of SEPM required to enable support of SNAC.
You should contact your sales to help upgrading existing SEP software to include SNAC if you do not have one.
Let me know how you plan to proceed with this.
https://www-secure.symantec.com/connect/articles/working-custom-host-integrity-hi-policy-using-custom-requirement-logic
To Install SNAC, Run the setup.exe in the SNAC CD > Selected SEP Manager option of of it..
Just remember to stop the SEPM service on all SEP Managers (Replication Partners if any) before running SNAC setup for SEP Manager
After the successful setup it just took 5 mins (which is my Heartbeat Interval set to) for all my clients to get the SNAC component (no reboot was required)
Well, In Regards to the Find UnManaged Computer in 12.1, pete has already told about the Paul's Statement.