Hi,
Q. DO I have to select one server as unmanaged detector in each VLAN or is there any script for me to do this to query any workstation/server with no AV installed ?
---> SEP client must be installed on the machine which is acting as a unmanged detector.
Any SEP client can act as a unmanaged detector.
When a client is set as an Unmanaged Detector, it locates unmanaged clients on its own local network segment and reports them to Symantec Endpoint Protection Manager. An Unmanaged Detector cannot detect unmanaged clients on network segments other than its own.
How to find which client acting as a unmanged detector.
Reference: http://www.symantec.com/docs/HOWTO55020