Check the "Installation guide" available in the Documentation folder of the CD/DVD page number 193.
Also check the following link
Title: MSI command line reference for Symantec Endpoint Protection 11.0
Web URL: http://service1.symantec.com/support/ent-security.nsf/docid/2007101610183248?OpenDocument&seg=ent&src=_mi&product=SAVCORP&version=11.0&language=english&module=DOC&error=MSI_Com_ref&build=symantec_ent