In a typical installation we try to understand the customer needs and look at the security related targets that needs to be protected. This is done with ether a verbal or written interview with the organization personal in the business level and the IT level.
After this stage we offer a suite of security products that protect the organization corresponding to the OSI network level modeling. We usually use a Firewall and IPS to deal with the 1-4 levels and more complex solutions to protect the 4-7 levels with supporting systems to correlate the information and control the complex environment. http://www.websense.com/