The security architecture should be developed by both the network design and the IT security teams. It is typically integrated into the existing enterprise network and is dependent on the IT services that are offered through the network infrastructure. The access and security requirements of each IT service should be defined before the network is divided into modules with clearly identified trust levels. Each module can be treated separately and assigned a different security model. The goal is to have layers of security so that a “successful” intruder’s access is constrained to a limited part of the network. Just as the bulkhead design in a.
