The physical preconditions to be met in configuring a secure system are described below.

• The hardware running the system, the firewall, the servers, and the internal network should be installed within a server area that is physically isolated from the outside.
• Appropriate controls such as entry and exit management should be applied to prevent non-authorized users from entering the server area.
• No hardware or software that is not necessary for running the system should be allowed to be brought into the server area.