What are configuration rules?  Provide examples.

What will be an ideal response?

Configuration rules are instructional codes that guide the execution of the system when information is passing through it. Rule-based policies are more specific to the operation of a system than ACLs are, and they may or may not deal with users directly. Many security systems require specific configuration scripts that dictate which actions to perform on each set of information they process. Examples include firewalls, intrusion detection and prevention systems (IDPSs), and proxy servers.