The world of information security change daily, if not by the minute. New vulnerabilities are discovered. New systems are added.
Companies merge with other companies.
This fluid environment cannot be dealt with effectively with simple or single solutions. Effective information security demands a multi-faceted approach. The Security Puzzle below describes how the different elements of security interact. Intrusion detection systems compare network activity to a database of attacks and sound an alert when a significant event occurs. Such automated tools are useful, but cannot detect attacks not contained in your IDS' database.