The activity logging functionality of protection / detection hardware or software (e.g. firewalls, anti-virus) shall be enabled, backed-up and reviewed.
The organization shall ensure that event data is compiled and correlated across its critical systems using various sources such as event reports, audit monitoring, network monitoring, physical access monitoring, and user/administrator reports.
The organization shall integrate analysis of events where feasible with the analysis of vulnerability scanning information; performance data; its critical system's monitoring, and facility monitoring to further enhance the ability to identify inappropriate or unusual activity.