Date Added: Sep 2010
Enterprise networks face a variety of threats including worms, viruses, and DDoS attacks. Development of effective defenses against these threats requires accurate inventories of network devices and the services they are running. Traditional vulnerability scanning systems meet these requirements by periodically probing target networks to discover hosts and the services they are running. This polling-based model of vulnerability scanning suffers from two problems that limit its effectiveness - wasted network resources and detection latency that leads to stale data.