When you hear about security breaches, you think about disruption of services to customers, stolen data and identities, and damage to company reputation. All these externally facing consequences are dire—which is why IT departments have implemented next-generation firewalls with unified threat management, web-application firewalls, layered security, intrusion-detection and prevention solutions, and security information and event management (SIEM) systems. But there is another kind of damage that is only beginning to make the news. Attacks on the computing infrastructure also directly impinge on network management teams.