Corero Network Security (formerly Top Layer Networks) protects networks from top to bottom. The company makes intrusion prevention systems (IPS) that protect against worms, viruses, spyware, and other malicious content. Its SecureCommand management software handles security event management, alerts, and reporting, as well as tracks updates and policy configuration of IPS hardware. Its Top Layer DDS product family provides application-layer protection against distributed denial of service (DDoS) attacks. The company focuses on the education, financial, government, health care, e-commerce, and service provider sectors. In 2011 Corero bought Top Layer and changed its name.