Cisco IOS Firewall is a security-specific option for Cisco IOS Software that integrates robust firewall functionality and intrusion detection for every network perimeter. It adds greater depth and flexibility to existing Cisco IOS Security solutions?such as authentication, encryption, and failover?by delivering state-of-the-art security features such as stateful, application-based filtering; dynamic per-user authentication and authorization; defense against network attacks; Java blocking; and real-time alerts.