The NC55-SC Cisco NCS 5500 Series System Controller has advanced security features that provide enhanced protection to the network. These features include Access Control Lists (ACLs) to control network access, encryption and decryption of network traffic, and threat mitigation techniques such as Intrusion Prevention System (IPS) and Denial of Service (DoS) protection. Additionally, the system controller has integrated security features like firewalls, VPNs, and VPN acceleration that can be used to protect the network against a wide range of security threats. These advanced security features ensure that the network is protected against unauthorized access and security breaches, while also providing a secure environment for sensitive data and information.