Cisco Catalyst 9400 Expansion ModuleThe Cisco Catalyst 9400 Expansion Module is engineered for modern enterprises that prioritize security, scalable performance, and seamless integration with IoT, mobility, and cloud workloads. Built to augment the Catalyst 9400 chassis, this expansion module extends port density, accelerates policy based automation, and fortifies the network with hardware assisted security features. It is designed to meet the demands of distributed campuses, data