Advanced knowledge of enterprise LAN switching, including VLAN and trunking design, Spanning Tree Protocol (RSTP/MST), link aggregation (LACP), switch stacking or chassis-based architectures, QoS, and high‑availability access and distribution layer design. Experience supporting and engineering data center switching environments, including hands‑on experience with Cisco Application Centric Infrastructure (ACI), covering fabric design, endpoint groups (EPGs), contracts, policies, and integration with traditional network and virtualization platforms.