Key responsibilities include managing IP/VLAN configurations, creating automation scripts, proactively identifying network issues, performing upgrades/migrations during maintenance windows, evaluating new hardware/firmware, providing fault isolation and repairs, maintaining detailed documentation, managing network resource policies, and assisting with new Branch network implementations. This role involves managing, designing, implementing, and maintaining an organization's network infrastructure, including routers, switches, Firewalls, and wireless devices, covering both LAN/WAN and VoIP systems.