Technical Environment: Cisco (switches, routers, firewalls, Umbrella), VLANs/VPNs/DHCP/DNS/TCP-IP, 802.1x/ISE, Windows Server/AD, M365, EDR/vulnerability management tools, backup/DR systems, PowerShell, network monitoring tools. Maintain LAN/WAN/wireless/VPN connectivity; configure switches, routers, firewalls, and APs; troubleshoot performance issues and outages; keep network documentation current.