Provides onsite and remote troubleshooting for Layer 1–3 network issues supporting more than 20,000 users. Installs, upgrades, configures, and maintains routers, switches, wireless controllers, IPS systems, VPNs, WAN accelerators, COMSEC/TACLANE devices, and monitoring tools. Handles outage recovery, maintenance tickets, incident documentation, escalation, and network-device reconfiguration while following operational policies and procedures.