Performs network engineering, setup, configuration, installation, upgrades, advanced troubleshooting, and preventative/remedial maintenance for enterprise routing and switching environments, virtual private networking (VPN), firewalls, voice communications infrastructure/systems (including Voice Over IP), and wireless networking and monitoring systems. Provides Tier-2 and Tier-3 technical support for escalated complex issues in supporting multiple infrastructure platforms related to enterprise routing and switching environments, virtual private networking (VPN), firewalls, voice communications infrastructure/systems (including Voice Over IP), and wireless networking & monitoring systems.