Christian Hernandez Ulloa

• Initiated and managed network test facilities to verify network hardness and resilience.
• Provided network support services for devices such as hubs, bridges, routers and other hardware.
• Escalated emergency technical issues beyond knowledge to maintain optimum up-time.
• Turn up new sites with DIA implementations
• Staged new gear to upgrade sites to the newest Cisco Standards.
• Troubleshoot L2 and L3 issues
• Create Heatmaps for new implementations with Ekahau
• Provide estimates on new equipment depending on site's need.

• Create Cisco ACLs to open ports based on clients needs
• Layer 1-2 troubleshooting on Cisco routers, switches, access points and wireless controllers
• Cross-connection for new devices
• Network Refresh
• Network documentation
• Logged, resolved and escalated on-site and off-site issues.
• Diagnosed and resolved hardware, software and network problems and replaced defective components.

• Troubleshooting complex layer 1 and layer 2 issues on Cisco Switches
• Activating new ports on Cisco Switches
• Configuring Cisco 8811 and 8821 Phones using CUCM and Unity
• Supervise IT Vendors on Projects to meet deadlines and standards

• Install and configure Cisco Routers, Switches, WLCs, WAPs, DHCP and integrated network devices into infrastructure
• Provide in-depth, detailed design, implementation and support of LAN/WAN network architecture, including all related network hardware and software. Implements new designs and performs modifications to existing infrastructure
• Respond to escalations, project tasks, and alerts from monitoring systems and ITS Help Desk tickets issued to the ITS Network Team
• Performs basic and complex network trouble-shooting tasks
• Train, guide, and advise other staff on appropriate course of action during identification and troubleshooting of complex LAN/WAN technical issues to minimize network down-time
• Cisco ISE and Cisco Prime troubleshooting
• NAC 802.1x troubleshooting
• Infoblox Troubleshooting
• Cisco Nexus Troubleshooting

• Troubleshoot Escalated Tier II cases which include switching and routing issues in an on-call rotation
• Troubleshoot DHCP/DNS issues in Infoblox,Bluecat,and Microsoft 2003+ -2012 DHCP/DNS Servers
• Troubleshoot Bluecoat WAN Optimizers and Proxy servers
• Experience with EIGRP, OSPF, and BGP routing protocols
• Experience Modifying rules on Cisco ASA,Juniper and Palo Alto Firewalls
• Experience with Cisco Wireless Controllers and Lightweight & Stand Alone Access Points
• Experience running Shell scripts to gather DHCP/DNS information
• Managing Meraki equipment through the Meraki Dashboard

• Experience upgrading Cisco and Juniper appliances

• Responsible for monitoring and surveillance, incident management and resolution, technical support, scheduled maintenance, network configuration, and change request support of CEMEX global I.T. infrastructure.
• Implemented various types of critical network configuration changes for Cisco routers/switches/Wireless devices.
• Work closely with network engineers, field technicians, equipment vendors, and Telecom carriers to troubleshoot and resolve various types of network issues and outages.
• Coordinate and assist with hardware repair and maintenance activities performed by vendors and contractors.