Allan Gomez Abarca

• Lead and coordinate SD-WAN cutover activities with customers and providers, including scheduling onsite implementations, conducting pre/post-checks, and ensuring successful failover and failback validation with new public IP assignments.
• Configure and support SD-WAN and firewall environments (Cisco Meraki, Versa SD-WAN), including provisioning WAN links, validating connectivity, and troubleshooting end-to-end traffic flows.
• Implement firewall rule changes, port openings, and subnet configurations based on customer requirements through ServiceNow change management, ensuring proper scheduling, risk mitigation, and validation.
• Perform network readiness checks, including VLAN configuration, port assignments, and static routing, to support successful deployment of firewall and SD-WAN changes.
• Support enterprise customers such as Gilead and Amgen, primarily in switching and network operations, including:Port configuration and activation
  Device decommissioning
  Port-channel and vPC configuration (Cisco Nexus)
  
• Troubleshoot network issues by performing MAC address tracking, analyzing network diagrams, and identifying endpoint connectivity paths across campus environments.
• Manage and monitor network infrastructure using tools such as Cisco DNA Center (DNAC), Syslog, and SNMP, ensuring visibility and proactive troubleshooting.
• Execute all changes via ServiceNow, including change creation, scheduling (often after business hours), implementation, validation (pre/post-checks), and customer confirmation before closure.
• Maintain strong customer communication, providing real-time updates during implementations and ensuring successful delivery of network changes.

Technologies: Cisco Catalyst 9500, Cisco Nexus (vPC), Cisco WLC 9000, Cisco Meraki, Versa SD-WAN, Cisco DNA Center (DNAC), SNMP, Syslog, ServiceNow

• Managed and resolved Wi-Fi network issues using Fortinet access points, including configuration, upgrades, and performance optimization.
• Administered and troubleshot VPN connectivity, internet performance, and firewall operations on FortiGate devices.
• Designed and maintained network monitoring solutions using PRTG, including creating probes, adding sensors for servers, services, switches, and firewalls, and organizing monitoring structures (folders/groups).
• Proactively responded to network alerts (latency, packet loss, traffic spikes), coordinating and escalating with ISPs/providers to ensure service stability.
• Supported enterprise network and voice infrastructure, including troubleshooting IP phones, internet connectivity, and working with PBX systems (VitalPBX) and SBC voice firewalls.
• Performed switch lifecycle management, including hardware replacement, stack configuration, software upgrades, and production deployment.
• Troubleshot complex environments using a wide range of tools and platforms, including Ivanti Connect Secure, Ansible (Linux automation), pfSense, Cisco and Juniper switches, Cisco Nexus core devices, Kibana, Elasticsearch, MariaDB, and VMware vSphere.

• Assisting customers to configure and troubleshooting eBGP iBGP, OSPF, IS-IS, MPLS, VPNs, Tunnels, Vlans Tags, platform such as MX10, MX40, MX80, QFX5120-48Y, QFX5130-32CD
• Handling tickets for ISPs enterprises, RMAs of damage NICs and platforms.
• Layer 1 to 7 OSI/TCP model analysis and troubleshooting.
• LACP, HSRP, VRRP, STP, SNMP, IPsec configurations and troubleshooting.
• Monitoring analysis J-WEB/Tunneling VPN/Firewalls stateful and stateless.

• Implementation of load balancing with firewalls Fortinate Fortigate 50E, 200E, creating VPNs and segmentation for 3 ISPs.
• Configurations, monitoring and troubleshooting of Mikrotik, Ubiquiti, Aruba HPE, Dell server, Cisco Catalyst switches, PBX voice server registration of phones, cabling, testing, IT stuff.
• Configuration and troubleshooting of DNS, DHCP and Radius/AAA services.
• Installation of Voice software PBX, Windows Server, SQL server in a VMware ESXi environment.

• Implementation of QoS scripts on Nokia Alcatel to modify interprises bandwidth.
• Configurations and troubleshooting on Juniper devices, BGP, LDP, MPLS.
• Checking Fiber Optic cabling on Data Center and work with transivers TX/RX adapters.
• Working close technicians, with NOC for monitoring purposes.
• Working designing networks usign tools like Microsoft Visio, creating reports using Word, PowerPoint for montly uptime and bandowth of devices.

• Driving customers to upgrade, password recovery, database backups, restore backups, check integrity by MD5 on Linux and VMware systems.
• Configuration and analysis of traffic on Cisco ASA firewalls, Firepower, Cisco routers & Switches using TCPdumps Linux CLI, Wireshark, or ethanalyser on Nexus OS for troubleshooting.
• Configurations of protocols such as EIGRP, OSPF, IS-IS, BGP, LACP, HSRP, Vlans, and reproduction of issues to create alarms for customers, Syslogs, SNMP traps, Debugs, SNMP OIDs template.
• Driving customers to create automation templates to upgrade and configure multiple protocols using Cisco Prime, Solarwinds, PRTG andPostman API tools.