venkat - Senior Cisco Nexus Network Engineer

Demonstrated experience with Palo Alto PAN-OS 10.x/11.x.

Demonstrated experience with Cisco Firepower.

Demonstrated experience with Cisco ASA.

Demonstrated experience with Fortinet FortiGate.

Demonstrated experience with Check Point Firewalls.

Support day-to-day stability of Walmart’s large-scale wired and wireless network infrastructure across stores, distribution centers, and corporate environments.. Participate in a 24x7 on-call rotation as a Tier 3 escalation engineer, troubleshooting complex WAN, SD-WAN, firewall, and routing incidents affecting multiple locations.. Contribute to the deployment and operational support of Versa SD-WAN, assisting with site turn-ups, policy changes, traffic steering, and failure recovery.. Assist with network hardware refreshes and technology rollouts by executing planned changes, validating post-change behavior, and resolving issues during cutovers.. Work with Infrastructure Architects and senior engineers to review designs and implement approved network solutions.. Configure and support routing, switching, DNS, firewalls, load balancers, and WAN connectivity in hybrid on-prem environments.. Support enterprise wireless networks by troubleshooting coverage, authentication, and performance issues in production.. Monitor network health and capacity metrics, identify recurring operational issues, and contribute to remediation efforts.. Maintain and enhance monitoring, logging, and alerting to improve visibility and reduce incident resolution time.. Implement security controls including firewall policies, segmentation, IPsec VPNs, NAC, and 802.1X in alignment with PCI requirements.. Develop and maintain automation scripts using Python and Ansible to support configuration consistency and reduce manual changes.. Update network diagrams, operational documentation, and change records to support engineering and operations teams.

Served as a hands-on network and security consultant supporting Cisco ISE for both wired and wireless access, handling day-to-day production issues and planned changes.. Took ownership of 802.1X authentication, MAB, and TACACS+ configurations in Cisco ISE, working closely with security and desktop teams to stabilize access issues across the environment.. Acted as an escalation point for routing and connectivity problems involving BGP, OSPF, and EIGRP, troubleshooting issues that impacted multiple sites and critical applications.. Supported campus and datacenter switching environments built on Cisco Nexus and Catalyst platforms, assisting with switch upgrades, configuration changes, and post-change validation.. Assisted with network migrations from older Catalyst switches to newer Nexus and Catalyst platforms, helping plan cutovers and resolve issues during and after migration windows.. Provided operational support for Cisco ASA and Firepower firewalls, including site-to-site VPNs, AnyConnect remote access VPNs, NAT, ACL updates, and high-availability failover testing.. Worked alongside security teams to integrate Cisco ISE with Active Directory and certificate services, troubleshooting authentication failures and endpoint onboarding issues.. Supported F5 BIG-IP LTM environments by assisting with pool updates, health monitor checks, and SSL-related troubleshooting in support of application teams.. Performed packet-level troubleshooting using Wireshark and tcpdump to diagnose intermittent network and authentication issues in production environments.. Help maintain LAN configurations including VLANs, trunking, EtherChannel, and Spanning Tree, addressing loops, misconfigurations, and port-level issues as they arose.. Participated in incident response and outage calls, coordinating with ISPs, vendors, and internal teams to restore services during high-impact network events.. Documented changes, troubleshooting steps, and configurations to support knowledge transfer and smoother handoffs to internal operations teams.