System Engineer (NOC) - Enterprise Networking & Automation Expert

KRISHNA CHARAN VALLABHANENI

Email: ****************@*****.*** Tel: +1-417-***-****

PROFESSIONAL SUMMARY

Network Engineer with 4+ years of experience supporting enterprise LAN/WAN, routing, switching, wireless, and firewall operations across multi-site environments. Strong working knowledge of Cisco infrastructure, VLANs, OSPF, BGP fundamentals, and VPN connectivity, with solid troubleshooting experience in production networks. Experienced with Palo Alto, FortiGate, and Cisco ASA firewalls for ACL updates, NAT configuration, VPN support, and security policy changes. Skilled in Cisco and Aruba wireless environments, including SSID mapping, RF tuning, roaming optimization, and end-user connectivity issue resolution. Familiar with AWS and Azure networking concepts such as VPCs, VNets, route tables, IPsec tunnels, and hybrid connectivity validation. Knowledge of Python and Ansible for automating routine checks, improving operational consistency, and reducing repetitive manual tasks.

TECHNICAL SKILLS

• Networking: LAN/WAN, TCP/IP, IPv4/IPv6, DHCP, DNS, VLANs, STP, RSTP, EtherChannel, QoS, WLAN

• Routing & Switching: Cisco Catalyst, Cisco Nexus, OSPF, EIGRP, BGP, Static Routing, Inter-VLAN Routing, HSRP, VRRP

• Firewalls & Security: Palo Alto, FortiGate, Cisco ASA, ACLs, NAT/PAT, IPsec VPN, SSL VPN, IDS/IPS, TACACS+, RADIUS, 802.1X

• Wireless: Cisco WLC, Cisco Aironet APs, Aruba APs, Aruba Controllers, SSID/VLAN Mapping, RF Optimization, WPA2/WPA3

• Cloud Networking: AWS VPC, Azure VNets, Route Tables, NSGs, Transit Gateway, ExpressRoute, Hybrid Connectivity

• Monitoring & Troubleshooting: SolarWinds, PRTG, Wireshark, NetFlow, SNMP, Splunk, tcpdump, Nmap, Traceroute, Nslookup

• Automation & Tools: Python, Ansible, Bash, PowerShell, Visio, Lucidchart

• Operating Systems: Windows Server, Linux, Cisco IOS/XE, NX-OS, JunOS

• Process & Documentation: ITIL Change Management, Network Diagrams, MoPs, Incident Support, Basic Disaster Recovery Documentation

PROFESSIONAL EXPERIENCE

Comerica Loans Jan 2025 – Present

Network Engineer

• Supported network operations across 40+ branches through Cisco SD-WAN, routing updates, and QoS tuning.

• Verified AWS and Azure connectivity using BGP and IPsec tunnels under senior engineering guidance.

• Performed HSRP and VRRP failover checks to confirm resiliency during maintenance and network events.

• Applied Palo Alto and FortiGate firewall updates to maintain secure communication across network zones.

• Resolved VLAN, STP, and EtherChannel issues on Cisco Catalyst and Nexus switches.

• Reviewed QoS behavior for voice and video traffic and assisted with collaboration service troubleshooting.

• Troubleshot Cisco WLC and Aruba wireless issues involving roaming, RF performance, and client access.

• Monitored circuits and devices using SolarWinds, Splunk, SNMP, and NetFlow to investigate alerts.

• Diagnosed packet loss using tcpdump and identified MTU mismatches and routing inconsistencies.

• Developed Python and Ansible health-check scripts to improve validation accuracy and reduce manual effort. Coforge Jul 2020 – Jun 2023

Network Engineer

• Supported LAN/WAN operations for 3,000+ users across multiple sites and handled daily network incidents.

• Worked on OSPF and BGP troubleshooting to resolve routing instability and failover communication issues.

• Tested HSRP and VRRP redundancy to reduce disruption during outages and maintenance windows.

• Configured and troubleshot Cisco Catalyst and Nexus switching across branch and campus environments.

• Managed FortiGate and Cisco ASA firewall tasks, including NAT changes, VPN issues, and policy updates.

• Reviewed AWS VPC tunnel status and route propagation for secure cloud-to-on-premises communication.

• Analyzed latency and packet flow issues using Wireshark and NetFlow to identify congestion points.

• Supported IOS and NX-OS upgrades by validating readiness and assisting with rollback planning.

• Automated configuration backups using Python, TFTP, and SCP, improving recovery readiness and saving time.

• Improved Cisco and Aruba wireless performance through RF tuning and SSID-to-VLAN alignment. EDUCATION

• Master of Science

University of Colorado, Denver

• Bachelor’s in Electrical & Electronics Engineering TKR College of Engineering & Technology

CERTIFICATION

• Cisco Certified Network Associate (CCNA)

Contact this candidate