Dhana

About Dhana

10 years of experience as a Network/Network security Engineer worked in Global environments in Switching, Routing, Firewalls, Proxies, Application Delivery Controllers, Wireless, WAN Circuits and software Defined Networks. Very Passionate to learn new trends in technology and come up with ideas to enhance Infrastructure availability.Experience with the escalation problems for Routing, Switching and WAN connectivity issues using ticketing systems like remedy and Magic. Worked on Cisco 7200, 3800, 3600, 2800, 2600, 1800 series Routers and Cisco 2900, 3500, 4500, 5500 Switches.•Extensive knowledge in Configuring, troubleshooting and monitoring Palo Alto Firewalls from central management device Panorama M500.•Experience with Bluecoat and Zscaler Proxy servers, LAN & WAN management.•In Depth knowledge of Zscaler Proxy for access management, Web filtering and managing PAC files.•Implementing IP addressing schemes, LAN/WAN protocols, IP Services, to meet network requirements in different environments.•Expertise in Configuration of Virtual Local Area Networks (VLANs) using Cisco routers and multi-layer Switches and supporting STP, RSTP, PVST, RPVST along with trouble shooting of inter-VLAN routing and VLAN Trunking using 802.1Q.•Expert in configuring Threat prevention which includes Anti-Virus, Anti-Spyware and Vulnerability and implementing File Blocking, Wildfire analysis and DoS protection on Palo Alto Firewalls.•Expertise in configuring and deploying Global Protect VPN with multiple Gateways and rolled out to 30k+users.•Expertise with configuring, Implementing and Troubleshooting remote access solutions like IPsec VPN, Remote VPN, SSL VPN, DMVPN.•Extensive knowledge in implementing URL filtering, application-based policies and implementing zones.Worked on MX-80, MX-480, SRX-100, SRX-110, SRX-550 and EX-4200 Juniper devicesStrong knowledge of VMware vSphere administration within Cisco Unified Computing System environment VMware administration experience with vcloud and Hyper-VHands on experience in deployment of GRE tunneling, SSL, Site-Site IPsec VPN and DM VPN.Extensive hands on support of F5 BIG-IP Products including ASM, LTM, GTM and F5 BIG-IQ.Comprehensive expertise in the implementation of optimization, analysis, troubleshooting and documentation of LAN/WAN networking systems.Experience with the Gigamon appliance GigaVUE-HC1 & HC3.

Experience

1. Senior Network Security Engineer Cyber

   Fiserv

   Aug 2025 — Present

   Designed, implemented, and managed enterprise security architecture using Cisco ASA, Firepower, Palo Alto, Fortinet, and Check Point firewalls.Configured VPNs (IPSec, SSL, DMVPN) and site-to-site tunnels for secure remote and inter-site connectivity.Managed LAN/WAN segmentation, VLANs, ACLs, and routing protocols (OSPF, BGP, EIGRP) to ensure network performance and security.Implemented Zero Trust Network Access (ZTNA) and micro-segmentation using Cisco ISE and Tufin SecureTrack.Deployed IDS/IPS and DLP systems to monitor and mitigate potential network intrusions.Developed and enforced security policies, standards, and baselines aligned with NIST CSF and ISO 27001.Conducted risk assessments and implemented mitigation plans for critical network assets.

Education

• Jawaharlal Nehru Technological University

  Bachelor's degree, Electronic and Communication Engineering