Network Engineer Security

Network Engineer

YAMINI GAJENDRAN

Phone: +1-351-***-****

Email: ************@*****.***

Professional Summary:

Network & Security Engineer with 5 years of hands-on experience designing, implementing, and optimizing Layer 2/Layer 3 LAN/WAN infrastructures, VPN solutions, and hybrid cloud connectivity (AWS, Azure). Proven track record in delivering high availability configurations, disaster recovery planning, and network security hardening for enterprise environments. Skilled in Cisco, Palo Alto, Fortinet, and Juniper platforms with expertise in routing protocols (EIGRP, OSPF, BGP), SD-WAN, and Zero Trust security models. Adept at firewall management, network performance optimization, and troubleshooting complex connectivity issues to reduce downtime and enhance business continuity. Technical Skills:

Programming Languages: Python, SQL, Shell

Networking: Cisco Routers & Switches, Juniper, HP, Dell, Ubiquiti, Routing Protocols (EIGRP, OSPF, BGP, MPLS), LAN/WAN, VLAN, Subnetting, NAT, IPv4/IPv6, Network Topologies, VPN (IPSec, SSL), IPS/IDS, Network Segmentation, NAC, VPN Configuration, Firewall Management.

Protocols & Standards: TCP/IP, UDP, ARP, DNS, DHCP, SNMP, SSH, FTP, HTTP/HTTPS, IEEE 802.11 (Wireless)

Network Security: Cisco ASA, Palo Alto, Fortinet IPS/IDS, NAC, ACLs, NAT/PAT Firewall & VPN Config

Monitoring and Troubleshooting Tools: SolarWinds, Wireshark, Nagios, PRTG, NetFlow, Packet Analysis, Network Performance Tuning

VoIP: VoIP Configuration, SIP Trunking, QoS, PBX Systems, SIP, H.323

Cloud Networking: AWS VPC, Azure Networking, Direct Connect, ExpressRoute, VPN Gateway,

Virtualization: VMware, Hyper-V, Virtual Network Functions (VNFs)

Operating Systems: Windows Server, Linux, macOS

Databases: MySQL

Version Control: Git, GitHub

Professional Experience:

Trinity Envision Business Services – Frisco, TX Dec 2023 – Present Role: Network & Secuirty Engineer

Responsibilities:

Monitored network capacity and performance to diagnose and resolve complex Layer 2/Layer 3 issues.

Provided network infrastructure support for hubs, bridges, routers, switches, and wireless access points, ensuring 99.9% uptime.

Reduced downtime by 30% through proactive monitoring of network devices and rapid troubleshooting using SolarWinds and Wireshark.

Optimized routing protocols (EIGRP, OSPF, BGP) to improve inter-branch data transfer speeds across LAN/WAN and SD-WAN infrastructure.

Configured and maintained site-to-site IPSec VPNs and client-based SSL VPNs with high availability, supporting secure remote access for over 500 users.

Implemented 802.1X wired and wireless authentication with Cisco ISE, integrating with WLCs and Catalyst switches to strengthen access control.

Developed and applied firewall and routing policies (NAT, PAT, ACLs, route maps) to secure enterprise traffic.

Designed, implemented, and maintained highly available LAN/WAN architectures, incorporating routing, switching, firewall, and SD-WAN technologies to improve uptime by 15%.

Contributed to virtual lab network deployments using VMware and Hyper-V, reducing environment setup time by 30%.

Evaluated, tested, and deployed Palo Alto firewall solutions, configuring routing protocols (RIP, OSPF) and troubleshooting connectivity.

Configured and managed Juniper SRX firewalls and EX/QFX series switches, including interface management, routing, and security policy enforcement.

Utilized SolarWinds NPM and Wireshark to identify, troubleshoot, and resolve network incidents, improving incident response times by 30%.

Applied deep knowledge of the OSI 7-layer model and TCP/IP stack, including multicast routing, to optimize network design and resolve advanced connectivity issues.

Administered F5 LTM/GTM load balancers, managing incident response, service requests, and SSL certificate renewals.

Collaborated with clients, vendors, and cross-functional teams to resolve escalated network incidents and deliver projects on schedule.

Supported and configured DNS, DHCP, VoIP (SIP, H.323), wireless (802.11b/g/n), and network load balancing to enhance enterprise communications.

Designed and tested cloud and on-premises failover strategies using AWS and Azure networking tools.

Integrated Azure ExpressRoute to extend on-premises networks into the Microsoft cloud via private connections, ensuring secure, low-latency communication.

Environment: Cisco Routers & Switches, LAN/WAN, IPSec & SSL VPN, TCP/IP, OSI Model, Multicast Routing, SolarWinds NPM, Wireshark, DNS, DHCP, VoIP (SIP/H.323), 802.11b/g/n Wireless, Load Balancing, AWS, Azure, Cisco ASA, Palo Alto, Fortinet, Juniper, Python, and SD-WAN.

CIS INFRASTRUCTURE PRIVATE LIMITED- India April 2019 – Aug 2022 Role: Junior Network Engineer

Responsibilities:

Supported the maintenance of enterprise LAN/WAN infrastructure using Cisco routers and switches, achieving 99.98% uptime and supporting 1,000+ internal users.

Created comprehensive network topology documentation, device configurations, and SOPs to enhance troubleshooting efficiency and reduce downtime.

Managed IP address allocation within LAN/WAN environments using DHCP best practices for optimal network utilization.

Strengthened network security by implementing firewalls, VPN solutions (IPSec/SSL), and access control systems.

Contributed to the design and deployment of new network infrastructure, improving overall scalability and performance.

Participated in network upgrades to enhance capacity, security posture, and compliance with enterprise standards.

Configured and monitored Layer 3 routing protocols (EIGRP, OSPF) to optimize inter-branch connectivity, reducing latency by 15%.

Collaborated with senior engineers to implement security policies including ACLs, NAT/PAT, VLAN segmentation, and network hardening measures.

Performed deep packet analysis using Wireshark to troubleshoot connectivity issues, reducing resolution time by 40% and improving network reliability.

Provided daily support for remote offices connected via MPLS and VPN, resolving latency, routing, and connectivity issues across multiple sites.

Administered Cisco ASA firewall rule sets and ACLs for internal segmentation and secure internet-bound traffic policies.

Configured and maintained Palo Alto firewalls with policy rules, NAT configurations, application control, and URL filtering.

Managed DNS, DHCP, and SSH services on Windows and Linux servers, ensuring stable access for 1,000+ users.

Participated in WLAN setup and maintenance aligned with IEEE 802.11 standards, improving wireless performance and reducing helpdesk tickets by 25%.

Collaborated with the virtualization team to deploy and test virtual networks using VMware and Hyper-V, cutting lab setup time by 30%.

Configured Azure Virtual Networks (VNets) with NSGs, UDRs, and virtual appliances to secure communication between subnets and on-premises systems.

Maintained detailed network documentation to support troubleshooting, enhance team efficiency, and reduce repeat incidents by 20%. Environment: Cisco Routers and Switches, LAN/WAN, EIGRP, OSPF, Wireshark, DNS, DHCP, SSH, Windows/Linux Servers, IEEE 802.11 WLAN, VMware, Hyper-V, Network Documentation, Palo Alto, Firewall, Fortinet, Cisco ASA, and SolarWinds. Certifications:

Cisco Certified Network Associate (CCNA) – Routing and Switching

Cisco Certified Network Professional (CCNP) – Enterprise

AWS Certified Developer – Associate (Amazon Web Services) Education Qualification:

Master of Science in Computer Science

Fitchburg State University, USA, CGPA - 3.8

Bachelor of Engineering

Prathyusha Engineering College (PEC), Chennai, India

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