Key Responsibilities
Design, configure, maintain, and troubleshoot enterprise LAN/WAN network infrastructure.
Configure and manage routers, switches, firewalls, wireless infrastructure, and network devices.
Troubleshoot complex network issues related to connectivity, routing, latency, packet loss, and network performance.
Implement and troubleshoot routing protocols such as OSPF, BGP, EIGRP, and static routing.
Configure and manage VLANs, Trunking, STP, EtherChannel, HSRP/VRRP, and other switching technologies.
Monitor network performance, availability, capacity, and utilization.
Perform network configuration changes, upgrades, migrations, and maintenance activities.
Troubleshoot TCP/IP, DNS, DHCP, NAT, VPN, ARP, ICMP, and other network-related issues.
Work closely with security, systems, cloud, application, and telecom teams to resolve infrastructure issues.
Configure and troubleshoot site-to-site and remote-access VPNs.
Analyze network traffic using tools such as Wireshark and other packet-analysis utilities.




Implement and troubleshoot QoS for critical applications, voice, and video traffic.
Maintain network diagrams, configurations, technical documentation, and operational procedures.
Handle incidents, problems, and changes in accordance with ITIL processes.
Coordinate with ISPs and vendors for WAN, circuit, hardware, and connectivity-related issues.
Participate in network infrastructure projects, audits, upgrades, and disaster recovery activities.

Required Technical Skills
Robust hands-on experience in Networking and Network Infrastructure.
Excellent knowledge of TCP/IP, LAN, WAN, VLAN, VPN, DNS, DHCP, NAT, and subnetting.
Hands-on experience with Cisco routers and switches or equivalent enterprise networking equipment.
Solid understanding of Routing & Switching.
Experience with OSPF, BGP, EIGRP, STP, HSRP/VRRP.
Knowledge of WAN technologies, MPLS, SD-WAN, and Internet connectivity.
Valuable understanding of network se

📌 Senior Engineer Chennai (India)
🏢 3i Infotech
📍 India