Senior Network Administrator

Coforge; Delhi; On-site; INR 1,800,000 - 2,800,000; Full time

Job summary

Coforge is looking for an experienced Network Administrator – L3 to design, implement, and optimize enterprise LAN/WAN and data center networks in a mission-critical environment in Delhi. You will troubleshoot, configure and manage Cisco devices and security appliances, while supporting SDN/SDA and DNAC deployments.

The role requires hands-on expertise with routing, switching, VLANs, firewalls, VPNs, and wireless networks, with 24x7 incident support.

Qualifications

• B.E./B.Tech in CS/IT/ECE or M.Sc IT/CS or MCA from a recognised university.

Responsibilities

• Administer, configure, monitor, maintain, and troubleshoot enterprise LAN, WAN, and Data Center Networks to ensure maximum uptime and performance.
• Manage and support Cisco Catalyst, Cisco Nexus, core switches, distribution switches, routers, wireless controllers, and network appliances.
• Configure and troubleshoot VLANs, STP, VTP, EtherChannel, Inter-VLAN Routing, HSRP, VRRP, and Layer 2/Layer 3 network services.
• Implement, configure, and optimize dynamic routing protocols including OSPF, BGP, EIGRP, and Static Routing.
• Administer and support Software Defined Networking (SDN), Software Defined Access (SDA), and Cisco DNA Center (DNAC) environments.
• Configure, manage, and troubleshoot Cisco Firepower, Fortinet FortiGate, Palo Alto Firewalls, ACLs, VPNs, and network segmentation policies.
• Manage and support Cisco Wireless LAN Controllers (WLC), Enterprise WLAN Infrastructure, Wireless Security, RF Optimization, and Wireless Troubleshooting.
• Perform advanced troubleshooting and Root Cause Analysis (RCA) for network performance, connectivity, latency, routing, switching, firewall, and security incidents.
• Administer Data Center Networking technologies including Cisco Nexus, VXLAN, EVPN, HA architectures, redundancy protocols, and spine-leaf design.
• Monitor network infrastructure using SolarWinds, PRTG, Nagios, Zabbix, SNMP, Syslog, NetFlow, and analytics platforms.
• Perform capacity planning, bandwidth optimization, performance tuning, and health checks.
• Execute firmware upgrades, software updates, patch management, and lifecycle management of devices.
• Configure and maintain network redundancy, failover mechanisms, and disaster recovery solutions.
• Support network automation initiatives using Python, Ansible, and Cisco DNA Automation.

Skills

L2 support

Cisco Routers & Switches

troubleshooting

configuration

Education

B.E./B.Tech (CS/IT/ECE)

M.Sc. (IT/CS)

MCA

Tools

SolarWinds

PRTG

Nagios

Zabbix

SNMP

NetFlow

Network Analytics Platforms

Job description

Skills Required: L2 support, Cisco Routers & Switches, troubleshooting, configuration

Notice Period: Immediate joiner or up to 1 Month.

Qualification: B.E./B.Tech (CS/IT/ECE) or M.Sc. (IT/CS) / MCA from a recognised university

We at Coforge are seeking a “Network Administrator – L3" with expertise in enterprise LAN, Data Centre Networks, Routing & Switching, Firewalls, and Software Defined Networking (SDN/SDA). The candidate will be responsible for designing, implementing, managing, troubleshooting, and optimising network infrastructure to ensure high availability, security, and performance of mission-critical environments.

Key Responsibilities

• Administer, configure, monitor, maintain, and troubleshoot enterprise LAN, WAN, and Data Center Networks to ensure maximum uptime and performance.
• Manage and support Cisco Catalyst, Cisco Nexus, core switches, distribution switches, routers, wireless controllers, and network appliances.
• Configure and troubleshoot VLANs, STP, VTP, EtherChannel, Inter-VLAN Routing, HSRP, VRRP, and Layer 2/Layer 3 network services.
• Implement, configure, and optimize dynamic routing protocols including OSPF, BGP, EIGRP, and Static Routing.
• Administer and support Software Defined Networking (SDN), Software Defined Access (SDA), and Cisco DNA Center (DNAC) environments.
• Configure, manage, and troubleshoot Cisco Firepower, Fortinet FortiGate, Palo Alto Firewalls, Access Control Lists (ACLs), IPSec VPNs, SSL VPNs, and Network Segmentation policies.
• Manage and support Cisco Wireless LAN Controllers (WLC), Enterprise WLAN Infrastructure, Wireless Security, RF Optimization, and Wireless Troubleshooting.
• Perform advanced troubleshooting and Root Cause Analysis (RCA) for network performance, connectivity, latency, routing, switching, firewall, and security-related incidents.
• Administer Data Center Networking technologies including Cisco Nexus, VXLAN, EVPN, High Availability Architectures, Redundancy Protocols, and Spine-Leaf Network Design.
• Monitor network infrastructure using tools such as SolarWinds, PRTG, Nagios, Zabbix, SNMP, Syslog, NetFlow, and Network Analytics Platforms.
• Perform network capacity planning, bandwidth optimization, performance tuning, and infrastructure health checks.
• Execute firmware upgrades, software updates, patch management, and lifecycle management of network devices.
• Configure and maintain network redundancy, failover mechanisms, and disaster recovery solutions.
• Support network automation initiatives using Python, Ansible, Cisco DNA Automation, and other network orchestration tools.
• Ensure compliance with organizational security standards, network policies, and industry best practices.
• Collaborate with system administration, cybersecurity, cloud, storage, and application teams for seamless infrastructure operations.
• Create and maintain network topology diagrams, inventory records, configuration backups, SOPs, technical documentation, and operational reports.
• Provide L3 support for critical incidents, major outages, escalations, and complex technical issues in 24x7 production environments.