Senior Network Administrator

Title: Network Administrator - L3

Experience: 6+ years

Location: Delhi

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.