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.

Work arrangement
No