Network Administrator – L2/L3

3 days ago

Hyderabad, India ZL TECH Full time

Role Overview:

As an L3 Network Administrator, you will be responsible for the design, implementation,

administration, and advanced troubleshooting of enterprise network infrastructure. This

includes LAN, WAN, WLAN, firewalls, load balancers, and VPN solutions across data

centers and branch offices. The role requires deep technical expertise, handling

escalations from L1/L2 teams, and ensuring network availability, performance, and

security.

Key Responsibilities:

  • Provide L3 operational support for routers, switches, firewalls, load balancers, and

wireless infrastructure.

  • Manage and configure Cisco, Juniper, Arista, Palo Alto, Fortinet, F5 (or equivalent

platforms).

  • Implement and maintain routing protocols (BGP, OSPF, EIGRP, MPLS) and VLANs.

  • Troubleshoot complex network performance, latency, and packet loss issues.

  • Administer firewall policies, VPNs (IPSec, SSL), and remote access solutions.

  • Manage WAN optimization, QoS, and bandwidth monitoring.

  • Perform firmware/IOS upgrades, patching, and hardware lifecycle management.

  • Support network security initiatives including NAC, IDS/IPS, and DDoS protection.

  • Monitor and analyze network health using tools like SolarWinds, PRTG, Nagios,

Cisco DNA Center, Wireshark.

  • Document network topology, runbooks, and change requests in line with ITIL

practices.

  • Participate in on-call rotation and provide RCA for high-severity incidents.

  • Collaborate with cloud and server teams for hybrid/cloud networking (AWS,

Azure, GCP).

Required Skills & Experience:

  • 6–10+ years of experience in enterprise network administration.

  • Expertise in routing, switching, and firewall administration (Cisco, Juniper, Palo

Alto, Fortinet, etc.).

  • Strong understanding of TCP/IP, DNS, DHCP, NAT, VLANs, STP, HSRP/VRRP.

  • Experience with VPNs, MPLS, SD-WAN, and wireless networks.

  • Familiarity with firewall rules, ACLs, and network security best practices.

  • Proficiency in packet capture and analysis (Wireshark, tcpdump).

  • Knowledge of network automation (Python, Ansible, Cisco DNA/ACI) is a plus.

  • Exposure to cloud networking (VPCs, VPN gateways, load balancers).

  • Willing to work in rotational shift (shift & cab allowances are provided).

  • Prefer male candidates only.

Preferred Qualifications:

  • Cisco Certified Network Professional (CCNP) or higher (CCIE) strongly preferred.

  • Palo Alto, Fortinet, or F5 certifications (PCNSE, NSE, F5-CA) are a plus.

  • Experience in multi-vendor network environments.

  • Knowledge of Zero Trust and SDN solutions (Cisco ACI, VMware NSX, etc.)

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