Technical L1 Network Support Engineer

Role: Technical L1 Network Support Engineer

Location: Chennai | 247

Notice Period: Immediate to 30 Days

CCNA certification Mandatory

1. Experience and Qualification Pathways

• 3-5 years of relevant technical experience in network support, enterprise networking, ISP, NOC or managed network services.•
• CCNA-level networking capability, including networking fundamentals, troubleshooting, BGP and OSPF.•
• CCNA/CCNP certification preferred; practical competency demonstrated in interview is essential.
• • Willingness to complete networking refresher, SD-WAN, RF/satellite

Candidates must achieve at least 3/5 in every Must Have category. These core entry requirements cannot be offset by Good to Have or scalability scores.

1 Core Networking Fundamentals

• OSI/TCP-IP models, encapsulation/decapsulation and end-to-end packet flow.
• IPv4/IPv6 addressing, subnetting, CIDR, route summarisation and longest-prefix match.
• Routing and switching, VLANs, access/trunk ports and inter-VLAN routing.
• ARP, ICMP, DNS, DHCP, NAT, default gateways and basic ACL concepts.
• TCP/UDP, ports, three-way handshake, MTU, MSS, fragmentation and Path MTU Discovery fundamentals.
• Interpret interface status/counters, routing tables, logs and network diagrams.

2 OSI-Layer Troubleshooting

• Structured, evidence-led fault isolation from Layer 1 through Layer 7.
• Validate physical connectivity, power, cabling, interface errors and link status.
• Investigate VLAN, MAC learning, ARP and Layer 2 forwarding issues.
• Validate addressing, gateway reachability, routing, NAT and ACL behaviour.
• Investigate TCP establishment, retransmissions, resets, DNS and application reachability.
• Differentiate LAN, customer edge, WAN/ISP, satellite access, cloud and application fault domains.
• Document tests, observations, evidence, impact, likely fault domain and next action.

3 BGP and OSPF

• BGP architecture, AS numbers, eBGP/iBGP and neighbour relationships.
• BGP state machine and troubleshooting failed or unstable peerings.
• Route advertisement/withdrawal, prefix filtering, propagation and best-path fundamentals.
• BGP attributes including local preference, AS path and MED.
• OSPF neighbour formation, adjacency states, areas, router ID, network types and cost.
• OSPF LSA and link-state database concepts at troubleshooting level.
• Investigate missing routes, route selection, reachability and convergence.

4 Wireshark / Packet Analysis

• Capture traffic and use capture/display filters to isolate conversations.
• Interpret Ethernet, ARP, IPv4/IPv6, ICMP, TCP, UDP, DNS and DHCP exchanges.
• Recognise TCP handshake, retransmissions, duplicate acknowledgements, resets and timeouts.
• Use packet evidence to investigate DNS failures, packet loss, latency and application symptoms.
• Correlate captures with logs, counters and reported symptoms.

5 TAC / Customer Handling

• Explain incident investigation and gather relevant evidence.
• Communicate technical findings clearly and professionally.
• Maintain accurate incident notes, timelines, actions and handover details.
• Understand prioritisation, escalation and service-level discipline.
• Follow runbooks and security policies in the agreed 247 operating model.

Key Responsibilities

• Provide L1 technical support for Amazon Leo connectivity and network incidents.•
• Troubleshoot customer LAN, routing, WAN/ISP and, after training, SD-WAN, satellite access and cloud connectivity.•
• Investigate BGP/OSPF reachability within defined L1 scope.• Analyse packet captures, monitoring data, logs and device outputs.•
• Recognise potential terminal, antenna, RF and satellite-link symptoms and follow diagnostic procedures.•
• Maintain incident timelines, evidence, technical notes and customer updates.•
• Escalate complex incidents with problem statement, impact, tests performed and findings.•
• Participate in training, knowledge checks, lab exercises and production-readiness assessments.