Layer 2 Networking Support Jobs

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L2/L3 Network Technical Support Engineer – Broadband

Inabia Software & Consulting Inc. Redmond, WA

Redmond, WA

Today

$70 - $75/hr Contract Access Network Isp Service Assurance Layer 2 Networking

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Job Description

Provide post-launch L2/L3 broadband network support for a production network, diagnosing complex connectivity and performance issues end to end.

Responsibilities

Deliver L2/L3 technical support for production broadband network issues after service launch
Troubleshoot complex incidents impacting customer connectivity and service quality, including service degradation, packet loss, latency, routing, reachability, and network performance
Analyze problems across the network stack to determine whether the cause is in access, aggregation, transport, IP, routing, service, or the customer-premises domain
Perform detailed fault isolation to identify contributing elements such as network element, interface, route, configuration, protocol, or service component
Troubleshoot Layer 2 technologies including VLANs, QinQ, Ethernet, ARP, MAC learning, STP, and related access and aggregation technologies
Troubleshoot Layer 3 technologies including IPv4/IPv6, BGP, OSPF/IS-IS, routing policies, VRFs, DHCP, DNS, NAT, and IP connectivity
Use packet captures and network signals such as logs, alarms, counters, routing tables, interface statistics, and telemetry to isolate root causes
Conduct hands-on troubleshooting using CLI and network management or monitoring tools
Validate suspected issues by testing network paths, interfaces, routes, configurations, and service dependencies
Support subscriber connectivity and service troubleshooting, including DHCP/IP assignment, authentication, routing, DNS, CGNAT, and Internet reachability as applicable to the network architecture
Correlate customer-impacting symptoms with network-level events and infrastructure faults
Own or contribute to resolution of complex production L2/L3 incidents
Partner with NOC teams for investigation of incidents that cannot be resolved through standard operational procedures
Determine escalation paths and engage network engineering, architecture, vendor partners, or other technical teams when needed
Drive incidents toward resolution rather than escalating without progress
Conduct root-cause analysis for recurring or high-impact network problems
Develop and document troubleshooting procedures, known-error articles, and operational runbooks
Identify improvements to monitoring, alarms, automation, and operational processes based on recurring issues
Support post-incident reviews and provide technical recommendations to prevent recurrence
Collaborate with network engineering on complex production issues and configuration changes
Validate network changes and troubleshoot after software upgrades, configuration updates, migrations, or new service launches
Support troubleshooting across routers, switches, broadband access equipment, aggregation devices, and IP infrastructure
Work with technology and equipment vendors to investigate hardware, software, protocol, and interoperability issues
Provide technical input toward network design improvements based on production support experience
Participate in planned maintenance and change activities when required
Support troubleshooting during critical incidents and service-impacting events

Requirements

Strong hands-on experience troubleshooting Layer 2 and Layer 3 networks in a production environment
Strong understanding of TCP/IP, Ethernet, VLANs, ARP, DHCP, DNS, IPv4/IPv6, routing, and IP connectivity
Experience troubleshooting routing protocols including BGP and OSPF/IS-IS
Experience with VRFs, routing policies, NAT/CGNAT, QoS, and IP service delivery
Ability to use network device CLI to investigate configuration and operational state
Strong understanding of packet flows and ability to trace a problem hop-by-hop through the network
Experience using packet capture and analysis tools such as Wireshark and tcpdump
Experience interpreting monitoring data including logs, alarms, interface counters, routing tables, and telemetry
Ability to distinguish between customer/device issues, access-network issues, transport issues, IP/routing issues, and application/service issues
Strong analytical and problem-solving skills with the ability to move from symptoms to root cause

Technologies

CLI, Wireshark, tcpdump
Python, Ansible
TCP/IP, Ethernet
VLANs, QinQ, ARP, MAC learning, STP
IPv4, IPv6
BGP, OSPF/IS-IS
VRFs, DHCP, DNS, NAT, CGNAT
QoS
GPON/XGS-PON, OLT/ONT
BNG/BRAS
RADIUS/AAA
MPLS/Segment Routing, MPLS, Segment Routing
Network monitoring and service assurance platforms

Broadband Experience

Broadband service provider experience is strongly preferred
Exposure to Fiber/FTTH and PON technologies such as GPON/XGS-PON, including OLT/ONT
Experience with broadband access and aggregation networks, BNG/BRAS
Experience with DHCP and IP address management, RADIUS/AAA, and CGNAT
Experience with broadband subscriber management
Experience with VLAN/QinQ and MPLS/Segment Routing where applicable
Exposure to IPv6 and dual-stack broadband and DNS
Experience with network monitoring and service assurance platforms

Desired Experience

5+ years of experience in network engineering, network operations, or technical support
Experience supporting large-scale production IP/broadband networks
Experience working in a 24x7 operational environment supporting critical incidents
Experience troubleshooting multi-vendor network environments
Network automation or scripting experience using Python, Ansible, or similar technologies is a plus
Experience with network telemetry, observability, and service assurance platforms is a plus
Relevant networking certifications such as CCNA/CCNP, JNCIA/JNCIP, or equivalent practical experience are desirable

Location / Type / Pay / Work Authorization

Location: Redmond, WA (Onsite 5 days per week)
Type: W-2 Contract
Pay Rate: $70-$75 per hour
Work Authorization: U.S. Citizen or Green Card

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