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Senior L3/L4 Network Engineer Support Systems

argyle infotechDallas, TX

today

Occupations

Network and Computer Systems AdministratorsComputer Network Support SpecialistsComputer Network Architects

Industries

Computer Systems Design ServicesComputer Facilities Management ServicesComputing Infrastructure Providers, Data Processing, Web Hosting, and Related Services
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About the role

Senior Network Engineer We are seeking an experienced Senior Network Engineer with strong Layer 3 and Layer 4 support expertise to manage, troubleshoot, and maintain enterprise network infrastructure. The candidate will play a critical role in resolving complex networking issues, optimizing network performance, and ensuring high availability of enterprise systems. The role requires strong hands-on experience with routing, switching, TCP/UDP traffic analysis, firewall management, and load balancer configurations.
Key Responsibilities: Provide Level 3 and Level 4 network support for enterprise infrastructure. Troubleshoot complex issues related to routing, switching, and network connectivity. Diagnose and resolve TCP/UDP traffic issues and application connectivity problems. Perform packet capture and analysis using tools such as Wireshark or tcpdump.
Network Infrastructure Management: Manage and maintain routers, switches, firewalls, and load balancers. Configure and troubleshoot VLANs, NAT, VPN, subnetting, and MPLS networks. Support LAN/WAN environments and enterprise network architecture.
Routing & Network Protocols: Configure and troubleshoot dynamic routing protocols such as: BGPOSPFEIGRPEnsure optimal routing and network stability.
Security & Connectivity: Manage firewall configurations and troubleshoot security-related network issues. Work with VPN technologies and secure network connectivity. Ensure adherence to network security policies and compliance standards.
Performance Monitoring & Optimization: Monitor network performance and proactively identify potential issues. Implement improvements to enhance network reliability, scalability, and performance. Support network upgrades, patching, and infrastructure enhancements. Required SkillsStrong knowledge of TCP/IP networking fundamentals Expertise in Layer 3 and Layer 4 troubleshooting Experience with routing protocols: BGP, OSPF, EIGRPStrong understanding of network technologies: VLAN, NAT, VPN, MPLSHands-on experience with Cisco or Juniper networking devices Experience with firewalls such as Palo Alto, Fortinet, or Cisco ASAExperience with load balancers such as F5 or Citrix Netscaler Strong troubleshooting and analytical skills
Preferred Skills:
  • Certifications such as CCNA, CCNP, or equivalent networking certifications
  • Experience with network monitoring tools and performance analysis
  • Exposure to cloud networking (AWS / Azure / GCP)
  • Familiarity with ITIL processes and enterprise incident management
Top ResponsibilitiesProvide L3/L4 network support for complex enterprise network environments. Troubleshoot routing, switching, and TCP/UDP connectivity issues. Manage and maintain network devices, firewalls, and load balancers.

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JOB OVERVIEW

Experience level

Senior

Location

Dallas, TX

Occupation

Network and Computer Systems Administrators

Industry

Computer Systems Design Services

Posted

today

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