Top Network Administrator Jobs

Lead maintenance and optimization of high-security network and server infrastructure across IT/OT environments. Monitor performance, patch and resolve outages, install/configure server OS and directory services, manage support requests, improve system health and capacity, and ensure cybersecurity compliance with NIST, NRC, COMSEC, and DOE frameworks. Collaborate with engineering and OT teams and support desktop/business-systems as needed.

Design, install, configure, secure, monitor, and maintain LAN/WAN, wireless, and VPN infrastructure. Coordinate with vendors/ISPs, implement firmware/patching, support network monitoring, troubleshoot connectivity/performance issues, document configurations and incidents, and assist cybersecurity teams with vulnerability remediation and network security controls. On-site role with occasional travel and after-hours support.

Maintain and monitor company networks, phones, switches, Linux and Windows systems; troubleshoot and resolve network issues; coordinate hardware/software service; support application deployments; manage network providers and evaluate solutions.

Maintain and optimize North America lab and corporate networks: monitor performance, manage vendors and service levels, design and implement upgrades, install/test network hardware and software, provide administration and security (Active Directory, VPN, MPLS), support applications and desktop teams, and communicate status and resolutions to IT management and customers.

The JDNA manages Joint Data Link Network operations, performs system admin duties on Unix/Linux, supports Link 16 equipment, and ensures system performance.

Manage and administer server, storage, and virtualization infrastructure across client environments. Design and operate VMware clusters and VDI, administer Active Directory and domain services, maintain Windows servers, backups, PKI/SSO, and Cisco devices. Validate security controls (NIST/RMF), troubleshoot systems, create architecture diagrams, automate tasks, and mentor junior administrators in a secure, classified environment.

Maintain, monitor, and troubleshoot campus IT infrastructure including VMware, Linux, wireless, VoIP, switches, routers, and firewalls. Ensure system performance, reliability, and security; collaborate with the network team; apply strong troubleshooting, critical thinking, and hands-on skills.

Maintain and secure enterprise WAN/LAN/wireless infrastructure across data centers and remote sites. Configure, troubleshoot, and optimize Cisco network systems, monitor performance, enforce security policies, document configurations, support connectivity issues, assist projects and migrations, mentor junior staff, participate in on-call rotation, and ensure compliance with agency/CJIS standards.

Manage and optimize on-premises and cloud network infrastructure (routers, switches, firewalls, SD-WAN, VPNs). Troubleshoot connectivity and performance, support hybrid cloud networking (Azure/AWS/GCP), implement secure configurations and segmentation, maintain documentation and diagrams, participate in change management, and support automation/IaC initiatives to improve reliability and operations.

Maintain and support wired/wireless networks, routers, switches, firewalls, and servers across multiple manufacturing sites. Troubleshoot connectivity, manage VPNs and firewall rules, administer DNS/DHCP, document topology, perform cabling and physical installs, develop SOPs, and support escalated help-desk issues. Travel regionally 25–50% and perform physically demanding tasks in industrial environments.

Provide on-site network and Smart Building support across corporate offices and managed properties. Monitor LAN/WAN performance, troubleshoot connectivity, assist with IoT device and WAP configuration, perform basic firewall and VPN tasks, deploy and rack networking hardware, complete support tickets, maintain documentation, coordinate with ISPs and vendors, and participate in on-call rotations.

Support and enhance Reply's U.S. internal network environment: administer Cisco enterprise networking, firewalls, VPNs, and hybrid Azure connectivity; manage Windows Server/AD/Entra ID, Microsoft 365, and endpoints; troubleshoot, document, and support multiple office locations with up to 25% travel.

Assist the network administrator in maintaining and configuring network infrastructure (switches, routers, wireless APs), manage WAN/Internet connections, maintain network documentation and maps, perform structured cabling installation and testing, support monitoring systems and PC maintenance, and follow organizational policies and safety procedures.

Operate, configure, and troubleshoot local enclave network infrastructure for DoD mission training environments. Monitor performance, implement optimizations, resolve issues, and assist in security measures to protect DoD information systems.

The Network Administrator supports network infrastructure by managing firewalls, proxy servers, DNS, and network monitoring, focusing on security and efficiency.

The Network Administrator will support the LAN/WAN environment, design and maintain network hardware/software, and oversee network capacity and security.

The Network Administrator will support and maintain the LAN/WAN environment, oversee network design, and manage network equipment under IT Director's guidance.

Responsible for designing, configuring, and supporting IP/MPLS networks for public safety systems, including troubleshooting network issues and managing IP transport.

The role involves troubleshooting and maintaining network infrastructure, resolving outages, and monitoring remote locations for connectivity issues.

Responsible for installing, configuring, and maintaining network hardware and software, monitoring performance, implementing security protocols, and maintaining documentation.

Configure and maintain firewalls, switches, wireless APs, and routing (SD-WAN/WAN). Troubleshoot network issues, support DNS/DHCP and VPNs, maintain firewall rules and IDS/IPS, perform firmware updates and vulnerability scans, document SOPs, participate in on-call rotations, and travel to field sites (up to 25%).

Maintain and secure on-premises and cloud servers, networks, identity, Microsoft 365, backups, telecom, and endpoints for a 24x7 emergency communications environment. Administer virtualization, SANs, firewalls, monitoring, incident response, SOC 2 controls, and create runbooks. Own projects from planning through go-live and provide after-hours callback support for critical issues.

Operate, upgrade, and troubleshoot enterprise routing and switching equipment; perform IOS and firmware upgrades; provision network devices; implement STIGs; draft SOPs; resolve and close network tickets; perform root cause analyses; support implementations, site surveys, and technical refreshes, often independently in remote locations.

Operate, upgrade, and maintain enterprise routing/switching infrastructure; implement VLAN/ACL changes and IOS upgrades; provision and troubleshoot Cisco/Juniper devices and KG-175 TACLANES; perform ticket resolution, root cause analysis, STIG implementation, and draft SOPs. Support site surveys, network implementations, and work independently in remote locations.

Install, configure, and maintain LAN/WAN connectivity and network hardware/software. Monitor availability and performance, respond to Tier 1/2 incidents, implement security controls, configure routers/switches/VLANs, manage DNS/DHCP, document changes and inventory, assist with deployments and troubleshooting, and support threat hunting and mitigation efforts.