Sr. Network Administrator

*This position requires a TS/SCI clearance for consideration*

Zachary Piper Solutions is currently seeking a Sr. Network Administrator to support a long-standing DoD Intelligence Program based in Newington, VA. This position is a full time role that will be 100% onsite. This role is critical to maintaining secure, reliable, and high-performance enterprise networking capabilities supporting intelligence missions within a TS/SCI environment. The right candidate will play a key role in enterprise network operations, infrastructure support, network access control, and secure communications across large-scale Cisco-based environments. This individual will support network administration, troubleshooting, automation, compliance, and infrastructure modernization initiatives.

Key Responsibilities:

• Configure, maintain, and support enterprise network switches and routers.
• Monitor network health, performance, and availability.
• Respond to incidents, alerts, and support tickets in accordance with operational procedures.
• Troubleshoot connectivity, routing, and switching issues to restore services rapidly.
• Support and administer Cisco Identity Services Engine (ISE) for network access control and policy enforcement.
• Utilize Cisco DNA Center (DNAC) for policy-based automation, network assurance, and centralized management.
• Assist with deployment and optimization of network automation capabilities.
• Participate in network design discussions and implementation activities.
• Support equipment installation, cabling, fiber connections, and infrastructure buildouts.
• Configure and maintain VLANs, routing policies, trunking, and network segmentation.
• Collaborate with senior engineers on enterprise network enhancement initiatives.
• Maintain secure networking environments supporting mission-critical operations.
• Implement firewall policies, VPN configurations, ACLs, and network access controls.
• Support cybersecurity requirements and compliance standards within a TS/SCI Army environment.
• Adhere to established change management and security procedures.
• Diagnose network performance and connectivity problems.
• Utilize packet analysis and troubleshooting tools including Wireshark and NetFlow.
• Perform root-cause analysis and provide recommendations for service improvements.
• Document network configurations, operational procedures, and change activities.
• Work closely with network engineers, system administrators, and cybersecurity personnel.
• Communicate technical concepts effectively to both technical and non-technical stakeholders.
• Utilize strong interpersonal and technical skills to support customer mission requirements.

Requirements:

• High School Diploma or equivalent.
• 3+ years of enterprise network administration experience.
• Experience configuring and supporting enterprise network switches and routers.
• Strong understanding of TCP/IP, DNS, DHCP, STP, SNMP, and routing fundamentals.
• Hands-on experience with Cisco Identity Services Engine (ISE).
• Experience administering Cisco DNA Center (DNAC).
• Knowledge of firewalls, ACLs, NAT, and VPN technologies.
• Experience with VLANs, trunking, inter-VLAN routing, and segmentation.
• Proficiency using packet capture and analysis tools such as Wireshark and NetFlow.
• Familiarity with enterprise wireless networking technologies and RF troubleshooting.
• Understanding of RADIUS, TACACS+, and 802.1X network access control technologies.
• Active TS/SCI Clearance REQUIRED

Compensation to include:

• Salary Range: $120,000 – $135,000 **depending on experience**
• Full Benefits: Medical, Dental, Vision, 401K, PTO, Sick Leave if Required by Law

This job opens for applications on 8/14/2026. Applications for this job will be accepted for at least 30 days from the posting date

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Keywords: Agile Documentation, Systems Documentation, Network Infrastructure, Defense Programs, TS/SCI Clearance, Government Contracts, Newington, VA, Network Administrator, Cisco, Cisco ISE, Cisco DNA Center, DNAC, Network Operations, Network Engineering, Enterprise Networking, Routing, Switching, TCP/IP, DNS, DHCP, STP, SNMP, VLANs, Inter-VLAN Routing, Network Segmentation, Firewalls, ACLs, NAT, VPN, Wireshark, NetFlow, Network Troubleshooting, Wireless Networking, RF Troubleshooting, RADIUS, TACACS+, 802.1X, Infrastructure Support, Data Center Operations, Army Intelligence, DoD, TS/SCI, Network Security, Enterprise Infrastructure, Cisco Routing and Switching, Secure Networks, Access Control, Network Automation