Network Security Engineer

Network Security Engineer (Cisco ISE)

Tria Federal is seeking a Network Security Engineer to join the Network Engineering Team. In this role, you will collaborate to support a large-scale routing and switching infrastructure, contributing to general network tier support while focusing primarily on the deployment and management of the agency's new network access control platform. The engineer will assist with environment wide policy configuration, handling authentication, device administration, and posture checks for users and endpoints.

This role supports modernization efforts by improving authentication processes and strengthening identity-based access controls. The engineer will troubleshoot connectivity issues, refine policies, and ensure secure, reliable access as the organization completes its system transition.

Basic Requirements

• Experience providing hands-on engineering and troubleshooting support for enterprise Cisco switches and routers within a large-scale network infrastructure
• Responsible for designing, configuring, monitoring, and troubleshooting Cisco ISE as a NAC/NAM platform, including TACACS+/RADIUS services, device administration policies, and wired/wireless 802.1X authentication.
• Experience working with Cisco ISE deployed on Cisco SNS3715 appliances, preferably in a twonode clustered, highavailability setup.
• Experience providing general wireless network support, including basic troubleshooting, controller interactions, and wireless access workflows.
• Handson experience integrating Cisco ISE with Active Directory (AD) and LDAP, including identity lookups, groupbased policy decisions, and directorybased authentication.
• Eight (8) years of experience in a large government organization with five (5) years in technical leadership, including four (4) years implementing, managing and troubleshooting Cisco ISE with expertise in:
• Authentication and authorization policies (RADIUS/TACACS+)
• 1X/EAP methods for wireless and wired access
• Device profiling, posture checks, and endpoint compliance
• Certificatebased authentication (EAPTLS) and PKI integration
• AAA integrations for switches, appliances, firewalls, and wireless controllers
• Experience supporting Cisco ISE integrations with Cisco 9800 Wireless LAN Controllers, including guest/registration page redirection and wireless onboarding.
• Experience migrating legacy NAC, RADIUS, or device authentication systems into Cisco ISE while aligning with Zero Trust principles.
• Four (4) years of experience supporting identitycentric or Zero Trust architectures with strong knowledge of segmentation, certificate management, and endpoint posture controls.
• Solid understanding of telecommunications, network security, and Zero Trust best practices.
• Strong communication skills with the ability to explain Cisco ISE, NAC/NAM, and AAA concepts to both technical and nontechnical audiences.
• Bachelor's degree in Information Technology, Cybersecurity, or a related field.
• Preferred certifications: Cisco CCNP Security, Cisco ISE Specialist, or similar identity/security certifications.

Responsibilities

• Support a large-scale routing and switching infrastructure by assisting the team with the operation and maintenance of Cisco Catalyst 9300, 3850, 2960 and Nexus 2k, 5k, 7k series switches.
• Troubleshoot and resolve Cisco ISE issues across RADIUS, TACACS+, 802.1X, device administration, and endpoint authentication.
• Deploy, configure, and maintain Cisco ISE running on two clustered Cisco SNS3715 appliances, ensuring high availability and consistent policy enforcement.
• Provide general wireless support, including basic troubleshooting, wireless access workflows, and coordination with wireless infrastructure teams.
• Configure and support Cisco ISE integrations with Cisco 9800 WLCs, including guest/registration portals, wireless onboarding, and policydriven access control.
• Integrate and maintain Cisco ISE with Active Directory (AD) and LDAP, including identity lookups, groupbased authorization, and directorybased authentication workflows.
• Deploy, configure, and maintain Cisco ISE components, including:
• Policy Sets, Authorization Profiles, and Authentication Rules
• TACACS+ device administration
• 1X for wired and wireless networks
• Profiling, posture, and compliance policies
• Certificatebased authentication and PKI integrations
• Monitor security events using ISE logs, syslog, and performing root cause analysis for authentication and access issues.
• Manage identity integrations, enforce security policies, and tune configurations to support Zero Trust and improve user experience.
• Perform routine health checks, upgrades, migrations, and document changes through SOPs, engineering designs, and implementation procedures.
• Work closely with engineering, operations, and compliance teams while mentoring junior staff and contributing to knowledge sharing efforts.