Arun Kumar S

Cisco ISE/NAC Engineer with 3+ years of experience implementing, administering, and troubleshooting Cisco Identity Services Engine (ISE) in enterprise environments. Experienced in 802.1X, RADIUS, TACACS+, EAP-TLS, PKI, Active Directory integration, endpoint profiling, guest access, and network access control. Strong troubleshooting skills with authentication, policy, and infrastructure issues.

Cisco ISE NAC Engineer - Tata Consultancy Services

(2022-02 - 2025-05)

• Installed, configured, and administered Cisco Identity Services Engine (ISE) in enterprise environments.
• Implemented 802.1X, RADIUS, and TACACS+ authentication for secure network access.
• Integrated Cisco ISE with Active Directory, VPNs, and firewalls.
• Configured endpoint profiling, guest portals, policy sets, and device administration.
• Configured EAP-TLS/PKI certificate-based authentication.
• Troubleshot authentication failures using Live Logs and RADIUS debugging.
• Performed backups, patching, upgrades, and health monitoring of Cisco ISE nodes.
• Worked with switches, routers, and wireless LAN controllers for ISE integration.

B.Tech - Mechanical Engineering - Bishop Jerome Institute, Kollam (2021)