Network Administrator

Senior Network Administrator – NAC ARP Guard

Required Skills & Qualifications 6+ years overall network administration with at least 3+ years focused on NAC/ARP Guard in production. Hands‑on with ARP Guard components, policy creation, enforcement modes, and HA setups. Strong understanding of L2/L3 networking: VLANs, STP, trunking, ARP, DHCP, routing basics, multicast/IGMP. Working knowledge of switch OS (Cisco/Aruba/Juniper or equivalent), WLAN controllers, and Windows/Linux endpoints. Experience integrating with identity stores (AD/LDAP), SIEM, and ITSM tools (ServiceNow, Remedy, Jira). Proficiency in change/incident/problem (ITIL) and disciplined documentation. Preferred Skills Experience with 802.1X/EAP‑TLS, RADIUS, and certificate lifecycle. Scripting/automation (Python, PowerShell, Bash) for bulk operations and reporting. Exposure to zero‑trust segmentation approaches and NAC alternatives. Certifications (Preferred) Network: CCNA/CCNP, JNCIA/JNCIS, Aruba ACNSA/ACSP, or equivalent. Security/ITIL: Security+ / CySA+ / ITIL Foundation. Behavioral Competencies Customer‑first mindset, strong ownership and urgency. Excellent written and verbal communication across technical and non‑technical stakeholders. Analytical, detail‑oriented, and calm under pressure. Shift & Availability Business hours with on‑call rotation for critical incidents. Availability for planned change windows, DR/HA tests, and audits. Key Responsibilities 1) NAC Installation & Core Configuration (ARP Guard) 2) Policy, Enforcement & Segmentation 3) High Availability, Clustering & Scalability 4) Operations, Monitoring & Maintenance 5) Troubleshooting & Incident Response 6) Security & Compliance 7) Network Administration (Core Complementary Skills) 8) Decommissioning & Lifecycle Management