This user guide for ExtremeCloud IQ (Classic) version 25.10.0 provides comprehensive technical guidance for administering, configuring, and operating a cloud-managed enterprise networking platform that centrally manages access points, switches, routers, and SD‑WAN components. It details end‑to‑end workflows for device onboarding (including Quick Add, Advanced Onboarding, and Digital Twin simulation), unified network policy creation, SSID and user authentication configuration, firmware upgrades, and large‑scale configuration deployment across cloud‑managed, locally managed, and hybrid environments. Key technical content addresses Wi‑Fi 6/6E/7 features such as 6 GHz operation with Automated Frequency Coordination (AFC), anchor and non‑anchor AP designs, fourth‑radio dedicated sensor support, and Smart RF optimization. The guide also covers security and compliance topics including WPA3, NAC integration, role‑based administration, SSO and MFA, logging and audit controls, API access, and troubleshooting tools. Written for network administrators and IT operators, it serves as a practical, task‑oriented reference for deploying, securing, monitoring, and optimizing enterprise networks at scale.