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The Cisco C9800 configuration model uses tags, profiles, and policies instead of flat global settings. A clear guide to the five core profiles and how they fit together to drive every AP and WLAN on the controller.

The Cisco Catalyst 9800 is a multiprocess, data-model-driven WLC built on IOS-XE. A deep dive into the hardware and software architecture including processes, dataplane, and fault domains for troubleshooting intelligence.

The Cisco Catalyst 9800 replaces AireOS-based WLCs with a modular IOS-XE platform. A platform overview covering every model, from C9800-L to C9800-CL and embedded, so you can pick the right controller for your deployment.

The Cisco Catalyst 9800 is the current generation of enterprise wireless controllers, built on IOS-XE and designed for Wi-Fi 6, 6E, and 7. A complete reference guide covering models, architecture, config model, and every core feature.

A good VLAN design scales cleanly, keeps STP domains small, and makes troubleshooting obvious. Here is how to plan VLANs for a multi-building campus network.

VLANs provide segmentation, not security. Without explicit hardening — disabling DTP, fixing the native VLAN, enabling DHCP snooping and DAI — your Layer 2 network is wide open to attack.