VLANs are one of those topics that seem complicated until they suddenly click. Let's make that happen today. Why VLANs Exist: Without VLANs, you'd need a separate physical switch for every broadcast domain. That's expensive and inefficient. VLANs let you create logical segmentation on a single switch. The Business Case: - HR Department: Needs privacy for sensitive data - Guest WiFi: Should be isolated from corporate resources - VoIP Phones: Require QoS prioritization - Finance: Must comply with data separation requirements One switch, four VLANs, four broadcast domains. Problem solved.