Virtual LANs (VLANs) are essential tools for logically segmenting a network, improving security, performance, and organization. In this episode, we explore how VLANs work by assigning different ports to different broadcast domains—even if those ports are on the same switch. You'll learn how VLANs separate voice and data traffic, simplify policy application, and reduce the spread of broadcast traffic. We also introduce best practices for numbering, naming, and documenting VLANs.

We discuss how VLANs are used in real environments to segment departments, devices, or traffic types. You'll see how VLAN design supports scalability and control, particularly when combined with trunking and routing. This foundational knowledge is critical for passing the exam and for understanding how to implement structured, secure networks.