Virtual LAN Basics

Virtual LAN (VLAN) is a network technology that enables network administrators to create logical groups of devices, regardless of their physical location on the network. VLANs allow you to partition a physical network into multiple logical networks that function as separate entities.

In a VLAN, a group of devices is assigned to a particular logical network, and these devices communicate with each other as if they are connected to a dedicated physical network. This means that VLANs provide network segmentation and isolation, which can enhance security and improve network performance.

VLANs are typically implemented in switches, where each port on the switch can be assigned to a specific VLAN. VLANs can be defined based on a variety of criteria, including department, location, or function, depending on the specific needs of the network.

VLANs can also be configured to allow devices in different VLANs to communicate with each other, creating inter-VLAN communication. This is typically achieved through the use of a router or a layer 3 switch that can route traffic between the VLANs. Overall, VLANs are a powerful tool for network administrators to create a more efficient and secure network. By logically grouping devices together, VLANs allow network administrators to apply different network policies and security measures to different groups of devices, which can help to prevent unauthorized access and ensure network performance.