# VLAN A VLAN, or Virtual Local Area Network, is a logical grouping of network devices, typically located on one or more physical network switches, into a single broadcast domain. VLANs are created to provide network administrators with the ability to segment a large network into smaller, more manageable groups, improving network performance, security, and manageability. In a VLAN, devices can communicate with each other as if they were on the same physical network, even if they are located on different physical switches. VLANs are configured by assigning ports on network switches to a particular VLAN, and traffic is then separated by VLAN tags, which are added to the Ethernet frame headers of each packet. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.console.zenlayer.com/glossary/v/vlan.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.