> For the complete documentation index, see [llms.txt](https://phantanloc.gitbook.io/locpt_wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://phantanloc.gitbook.io/locpt_wiki/homepage/2.it-cntt/vlan-virtual-local-area-network-explanation.md).

# VLAN (Virtual Local Area Network) Explanation

VLAN (Virtual Local Area Network) Explanation

1. What is a VLAN?

A VLAN (Virtual Local Area Network) is a logical segmentation of a physical network into multiple isolated networks. It helps improve performance, security, and network management.

2. Why Use VLANs?

Reduces Broadcast Traffic: Limits the number of devices receiving broadcast messages.

Enhances Security: Devices in different VLANs cannot communicate directly unless allowed.

<figure><img src="https://media.licdn.com/dms/image/v2/D4D22AQECGqp7_k2icg/feedshare-shrink_800/B4DZW9sYMaHkAg-/0/1742644284065?e=1746057600&#x26;v=beta&#x26;t=eXyUdCD2zorHbNyKvABhaJuEjBXk17CCwQ-ryZi0NA0" alt=""><figcaption></figcaption></figure>

Simplifies Management: Devices can be moved between VLANs without changing physical connections.

3. How VLANs Work?

VLANs are created on managed switches, and each port is assigned to a VLAN. Devices within the same VLAN can communicate, but communication between VLANs requires a router or a Layer 3 switch.

4. Types of VLANs:

Data VLAN: Used for regular user data.

Voice VLAN: Dedicated to VoIP phones to reduce latency.

Management VLAN: Used for network administration.

Native VLAN: Handles untagged traffic on trunk links.