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What is a Virtual Lan (Vlan)?

What is a Virtual Lan (Vlan)?

In today’s world of digital transformation, it is becoming more important than ever to understand the technology that is shaping our digital future. One such technology is a virtual local area network (Vlan), which is quickly becoming an indispensable tool in the modern enterprise. Vlans are part of the larger family of networks known as “virtualization,” which allows multiple physical networks to be combined into one logical entity. In this article, we will explore what Vlans are and how they can be used to increase efficiency and security in an enterprise environment.

What is a VLAN?

In computer networking, a virtual local area network (VLAN) is a logical division of a physical network. Devices in different VLANs cannot communicate directly with each other. A VLAN can be configured to improve security or performance. For example, separating devices that handle sensitive data from the rest of the network can help prevent unauthorized access.

The Different Types of VLANs

There are three primary types of VLANs in common use today: port-based, tag-based, and protocol-based VLANs. Each has its own advantages and disadvantages which will be discussed in more detail below.

Port-based VLANs are the most basic and oldest type of VLAN. In this type of VLAN, each network port is assigned to a specific VLAN. This gives you very granular control over which devices are on which VLAN, but it can be difficult to manage if you have a lot of devices or if your device configuration changes frequently.

Tag-based VLANs are more flexible than port-based VLANs because they allow you to move devices between ports without having to reconfigure the VLANs. In a tag-based VLAN, each device is assigned a unique identifier (called a “tag”) that tells the switch which VLAN the device should be on. This makes it easy to add or remove devices from a VLAN without affecting other devices or changing your overall network configuration.

Protocol-based VLANs are the most advanced type of VLAN and allows you to segment your network based on protocols rather than physical infrastructure. For example, you could create a separate VoIP VLAN for all of your VoIP devices and traffic would be isolated from the rest of your network. This type ofV LAN can be very useful for large enterprise networks, but is not

The Benefits of Using a VLAN

A virtual LAN (VLAN) is a logical group of devices that share the same broadcast domain. Devices in the same VLAN can communicate with each other as if they were on the same physical network. By creating multiple VLANs, you can segregate traffic on your network and improve security. VLANs can also improve network performance by reducing broadcast traffic.

How to Set Up a VLAN

A virtual LAN (VLAN) is a logical group of devices that share the same broadcast domain. VLANs are used to segment a network into different subnets. Setting up a VLAN is a two-step process: first, you need to create the VLAN itself, then you need to assign devices to it.

Creating a VLAN is a simple matter of giving it a name and assigning it an ID number. The ID number is important because it determines which devices will be members of the VLAN. For example, if you create a VLAN with an ID of 1, only devices with an ID of 1 will be able to join that VLAN.

Once you’ve created the VLAN, you need to add devices to it. This can be done manually or through DHCP. If you’re adding devices manually, you’ll need to configure each device with the correct VLAN ID. If you’re using DHCP, you’ll need to configure your DHCP server with the correct information for your new VLAN.

That’s all there is to setting up a VLAN! By creating logical groups of devices, VLANS make it easy to segment your network and keep different subnets separate from each other.

Alternatives to VLANs

There are a few alternatives to VLANs that can be used in order to segment a network. One alternative is to use a Layer 3 switch, which is a type of switch that is capable of routing traffic. Another alternative is to use a router with multiple subinterfaces, each representing a different VLAN. Additionally, it is also possible to use firewall rules in order to segment traffic.


In conclusion, VLANs are a powerful tool for network administrators to segment their networks into manageable chunks. Not only do they offer increased security and performance, but they also allow for easier scalability and cost savings in the long run. With virtual LAN technology becoming more commonplace, it is important that all network admins have a strong understanding of how to configure them correctly and use them effectively.