VLAN in Computer Network
A technology known as virtual local area networks (VLANs) allows us to logically split devices on layer 2 (data link layer). The broadcast domain is often divided by layer 3 devices; however, switches can also use the VLAN concept to divide the broadcast domain. A broadcast domain is a section of a network where all devices within the same broadcast domain will receive a packet if it is broadcast by one device. All broadcast packets will be received by devices within the same broadcast domain; however, this feature is only available on switches because routers do not forward broadcast packets.
Features of VLANs
- VLANs can be used to restrict access to particular network resources and divide network traffic. By limiting unwanted access to private information and network resources, this enhances security.
- VLANs can decrease broadcast traffic and enhance network performance by dividing network traffic into smaller logical networks.
- Network administrators may rapidly and simply modify network configurations according to requirements by using VLANs, which can be configured dynamically.
- By enabling several virtual networks to use a single physical network infrastructure, VLANs can lower hardware expenses.
- As a network gets bigger and more complicated, VLANs can be utilized to divide it into smaller, easier-to-manage groupings.
- Network management tasks like configuration, troubleshooting, and maintenance can be made easier by using VLANs, which enable network administrators to group devices together logically rather than physically.
Connection types in VLANs:
If a device is VLAN-aware (a device that knows VLAN formats and VLAN membership) or VLAN-unaware (a device that does not understand VLAN format and VLAN membership), there are three different ways to join devices on a VLAN.
Trunk Link:
Every device linked to a trunk link needs to be aware of VLANs. A unique header known as "tagged frames" ought to be appended to each frame on this.
Access Link:
It links a VLAN-aware bridge to devices that are not aware of VLANs. The access link's frames all need to be untagged.
Hybrid Link:
A hybrid link is a cross between an access link and a trunk link. Devices that are both VLAN-aware and VLAN-unaware are connected here, and they may contain both tagged and untagged frames.
