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What is a VLAN and why we need it ?

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A LAN comprises all devices in a broadcast domain
Broadcast domain: A group of devices connected through LAN in which broadcast frame sent by a device will be received by all the devices in that particular LAN.
Virtual LANs are used to create multiple broadcast domains in one or more LANs.
For example, 2 VLANs can be created in one switch by assigning some ports into one broadcast domain (VLAN1) and some into another (VLAN2). Thus creating multiple broadcast domains. The frame sent by the device in VLAN1 would never be forwarded to VLAN2 even all are connected in the same switch.

Why we need VLANs?

·         Reduces security risks by limiting the number of devices that receive copies of frames flooded by the switches.
·         Reduces CPU overhead on every device by decreasing the number of devices that receive broadcast frame.
·         Strengthens security for hosts that transmit confidential data by letting those hosts in an isolated VLAN.

·         Provides flexible designs to group users by department, or by groups that work together.


    Enhance your knowledge by learning Multiswitch VLANs
    How to configure VLAN Trunking?






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