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VLAN

20267m

Write a short note on Virtual LAN (VLAN).

Question 9 asks candidates to write short notes on any two listed topics.

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Virtual LAN (VLAN)

A VLAN is a logical grouping of devices into a separate broadcast domain, independent of their physical location, configured on switches.

SVGVector Architecture Diagram (SVG)
Switch VLAN 10 (HR) VLAN 20 (Dev) PC1 PC2 PC3 PC4 Router / L3

Features

  • Each VLAN is its own broadcast domain; inter-VLAN traffic needs a router / Layer-3 switch.
  • Membership by port, MAC address, protocol or IP subnet.
  • IEEE 802.1Q tags frames (4-byte tag with a 12-bit VLAN ID) on trunk links.

Advantages

  • Reduced broadcast traffic and better performance
  • Improved security through logical isolation
  • Flexibility: users can be grouped by function, not location
  • Lower cost and easier network management

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