Virtual LAN: Introduction on VLAN, Types of VLANs and VLAN Characteristics

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  • Introduction on VLAN

  • Working with examples

  • Types of VLANs

  • Characteristics

  • Advantages

Introduction on VLAN

  • VLAN stands for ‘Virtual Local Area Network’.

  • It is a subnetwork, or a segment of a local area network configured by software, not by physical wiring.

Introduction on VLAN

Introduction on VLAN

  • Reason for segmentation is to make broadcasting possible at the Data Link Layer.

  • The stations in each segment from a group that can be the recipient of a broadcast message.

  • The message can come from some station in the group or from another outside of the group.

  • The idea of VLAN technology is to divide a LAN into logical, instead of physical, segments.

  • The group membership in VLAN’s is defined by software, not hardware.

Example: If a person moves from one group to another, there is no need to change the physical configuration.

Two Switches in a Backbone Using VLAN Software

Two Switches in a Backbone

Two Switches in a Backbone

Types of VLANs

  • A Protocol VLAN- which has traffic handled based on its protocol.

  • Static VLAN- also referred to as port-based VLAN, needs a network administrator to assign the ports on a network switch to a virtual network.

  • Dynamic VLAN- allows a network administrator just to define network membership based on device characteristics, as opposed to switch port location.

VLAN Characteristics

  • Membership: Different vendors use different characteristics such as port number, MAC addresses, IP addresses, etc.

  • Port Number: some uses switch port number as a membership.

  • MAC addresses

  • Combination

  • Combination between switches

    • Time-Division Multiplexing(TDM)

    • Frame Tagging

  • IP Addresses

  • Multicast IP Addresses


  • Manual Configuration

  • Automatic Configuration

  • Semiautomatic Configuration


  • Reduce cost

  • Reduce time

  • Creating virtual workgroups

  • Security

  • Reduce network traffic


Q1. VLAN technology divides a LAN into________ segments.

  1. Physical

  2. Logical

  3. Multiplexed

  4. Framed

Answer: B. Logical

Q2. In a VLAN, the stations are separated into groups by________ .

  1. Physical methods

  2. Software methods

  3. Locations

  4. Switches

Answer: B. Software Methods


#How it works

#Types of VLANs



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