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Introduction to Virtual Local Area Networks (VLANs)

CCNA: 0 to Hero - Comprehensive Network Engineering Bootcamp

Lesson 23: Introduction to VLANs

A Virtual Local Area Network (VLAN) is a logical grouping of devices that share the same broadcast domain, regardless of their physical location on the network.

Why Use VLANs?

  1. Segmentation: Breaking up a large Layer 2 broadcast domain into smaller, more efficient domains.
  2. Security: Isolating user groups (e.g., Guest network isolated from Employee network).
  3. Flexibility: Allowing users to move physically while retaining the same network privileges.

VLAN Types

  • Data VLAN: Carries user traffic.
  • Default VLAN (VLAN 1): Automatically assigned to all ports on a Cisco switch by default. Used for management traffic by older protocols.
  • Management VLAN: A specific VLAN designated for administrative access (SSH, Telnet) to the switch.
  • Voice VLAN: Used for Voice over IP (VoIP) traffic, often prioritized.