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Author: Leigh Anne Chisholm

Focus: CCNA, Switching & Support

Issue Date: Apr 1, 2023

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Layer 2 Switching - Virtual Local Area Networks

This paper, the final tutorial in the CCNA 2.0 LAN Switching series looks at the theory and operation of Virtual Local Area Networks (VLANs). The other CCNA Study Guides on switching are Layer 2 Switching and LAN Switching. After reading this tutorial you should be able to:

  • Define the term "Virtual Local Area Network" or "VLAN"

  • Describe the benefits of implementing VLANs

  • Configure VLANs using Cisco Catalyst IOS-based LAN switches such as the Cisco Catalyst 1900 series switch

  • Identify key differences between Cisco's proprietary ISL and IEEE 802.1Q industry-standard trunking protocols

  • Configure trunking on a Cisco Catalyst IOS-based LAN switch such as the Cisco Catalyst 1900 series switch

  • Identify the purpose of the VLAN Trunking Protocol (VTP)

  • Configure VTP parameters including VTP domain name, VTP password, VTP operational modes (Server/Client/Transparent), and VTP pruning

  • Identify how Cisco's implementation of Spanning Tree Protocol operates when multiple VLANs are configured

  • Identify the appropriate "show" commands to verify VLAN connectivity and ensure proper Spanning Tree operation

  • Describe how to route between VLANs when using ISL

  • Identify commands to troubleshoot common VLAN issues

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