VLAN Cheatsheet — Cisco CCNA Fundamentals Article Swipe

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BERRAR, Elwin ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.17632/x2rmfz95mf.2

This VLAN cheatsheet provides a clear and structured overview of essential VLAN concepts for learners preparing for the Cisco CCNA certification. It summarizes the core principles of VLAN segmentation and offers a visual reference to support lab work and exam preparation. Included topics: • VLAN segmentation and trunking illustrated through a simple topology • Default VLAN behavior and VLAN ID ranges • Configuration steps for VLAN creation and assigning access ports • 802.1Q trunking, native VLAN configuration, and allowed VLAN lists • Voice VLAN behavior using CDP advertisement • DTP operating modes with an interaction matrix • VTP modes and their operational characteristics • Key verification and troubleshooting commands (show vlan, show interfaces trunk, reset commands) The cheatsheet is designed as a compact visual reference to help students understand how VLANs operate in real lab environments such as Packet Tracer, EVE-NG, and GNS3. It focuses on accuracy, clarity, and alignment with CCNA fundamentals. Additional learning resources are available at https://pingmynetwork.com/network/concepts/vlan-fundamentals

Related Topics

Computer Science

Lock And Key

Network Topology

Concepts

Virtual LAN Computer science Trunking Computer network Troubleshooting Network packet Key (lock) Network topology Internetworking Server Electronic mail

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