22/11/2025
VLAN Configuration & Trunking — How Two Switches Communicate in a Real Network!
Ever wondered how large networks separate departments, isolate traffic, and still allow communication between switches?
This is where VLANs and Trunk Links come in — two of the most important concepts in switching.
In this example, two Cisco switches exchange multiple VLANs using a trunk link, while maintaining separate broadcast domains for HR, Admin, and IT.
🔹 What This Lab Demonstrates
✅ Creating VLANs on each switch
✅ Assigning access ports to specific VLANs
✅ Setting VLAN 50 as the native VLAN
✅ Allowing only shared VLANs (40 & 50) across the trunk
✅ Ensuring both switches maintain proper segmentation and communication
🔹 Why This Matters
VLANs are essential for:
• Network segmentation
• Security isolation
• Reducing broadcast domains
• Scaling enterprise networks
• Enabling multi-VLAN communication over a single link
Trunking ensures that switches can exchange VLAN information while keeping traffic separated and secure.
👉 If you're preparing for CCNA/CCNP, working in enterprise networks, or learning switching fundamentals, this is one of the most practical configurations you’ll use daily.
What other switching topics should we break down next?
