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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?