Multi-VLAN Segmentation: 3 VLANs & Trunk Alignment

Bundle lab · $29.99

Hands-on CCNA campus switching lab with two Layer-2 switches and three VLANs (Users 10, Servers 20, Management 99) extended over a single 802.1Q trunk. Learners deploy VLANs and access ports, harden the trunk (native VLAN 999, explicit allow-list, nonegotiate), and validate isolation. The lab ships with a trunk-carried outage: VLAN 10 traffic reaches its gateway successfully, but VLAN 20 traffic does not. You will diagnose from end hosts, confirm switch states, and correct the trunk so that same-VLAN traffic to the gateway SVI succeeds while inter-VLAN forwarding remains absent.

Learning objectives

• Design a three-VLAN segmentation (Users 10, Servers 20, Management 99) across two Layer-2 switches.
• Configure access ports and correctly place one host in each VLAN.
• Build and harden an 802.1Q trunk with an explicit allow-list and non-default native VLAN 999.
• Detect and resolve outages caused by incomplete trunk allow-lists and native VLAN mismatches.
• Verify VLAN isolation (no inter-VLAN forwarding) and end-to-end same-VLAN reachability to the gateway SVI.

Troubleshooting focus

• Verify every link's interface status and IP addressing (`show ip interface brief`) and correct any interface that is down or misaddressed.
• Confirm each device's running configuration matches the lab objective, and bring any interface, route, or service that is not in its expected state back to health.
• Trace end-to-end reachability with ping/traceroute and isolate the first hop where forwarding fails.