Router-on-a-Stick Troubleshooting Capstone

Bundle lab · $29.99

Advanced CCNA capstone: diagnose and repair a fully-broken three-VLAN router-on-a-stick deployment. One iol-xe router uplinks by 802.1Q trunk to a pure layer-2 ioll2-xe switch, with three alpine PCs on their own access VLANs (10 Sales, 20 Voice, 30 CCTV); after a recent switch and router change, inter-VLAN connectivity is broken or intermittent across all three VLANs. Trace VLAN intent end-to-end from each host through the trunk to the router's subinterfaces, repair whatever faults you find, and verify with end-host pings/traceroutes and IOS show commands.

Learning objectives

• Trace end-to-end VLAN intent across access and trunk ports in a router-on-a-stick design
• Configure and verify router 802.1Q subinterfaces with correct VLAN tags and gateway IPs
• Identify and correct native VLAN mismatches
• Detect and restore missing VLANs on trunk allow-lists
• Prove inter-VLAN forwarding from hosts and validate router and switch state with IOS show commands

Troubleshooting focus

• Detect a missing subinterface for a user VLAN on the router
• Correct an incorrect 802.1Q encapsulation tag on a router subinterface
• Identify a VLAN pruned from the switch trunk allow-list and permit it
• Resolve native VLAN mismatch between router subinterface and switch trunk