CCNA Static Routing: 3-Router Full-Mesh

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Design and implement a 3-router full-mesh with two edge LANs using static IPv4 routes only. Edges use primary defaults toward the core plus floating (higher AD) backup defaults; the core uses specific routes for the edge LANs. Validate bidirectional reachability, path choice, and failover behaviors from real hosts.

Learning objectives

• Deploy static IPv4 and default routes across a three-router full-mesh so both edge LANs reach each other.
• Use /30 point-to-point transit links and /24 routed LANs at the edges.
• Ensure correct forward and return paths using specific routes on the core and defaults (with floating-backup) on the edges.
• Verify administrative distance selection, RIB/FIB choices, and bidirectional end-to-end host reachability.
• Demonstrate failover by observing path changes and backup default activation when a link is failed.

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.