CCNA Day 7: Layer 3 Static Routing Capstone

Archive lab

Build a realistic two-site branch topology with two edge routers linked over a /30 WAN and two isolated LANs on a shared L2 access switch. Configure static routes plus a default route at each edge so both LANs reach each other bidirectionally. Verify end-to-end from hosts and use show commands to confirm the routing tables.

Learning objectives

• Design a small routed enterprise topology with clear Layer 3 boundaries
• Address and bring up a /30 point-to-point WAN transit
• Configure LAN gateways and default gateways for hosts
• Apply specific static routes and a default route on each edge router
• Verify and troubleshoot bidirectional end-to-end reachability

Troubleshooting focus

• Detect and fix missing return routes that cause one-way pings
• Correct interface shutdowns and wrong port/VLAN assignments on the switch
• Resolve wrong masks or next-hop IPs that break adjacency or blackhole traffic
• Identify routing loops or defaults pointing to the wrong neighbor