6 hands-on Default Route scenarios you build in your own Cisco Modeling Labs instance and grade against the answer key. Focused Default Route configuration and troubleshooting practice for CCNA and CCNP.
Inject a static default route from an edge router into an EIGRP domain so internal routers and hosts gain internet reachability. You will verify the D*EX 0.0.0.0/0 on the internal router and validate end-to-end connectivity from a branch host through the edge to an ISP-side server.
Build an Internet-edge NAT design that reaches beyond the ISP to a real external network. You will configure dynamic PAT (overload) from a private LAN to a public /29 using a NAT pool on the edge router, with the router’s default route already pointing to the ISP. Verify that an inside host can reach a public server across the ISP and that translations, counters, and default routing reflect the expected state.
Build a small hub-and-branch network to master default static routes and the gateway of last resort. Each branch uses a default route toward the hub; the hub holds specific routes back to branch LANs. Verify routing tables and end-to-end host connectivity, then troubleshoot common misconfigurations.
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Configure a default route on a branch edge router and a return static route on an upstream core router to enable full bidirectional connectivity between a stub branch LAN and a core server LAN. Verify the S* default route, gateway of last resort, and end-to-end reachability from real hosts. Troubleshoot missing default or return paths.
Hands-on IPv6 static and default routing across a 3-router, 2-LAN topology with end-user hosts. You will enable IPv6 unicast routing, apply IPv6 addressing, configure hub-and-spoke static and default routes, and validate bidirectional host reachability. The guide provides scenario context, step-by-step tasks with the why behind each action, and targeted troubleshooting.
Deploy OSPFv2 across a 3-router, 2-LAN branch/core/edge topology. Mark LAN-facing interfaces as passive so they do not send OSPF hellos or form adjacencies. Originate a default route only from the edge router and verify default propagation end-to-end using real client traffic. Includes realistic troubleshooting around missing adjacencies, non-propagating defaults, and unreachable external destinations.
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