CCNA lab 20
Troubleshooting: OSPF adjacencies and missing routes
Three routers are configured for OSPF area 0 but PC1 cannot reach PC3. Find the faults that stop the adjacencies and the routes, and fix them.
About 30 minutes 5 devices 4 tasksAdvanced
Scenario
A colleague configured OSPF process 1, area 0, on R1, R2 and R3, but the help desk reports that PC1 (192.168.1.0/24) cannot reach PC3 (192.168.3.0/24). There is more than one fault. Use `show ip ospf neighbor`, `show ip ospf interface brief`, `show ip interface brief`, `show running-config` and `show ip route` to find them. Fix the configuration without changing the addressing plan: point-to-point links are /30.
Your tasks
- R1 and R2 form a FULL OSPF adjacency.
- R2 and R3 form a FULL OSPF adjacency.
- R1 learns 192.168.3.0/24 through OSPF.
- PC1 can ping PC3.
The lab checks the result, not the exact commands. For example, a ping task passes only when the ping really succeeds through the network you built.