Make the routing table make sense.
Build practical foundations by tracing how a router chooses where a packet goes next.
Start with directly connected networks
Match each configured interface address to its subnet. Then identify the destination networks that require a route through another device.
Reason about the next hop
The next hop must lead toward the destination. An address that responds is not necessarily the correct forwarding choice.
Check both ends
Verify that the destination side knows how to return traffic to the source subnet. This independent practice supplements study; it is not an official Cisco exam or certification.
The unreachable branch
The Albany branch team reports that clients in 10.41.10.0/24 cannot use the service at 10.41.30.10 after last night's configuration change. Directly connected transit addresses still respond. You are the engineer on call. Investigate the path, identify the cause, and restore service.
Link addressing (2)
- R1 R2
10.41.12.0/30 - R2 R3
10.41.23.0/30
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