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300-410 Practice Question: Is troubleshooting a routing issue in an EIGRP…
A network engineer is troubleshooting a routing issue in an EIGRP network. Router R1 is not learning a specific route from its neighbor R2, even though R2 has the route in its routing table. The engineer checks the EIGRP topology table on R1 and does not see the route. The output of 'show ip eigrp neighbors' shows that R1 and R2 are adjacent. What should the engineer check next?
⚠ Common exam trap
Cisco often tests the distinction between a route being absent from the topology table versus being present but not selected as the best path; candidates may incorrectly assume metric issues or summarization when the real cause is a distribute-list filtering the route before it enters the topology table.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check if a distribute-list in or out is applied under the EIGRP process on R1.
If R1 and R2 are EIGRP neighbors but R1 does not have the route in its topology table, a distribute-list applied inbound on R1 or outbound on R2 could be filtering the route. Distribute-lists use access-lists or prefix-lists to permit or deny routes during the update process, preventing specific routes from being installed in the topology table even though the neighbor adjacency is established.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Check if a distribute-list in or out is applied under the EIGRP process on R1.
Why this is correct
Correct because a distribute-list can filter incoming or outgoing routes, preventing them from being added to the topology table.
- ✗
Check if the route is being summarized on R2.
Why it's wrong here
Incorrect because summarization would create a summary route, not cause a specific route to be missing from the topology table.
- ✗
Check if the EIGRP metric for the route is too high.
Why it's wrong here
Incorrect because if the route is not in the topology table at all, it is not being received, not that it is being ignored due to metric.
- ✗
Check if the route is a connected route on R2.
Why it's wrong here
Incorrect because connected routes are automatically advertised by EIGRP if they are in the EIGRP network statement.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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