easyMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer is troubleshooting an EIGRP issue…
An engineer is troubleshooting an EIGRP issue where a router is not learning a specific route from a neighbor, but other routes from the same neighbor are being learned. The engineer checks the EIGRP topology table and sees that the route is not present. The engineer also checks the neighbor's routing table and confirms that the route exists. What is the most likely cause?
⚠ Common exam trap
Cisco often tests the distinction between inbound and outbound filtering, and candidates may mistakenly think a stub router or metric issue causes selective route absence, but only a distribute-list in can filter a single route from an otherwise fully functional neighbor relationship.
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
✓
A distribute-list in is applied on the local router that filters the specific route.
A distribute-list in applied on the local router can filter specific incoming routes from an EIGRP neighbor while allowing others. Since the neighbor has the route in its routing table and other routes from the same neighbor are learned, the most likely cause is an inbound filter that explicitly denies that particular prefix.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A distribute-list in is applied on the local router that filters the specific route.
Why this is correct
Correct because a distribute-list can filter specific routes based on prefix or other criteria.
- ✗
The neighbor is configured as a stub router.
Why it's wrong here
Incorrect because a stub router would not advertise any routes except connected and summary, so all routes would be missing, not just one.
- ✗
The route is a summary route that is being suppressed by the 'summary-address' command.
Why it's wrong here
Incorrect because summary-address creates a summary route, it does not suppress a specific route.
- ✗
The EIGRP metric for the route is too high, so it is not considered feasible.
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.
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.
Go deeper
Related to this question
About these practice questions
Courseiva writes every 300-410 question from scratch — 1,966 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.