hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a redistribution issue between…
A network engineer is troubleshooting a redistribution issue between OSPF and EIGRP. Router R3 is redistributing OSPF routes into EIGRP, but some OSPF external routes are not appearing in the EIGRP topology table. The engineer checks the redistribute command under EIGRP and sees a route-map named RM-OSPF that uses a prefix-list to match specific prefixes. The missing routes are permitted by the prefix-list. What is the most likely cause?
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
✓
The route-map is missing a 'set metric' command; EIGRP requires a metric for redistributed routes.
The route-map may have a 'set metric' command that is misconfigured, or the route-map may be missing the 'set metric' command entirely, causing EIGRP to reject the route because it requires a metric for redistributed routes. Alternatively, the route-map might have a 'match route-type' that excludes external type-2 routes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The route-map is missing a 'set metric' command; EIGRP requires a metric for redistributed routes.
Why this is correct
Correct because EIGRP will not accept redistributed routes without an explicit metric.
- ✗
The prefix-list is using the wrong sequence number and is being overridden by a later deny statement.
Why it's wrong here
Incorrect because the scenario says the missing routes are permitted by the prefix-list.
- ✗
The OSPF routes are type-5 LSAs, which cannot be redistributed into EIGRP.
Why it's wrong here
Incorrect because OSPF external routes (type-5) can be redistributed into EIGRP.
- ✗
The route-map is applied to the OSPF process instead of the EIGRP process.
Why it's wrong here
Incorrect because the redistribute command is under EIGRP.
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.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
BGP Prefix Filtering
BGP Prefix Filtering is the practice of controlling which network routes (prefixes) a router accepts or advertises to its BGP neighbors, preventing unwanted or harmful routes from spreading across the internet.
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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.