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300-410 Practice Question: Is troubleshooting a redistribution loop between…
A network engineer is troubleshooting a redistribution loop between OSPF and EIGRP. Router R7 is redistributing EIGRP routes into OSPF, and also redistributing OSPF routes into EIGRP. The engineer notices that some OSPF routes are appearing in the EIGRP topology table with a higher metric than expected, causing suboptimal routing. 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
✓
Routes are being re-redistributed due to missing route tags; a route-map with 'set tag' should be used to prevent loops.
Redistribution loops can cause routes to be re-injected with different metrics. The most common fix is to use route-maps with tags to prevent re-redistribution. Without proper tagging, routes can loop between the two protocols.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Routes are being re-redistributed due to missing route tags; a route-map with 'set tag' should be used to prevent loops.
Why this is correct
Correct because route tags allow filtering to prevent redistribution loops.
- ✗
The OSPF process has a 'default-information originate' command that is injecting a default route into EIGRP.
Why it's wrong here
Incorrect because this would inject a default route, not affect metrics.
- ✗
The EIGRP process has a 'variance' command that is causing unequal-cost load balancing.
Why it's wrong here
Incorrect because variance affects load balancing, not redistribution metrics.
- ✗
The route-map applied to redistribution is missing a 'match tag' statement to filter out redistributed routes.
Why it's wrong here
Incorrect because the issue is re-redistribution, not filtering of specific tags.
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
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.