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300-410 Practice Question: Is troubleshooting a route redistribution issue…
A network engineer is troubleshooting a route redistribution issue between EIGRP and OSPF. Routers R1 (EIGRP) and R2 (OSPF) are redistributing routes. The engineer notices that some EIGRP routes are appearing in the OSPF database on R2, but traffic to those destinations is not being forwarded correctly. The show ip route command on R2 shows the redistributed routes with a next-hop of 0.0.0.0. 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 redistribute eigrp command under OSPF is missing the subnets keyword.
When redistributing into OSPF, if the redistributed routes are not directly connected to the redistributing router, the next-hop may be set to 0.0.0.0 (self) if the subnets keyword is missing or if the route is not in the routing table. However, a common cause is that the redistribute command is missing the subnets keyword, causing classful behavior.
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 redistribute eigrp command under OSPF is missing the subnets keyword.
Why this is correct
Correct: Without subnets, the next-hop may be set to 0.0.0.0 for classless routes.
- ✗
The OSPF process on R2 has a route map that is changing the next-hop.
Why it's wrong here
While possible, the missing subnets keyword is a more common and likely cause.
- ✗
EIGRP has a lower administrative distance than OSPF.
Why it's wrong here
Administrative distance affects route selection, not next-hop behavior.
- ✗
The EIGRP routes are not in the routing table on R2.
Why it's wrong here
If they were not in the routing table, they would not be redistributed.
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
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
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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.