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300-410 Practice Question: Is troubleshooting a route redistribution issue…
A network engineer is troubleshooting a route redistribution issue between RIP and OSPF. Router R1 runs both RIP and OSPF, and redistributes RIP routes into OSPF. The engineer notices that RIP routes are not appearing in the OSPF database on neighboring routers. The show ip ospf database external command on a neighbor shows no external routes from R1. The redistribute rip command is configured under OSPF on R1. 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 rip command under OSPF is missing the subnets keyword.
When redistributing into OSPF, the subnets keyword is required to redistribute classless subnets. Without it, only classful networks are advertised, which may cause many routes to be missing.
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 rip command under OSPF is missing the subnets keyword.
Why this is correct
Correct: Without subnets, only classful networks are redistributed, causing missing routes.
- ✗
RIP has a higher administrative distance than OSPF.
Why it's wrong here
Administrative distance affects route selection, not redistribution.
- ✗
The OSPF process on R1 has a distribute-list blocking these routes.
Why it's wrong here
While possible, the missing subnets keyword is a more common and likely cause.
- ✗
The RIP process on R1 is not running.
Why it's wrong here
If RIP were not running, no routes would be redistributed, but the engineer would likely see other symptoms.
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
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