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300-410 Practice Question: When redistributing routes between OSPF and…
When redistributing routes between OSPF and EIGRP, which of the following is a recommended best practice to prevent routing loops?
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
✓
Apply route filtering using route-maps or prefix-lists to control which routes are redistributed.
To prevent routing loops during mutual redistribution, it is recommended to use route-maps with distribute-lists or prefix-lists to filter routes, and to adjust administrative distances to prefer one protocol over the other. This prevents routes from being redistributed back and forth.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use the same administrative distance for both protocols.
Why it's wrong here
Using the same administrative distance can cause instability and loops.
- ✓
Apply route filtering using route-maps or prefix-lists to control which routes are redistributed.
Why this is correct
Route filtering prevents unwanted routes from being redistributed, reducing loop risk.
- ✗
Increase the default metric to a high value to discourage redistribution.
Why it's wrong here
High metrics do not prevent loops; they only affect path selection.
- ✗
Disable route summarization on both protocols.
Why it's wrong here
Summarization can help reduce the size of routing tables but does not directly prevent loops.
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
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