hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures mutual redistribution…
An engineer configures mutual redistribution between OSPF and EIGRP on a router. After a few minutes, the router's CPU spikes and routing loops occur. Which is the most likely explanation?
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 redistributed from OSPF into EIGRP are then redistributed back into OSPF, creating a feedback loop.
Mutual redistribution without route tagging or filtering can cause a routing loop. A route redistributed from OSPF into EIGRP can be redistributed back into OSPF, creating a feedback loop. This is a classic redistribution loop.
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 seed metric for EIGRP was not configured, causing the route to be redistributed with an infinite metric.
Why it's wrong here
Missing seed metric prevents redistribution, not causes loops.
- ✗
The administrative distance of the redistributed routes is lower than the original, causing them to be preferred.
Why it's wrong here
AD does not change during redistribution unless explicitly modified; the loop is due to re-redistribution.
- ✓
Routes redistributed from OSPF into EIGRP are then redistributed back into OSPF, creating a feedback loop.
Why this is correct
Without filtering or tagging, redistributed routes can be re-injected into the original protocol, causing instability.
- ✗
The OSPF process ID must match on all routers; otherwise, redistribution fails.
Why it's wrong here
Process ID is local; redistribution does not require matching IDs.
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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