hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Notices that routes redistributed from EIGRP into…
A network engineer notices that routes redistributed from EIGRP into OSPF are causing routing loops. Router R1 has the following relevant configuration: router eigrp 100 redistribute ospf 1 metric 10000 100 255 1 1500 router ospf 1 redistribute eigrp 100 subnets metric-type 1 Router R2 shows: show ip route 192.168.1.0 Routing entry for 192.168.1.0/24 Known via "ospf 1", distance 110, metric 20, type E1 Last update from 10.1.1.1, 00:01:30 ago Also, R2 has a default route via R1. What is the root 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
✓
Mutual redistribution without filtering causes a routing loop; apply distribute-list or route-map with tags.
The mutual redistribution between EIGRP and OSPF without route filtering can cause a routing loop. R1 redistributes OSPF into EIGRP, and EIGRP back into OSPF, creating a feedback loop. The E1 metric of 20 suggests the route was redistributed twice. The correct fix is to implement route tagging and filtering to prevent 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.
- ✓
Mutual redistribution without filtering causes a routing loop; apply distribute-list or route-map with tags.
Why this is correct
Without filtering, routes are redistributed back and forth, creating loops. Tags and filters break the cycle.
- ✗
The metric-type 1 should be type 2 to avoid loops.
Why it's wrong here
Metric type does not prevent loops; filtering does.
- ✗
The EIGRP metric values are incorrect; they should match OSPF cost.
Why it's wrong here
Metric conversion is not the root cause of loops.
- ✗
The subnets keyword is missing in the redistribute command for OSPF.
Why it's wrong here
The subnets keyword is present; missing it would cause classful redistribution, not 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.
Go deeper
Related to this question
About these practice questions
Courseiva writes every 300-410 question from scratch — 1,966 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
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.