hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures route redistribution from…
An engineer configures route redistribution from EIGRP into OSPF. The redistributed routes appear in the OSPF database but are not installed in the routing table of other OSPF routers. 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
✓
The redistributed routes have a metric of 0, which OSPF treats as unreachable.
When redistributing into OSPF, a seed metric must be specified. If not, OSPF defaults to a metric of 20 for external type 2 routes, but if the metric-type is set to 1, the default metric is 0, which may cause the route to be considered unreachable or not installed.
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 OSPF process on the redistributing router does not have a router-id configured.
Why it's wrong here
Missing router-id prevents OSPF from starting, but redistribution would not occur at all.
- ✓
The redistributed routes have a metric of 0, which OSPF treats as unreachable.
Why this is correct
OSPF requires a non-zero metric for external routes; a metric of 0 (default for type 1) can cause the route to be ignored.
- ✗
The administrative distance of OSPF external routes (110) is higher than EIGRP (90), so the EIGRP routes are preferred.
Why it's wrong here
AD comparison occurs after route installation; the issue is that the route is not installed at all.
- ✗
The redistribute command is missing the subnets keyword, causing only classful routes to be redistributed.
Why it's wrong here
Missing subnets keyword causes only classful networks to be redistributed, but the routes would still appear in the database.
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
OSPF Neighbor Adjacency and Basics
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.
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.