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300-410 Practice Question: An engineer is troubleshooting a route…
An engineer is troubleshooting a route redistribution issue between OSPF and EIGRP. R1 runs both protocols and redistributes OSPF into EIGRP. The engineer notices that OSPF routes redistributed into EIGRP have an AD of 170, but some routes from OSPF are not being redistributed. 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 OSPF routes are not in the routing table because they are overridden by a static route with AD 1.
Redistribution into EIGRP requires matching routes; by default, only routes in the routing table are redistributed. If OSPF routes are not in the routing table because they are overridden by another protocol with lower AD, they will not be redistributed.
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 routes have a higher metric than the EIGRP routes.
Why it's wrong here
Metric does not affect redistribution; only the presence of the route in the routing table matters.
- ✓
The OSPF routes are not in the routing table because they are overridden by a static route with AD 1.
Why this is correct
If a static route with AD 1 exists for the same prefix, the OSPF route will not be installed, and redistribution will not include it.
- ✗
The redistribute ospf 1 metric 10000 command is missing.
Why it's wrong here
A missing metric can cause redistribution to fail, but the question states some routes are redistributed, so the command is present.
- ✗
The OSPF routes are external type 2, which are not redistributed by default.
Why it's wrong here
OSPF external routes are redistributed by default; there is no restriction based on type.
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.
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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.