hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Is troubleshooting a route redistribution issue…
A network engineer is troubleshooting a route redistribution issue between EIGRP and BGP. Router R1 runs both EIGRP and BGP, and redistributes EIGRP routes into BGP. The engineer notices that some EIGRP routes are not appearing in the BGP table on R1. The show ip bgp command does not list these prefixes. The redistribute eigrp command is configured under BGP. 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 EIGRP routes are not present in the IP routing table on R1.
When redistributing into BGP, by default only classful networks are redistributed unless the subnets keyword is used. Additionally, BGP does not redistribute routes that are not in the routing table. However, a common cause is that the EIGRP routes are not in the global routing table due to administrative distance or other reasons.
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 redistribute eigrp command under BGP is missing the subnets keyword.
Why it's wrong here
While subnets is important, the more likely cause is that the routes are not in the routing table.
- ✓
The EIGRP routes are not present in the IP routing table on R1.
Why this is correct
Correct: BGP only redistributes routes that are in the routing table; if they are missing, redistribution fails.
- ✗
BGP has a higher administrative distance than EIGRP.
Why it's wrong here
Administrative distance affects route selection, not redistribution.
- ✗
The EIGRP process on R1 has a route filter blocking these routes.
Why it's wrong here
If routes are filtered in EIGRP, they would not be in the routing table, but the question asks for the most likely cause.
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
Introduction to ENARSI Exam and Network Fundamentals
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.