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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a VRF-Lite redistribution issue:
R1# debug ip routing vrf CUSTOMER_E
Output: RT: add 10.3.3.0/24 via 10.1.1.2, ospf 200 metric [110/20] RT: add 10.3.3.0/24 via 10.1.1.2, eigrp 100 metric [90/131072] tag 0 RT: closer admin distance for 10.3.3.0/24, adding via eigrp 100 RT: add 10.3.3.0/24 to routing table, via eigrp 100
What does this output indicate?
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 route 10.3.3.0/24 is added from EIGRP 100 because it has a lower administrative distance than OSPF.
The 'debug ip routing vrf' command shows route insertion and selection events for a specific VRF. The output shows that route 10.3.3.0/24 is learned from both OSPF 200 (with administrative distance 110) and EIGRP 100 (with administrative distance 90). Because EIGRP has a lower administrative distance, it is chosen as the best path and added to the routing table.
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 route 10.3.3.0/24 is added from OSPF 200 because it has a lower metric.
Why it's wrong here
Incorrect. The route is added from EIGRP 100 due to lower administrative distance, not metric.
- ✓
The route 10.3.3.0/24 is added from EIGRP 100 because it has a lower administrative distance than OSPF.
Why this is correct
Correct. EIGRP AD 90 is lower than OSPF AD 110, so EIGRP route is preferred.
- ✗
The route 10.3.3.0/24 is added from both OSPF and EIGRP, creating an equal-cost path.
Why it's wrong here
Incorrect. Only one route is added (EIGRP), as indicated by 'closer admin distance'.
- ✗
The route 10.3.3.0/24 is not added to the routing table due to a tag mismatch.
Why it's wrong here
Incorrect. The route is added successfully via EIGRP.
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
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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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.