mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Route Redistribution issue:
R1# debug ip routing
And sees the following output:
*Mar 1 00:12:34.567: RT: add 192.168.10.0/24 via 10.1.1.2, ospf metric [110/20] *Mar 1 00:12:34.568: RT: add 192.168.10.0/24 via 10.2.2.2, eigrp metric [90/156160] *Mar 1 00:12:34.569: RT: better route for 192.168.10.0/24 via 10.1.1.2, ospf metric [110/20] *Mar 1 00:12:34.570: RT: add 192.168.10.0/24 to rib via 10.1.1.2, ospf metric [110/20]
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
✓
OSPF route is being installed in the routing table because the EIGRP route may have been withdrawn or not learned.
The debug ip routing output shows the routing table process comparing routes from different sources. OSPF has administrative distance 110 and EIGRP has 90, so EIGRP is preferred by default. However, the output shows OSPF being chosen, indicating that the EIGRP route might have been removed or the OSPF route is being redistributed with a lower distance or the EIGRP route is not installed due to 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.
- ✗
OSPF route is preferred over EIGRP because OSPF has a lower metric.
Why it's wrong here
Metric is only compared within the same routing protocol; administrative distance is used between protocols. EIGRP has AD 90, OSPF has AD 110, so EIGRP would normally be preferred.
- ✗
EIGRP route is preferred because it has a lower administrative distance.
Why it's wrong here
The output shows OSPF route being added to RIB, not EIGRP. EIGRP has lower AD but the OSPF route is chosen, possibly because EIGRP route was removed or not present.
- ✓
OSPF route is being installed in the routing table because the EIGRP route may have been withdrawn or not learned.
Why this is correct
The debug shows OSPF route being added to RIB. The EIGRP route is considered but not installed, likely because it was withdrawn or not valid. The router compares and selects the OSPF route.
- ✗
Both routes are installed in the routing table for load balancing.
Why it's wrong here
Only one route is added to RIB. The debug shows only OSPF route being added; the EIGRP route is not installed.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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