hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer is troubleshooting a network where R1…
An engineer is troubleshooting a network where R1 and R2 are running EIGRP, and R2 redistributes a static route for 192.168.1.0/24 into EIGRP. R1 also learns the same prefix via OSPF from R3 with an AD of 110. The engineer observes that R1 prefers the EIGRP external route (AD 170) over the OSPF route. What configuration change would cause this behavior?
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 engineer applied the distance eigrp 90 100 command under EIGRP, lowering the AD for external routes to 100.
By default, EIGRP external routes have an AD of 170, and OSPF has AD 110, so OSPF should be preferred. If the EIGRP external route is preferred, the AD must have been lowered, likely via the distance command under EIGRP.
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 route is a type 5 LSA, which has a higher AD than type 3 LSAs.
Why it's wrong here
OSPF AD is 110 for all OSPF routes regardless of LSA type, unless modified.
- ✓
The engineer applied the distance eigrp 90 100 command under EIGRP, lowering the AD for external routes to 100.
Why this is correct
This sets the AD for EIGRP internal routes to 90 and external to 100, making the external route (AD 100) preferred over OSPF (AD 110).
- ✗
The OSPF route has a metric of 20, while the EIGRP route has a metric of 2560.
Why it's wrong here
Administrative distance is compared before metric; OSPF AD 110 is lower than EIGRP external AD 170, so metric is irrelevant unless ADs are equal.
- ✗
The static route was redistributed with a route-map that sets the EIGRP metric to 1.
Why it's wrong here
Changing the metric does not affect AD; the EIGRP external route still has AD 170, so OSPF would still be preferred.
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
About these practice questions
This 300-410 question is part of Courseiva's 1,966-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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.