hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures EIGRP named mode on a…
An engineer configures EIGRP named mode on a router. After configuration, a directly connected EIGRP neighbor is not forming an adjacency. 'show ip eigrp neighbors' shows nothing. Which is the most likely explanation?
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 'network' command was used under the EIGRP process, but the 'af-interface' configuration was omitted.
In EIGRP named mode, the network statement is not used. Instead, the 'af-interface' configuration under the address-family is mandatory to enable EIGRP on an interface. If the engineer only uses the classic 'network' command under the router eigrp process (which is still accepted in named mode for backward compatibility but does not activate the interface), the interface will not be enabled for 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 'network' command was used under the EIGRP process, but the 'af-interface' configuration was omitted.
Why this is correct
In named mode, the 'af-interface' command is required to enable EIGRP on an interface; the 'network' command alone does not activate the interface.
- ✗
The EIGRP autonomous system number is mismatched.
Why it's wrong here
An AS number mismatch would cause the neighbor to appear in 'show ip eigrp neighbors' with a state of 'Pending' or 'Init', not be completely absent.
- ✗
The K-values are mismatched between the routers.
Why it's wrong here
K-value mismatch would prevent adjacency, but the neighbor would still appear in 'show ip eigrp neighbors' with a state of 'Init'.
- ✗
The passive-interface default command is configured.
Why it's wrong here
Passive-interface would prevent hello packets, but the neighbor would not appear at all; however, this is a classic mode behavior and not specific to the named mode edge case.
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.
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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.