hardMultiple ChoiceObjective-mapped
300-410 Practice Question: An engineer configures EIGRP named mode on two…
An engineer configures EIGRP named mode on two routers. The engineer notices that route summarization configured under the interface does not generate a summary route in the routing table, even though the component routes are present. The engineer confirms that the summary address is correct and the interface is up. 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 interface is not configured under the EIGRP address-family in named mode
In EIGRP named mode, route summarization is configured under the interface configuration mode using the 'summary-address' command, but it requires that the interface is part of the EIGRP address-family under that named mode. If the interface is not explicitly configured under the address-family, the summary-address command is accepted but does not take effect. This is a common edge case because the CLI accepts the command without error, but the summary is not generated.
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 interface is not configured under the EIGRP address-family in named mode
Why this is correct
Correct. In named mode, the interface must be explicitly enabled under the address-family for summary-address to work.
- ✗
The summary-address command must be configured under the EIGRP process, not the interface
Why it's wrong here
In named mode, summary-address is configured under the interface, but the interface must be part of the address-family.
- ✗
The component routes have a higher administrative distance than the summary
Why it's wrong here
Administrative distance does not affect summary generation; the summary is generated based on the presence of component routes.
- ✗
The summary-address command requires the 'leak-map' option to be specified
Why it's wrong here
The leak-map is optional and used to advertise specific component routes, not required for summary generation.
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.