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300-410 Practice Question: In EIGRP, what is the default behavior of…
In EIGRP, what is the default behavior of auto-summary in IOS-XE versions 15.0 and later?
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
✓
Auto-summary is disabled by default.
Cisco IOS-XE 15.0 and later have auto-summary disabled by default for EIGRP, unlike older IOS versions where it was enabled by default.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Auto-summary is enabled by default.
Why it's wrong here
This was true for older IOS versions, but not for IOS-XE 15.0+.
- ✓
Auto-summary is disabled by default.
Why this is correct
Cisco changed the default to disabled starting with IOS-XE 15.0.
- ✗
Auto-summary is enabled only for EIGRP named mode.
Why it's wrong here
Named mode also defaults to disabled; this is not a distinguishing factor.
- ✗
Auto-summary is disabled only for EIGRP classic mode.
Why it's wrong here
Both classic and named mode have auto-summary disabled by default in IOS-XE 15.0+.
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.