hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Which statement about the default behavior of…
Which statement about the default behavior of 'auto-summary' in EIGRP for DMVPN tunnel interfaces in IOS-XE is correct?
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, preventing classful summarization.
In modern IOS-XE versions (15.x and later), auto-summary is disabled by default for EIGRP. This is a change from older IOS versions where it was enabled by default. Disabling auto-summary is essential in DMVPN to prevent incorrect summarization at classful boundaries.
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 and summarizes routes at classful boundaries.
Why it's wrong here
Incorrect. In IOS-XE, auto-summary is disabled by default.
- ✓
Auto-summary is disabled by default, preventing classful summarization.
Why this is correct
Correct. Auto-summary is off by default in IOS-XE.
- ✗
Auto-summary is enabled by default but only for tunnel interfaces.
Why it's wrong here
Incorrect. Auto-summary is disabled by default for all interfaces.
- ✗
Auto-summary is disabled by default but can be enabled only for DMVPN.
Why it's wrong here
Incorrect. Auto-summary is disabled globally, not specifically for DMVPN.
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.