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300-410 Practice Question: In EIGRP, what is the default administrative…
In EIGRP, what is the default administrative distance of a summary route created with the 'ip summary-address eigrp' command?
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
✓
5
By default, EIGRP summary routes have an administrative distance of 5, which is lower than the default distance of 90 for internal EIGRP routes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
5
Why this is correct
Correct. EIGRP summary routes default to AD 5.
- ✗
90
Why it's wrong here
Incorrect. 90 is the default for internal EIGRP routes, not summaries.
- ✗
170
Why it's wrong here
Incorrect. 170 is the default for external EIGRP routes.
- ✗
1
Why it's wrong here
Incorrect. 1 is the default for static routes.
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
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