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300-410 Practice Question: The default administrative distance for a route…
What is the default administrative distance for a route learned via the Enhanced Interior Gateway Routing Protocol (EIGRP) summary route?
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
EIGRP summary routes have a default administrative distance of 5, which is lower than the standard EIGRP internal distance of 90 and EIGRP external distance of 170.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
90
Why it's wrong here
90 is the default AD for EIGRP internal routes, not summary routes.
- ✗
170
Why it's wrong here
170 is the default AD for EIGRP external routes.
- ✓
5
Why this is correct
Cisco IOS assigns an AD of 5 to EIGRP summary routes to ensure they are preferred over other routes.
- ✗
1
Why it's wrong here
1 is the AD for static routes, not EIGRP summaries.
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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