easyMultiple Choice
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
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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
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- ✓
5
Why this is correct
EIGRP summary routes created with 'ip summary-address eigrp' are advertised with an administrative distance of 5, unlike internal EIGRP routes (90) or external EIGRP routes (170). This low value ensures the summary is preferred, satisfying the question's default-value constraint.
- ✗
90
Why it's wrong here
EIGRP internal routes carry administrative distance 90, but a summary route created with ip summary-address eigrp is treated as external and assigned 5. The value 90 applies to routes learned natively within the same EIGRP autonomous system, not to summarised advertisements.
- ✗
170
Why it's wrong here
Administrative distance 170 belongs to EIGRP external routes redistributed from another routing protocol, not to summary routes generated by ip summary-address eigrp. That value is correct when redistributing routes into EIGRP from a different source.
- ✗
1
Why it's wrong here
Administrative distance 1 is reserved for statically configured routes, which always win over dynamically learned entries. A summary route advertised by ip summary-address eigrp is installed as an EIGRP external route with distance 5, not as a static route.
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
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