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350-401 Practice Question: Which three statements about EIGRP route…
Which three statements about EIGRP route summarization are true? (Choose three.)
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
✓
Manual summarization is configured using the 'ip summary-address eigrp <as> <prefix> <mask>' command on an interface.
EIGRP supports manual summarization on any interface and automatic summarization at classful boundaries (disabled by default in modern IOS). Summary routes are advertised with a metric based on the component 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.
- ✓
Manual summarization is configured using the 'ip summary-address eigrp <as> <prefix> <mask>' command on an interface.
Why this is correct
Correct because this is the standard command to configure a manual summary route on a specific interface.
- ✗
Automatic summarization is enabled by default in EIGRP for IPv4.
Why it's wrong here
Incorrect because automatic summarization is disabled by default in Cisco IOS versions 15.0 and later.
- ✓
A manual summary route is advertised with a metric equal to the best metric among the component routes.
Why this is correct
Correct because EIGRP uses the best metric of the included more specific routes for the summary.
- ✗
Summary routes are always preferred over more specific routes in the routing table.
Why it's wrong here
Incorrect because more specific routes (longest prefix match) are always preferred over summary routes.
- ✓
EIGRP will install a discard route (null0) for the summary prefix to prevent routing loops.
Why this is correct
Correct because EIGRP automatically adds a route to Null0 for the summary prefix to avoid black holes if a more specific route is missing.
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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Last reviewed: Jun 18, 2026
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