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300-410 Practice Question: Given the following EIGRP configuration on Router…
Given the following EIGRP configuration on Router R2:
router eigrp 200 network 192.168.1.0 network 10.0.0.0 no auto-summary
Which statement is true about the operation of EIGRP?
⚠ Common exam trap
Cisco often tests the misconception that 'no auto-summary' is the default behavior in all IOS versions, when in fact it must be explicitly configured in older versions (pre-15.0) to avoid classful summarization.
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
✓
EIGRP will advertise 192.168.1.0/24 and 10.0.0.0/8 as exact prefixes.
The 'no auto-summary' command disables automatic classful summarization in EIGRP. Therefore, EIGRP advertises the exact subnet masks configured under the 'network' statements: 192.168.1.0/24 and 10.0.0.0/8, rather than summarizing them to their classful boundaries (192.168.0.0/16 and 10.0.0.0/8). This ensures that all subnets are advertised with their original prefix lengths.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
EIGRP will automatically summarize 192.168.1.0 to 192.168.0.0/16.
Why it's wrong here
Auto-summary is disabled, so no classful summarization occurs.
- ✓
EIGRP will advertise 192.168.1.0/24 and 10.0.0.0/8 as exact prefixes.
Why this is correct
With no auto-summary, subnets are advertised without summarization.
- ✗
EIGRP will only advertise the classful networks 192.168.0.0/16 and 10.0.0.0/8.
Why it's wrong here
Auto-summary is disabled, so classful summarization does not occur.
- ✗
EIGRP will not form neighbor adjacencies due to missing network mask.
Why it's wrong here
Network statements without a mask use the classful address, which is valid for EIGRP.
Visual reference
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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