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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Route Summarization issue:
R1# debug eigrp packets
EIGRP: Sending HELLO on Serial0/0/0 src 10.1.1.1, dst 224.0.0.10 EIGRP: Received UPDATE on Serial0/0/0 from 10.1.1.2 src 10.1.1.2, dst 224.0.0.10 update type: route prefix 10.0.0.0/16 metric 128576 EIGRP: Sending UPDATE on Serial0/0/0 to 10.1.1.2 update type: summary prefix 10.0.0.0/16 metric 128576
What does this output indicate?
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
✓
R1 is receiving and re-advertising the summary route 10.0.0.0/16, likely configured with a summary address.
The debug output shows EIGRP packet exchanges. R1 receives an UPDATE for prefix 10.0.0.0/16 and then sends an UPDATE with type 'summary' for the same prefix. This indicates that R1 is both learning and advertising a summary route.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 is receiving and re-advertising the summary route 10.0.0.0/16, likely configured with a summary address.
Why this is correct
The 'summary' update type indicates R1 is actively summarizing and advertising the route.
- ✗
R1 is only receiving the summary route and not advertising it.
Why it's wrong here
The output shows R1 sending an UPDATE with type 'summary'.
- ✗
The summary route is being suppressed due to a route filter.
Why it's wrong here
No suppression is indicated; the route is being advertised.
- ✗
The summary route is learned via OSPF and redistributed into EIGRP.
Why it's wrong here
The debug shows EIGRP packets only, not redistribution from OSPF.
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
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.