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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 ip routing
IP: route table change: 10.0.0.0/16 via 10.1.1.2, Serial0/0/0, distance 90, metric 128576 IP: route table change: 10.0.1.0/24 via 10.1.1.2, Serial0/0/0, distance 90, metric 128576 IP: route table change: 10.0.2.0/24 via 10.1.1.2, Serial0/0/0, distance 90, 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
✓
Both the summary route 10.0.0.0/16 and more specific /24 routes are being installed, which could indicate that summarization is not properly filtering the specific routes.
The debug output shows that multiple routes (a /16 and two /24s) are being installed into the routing table via the same next hop. This indicates that both the summary route and more specific routes are present, which may be a sign of inconsistent summarization or a leak of more specific 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.
- ✓
Both the summary route 10.0.0.0/16 and more specific /24 routes are being installed, which could indicate that summarization is not properly filtering the specific routes.
Why this is correct
The presence of both summary and specific routes suggests that the summary is not suppressing the specifics.
- ✗
Only the summary route is being installed, and the /24 routes are being ignored.
Why it's wrong here
The output shows the /24 routes are also being installed.
- ✗
The summary route is being replaced by the more specific routes.
Why it's wrong here
Both are being installed simultaneously.
- ✗
The routes are being learned via different routing protocols.
Why it's wrong here
All routes have the same distance and metric, suggesting the same protocol.
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JA
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.