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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# show ip bgp 10.0.0.0/16
BGP routing table entry for 10.0.0.0/16, version 2 Paths: (1 available, best #1, table default) Advertised to update-groups: 1 Refresh Epoch 1 Local, (aggregated by 65000 1.1.1.1)
10.1.1.2 from 10.1.1.2 (2.2.2.2)
Origin IGP, metric 0, localpref 100, valid, external, best Atomic-aggregate
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
✓
The route 10.0.0.0/16 is an aggregate route, and the atomic-aggregate attribute indicates that the AS path may be incomplete.
This output shows the BGP table entry for prefix 10.0.0.0/16. The path is marked as 'aggregated', indicating it is a summary route. The 'Atomic-aggregate' attribute suggests that the route is an aggregate and may have lost some AS path information.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The route 10.0.0.0/16 is an aggregate route, and the atomic-aggregate attribute indicates that the AS path may be incomplete.
Why this is correct
The 'aggregated' keyword and 'Atomic-aggregate' attribute confirm this is a summary route with potential AS path loss.
- ✗
The route is a normal BGP learned route without summarization.
Why it's wrong here
The entry explicitly states 'aggregated'.
- ✗
The route is suppressed and not advertised to neighbors.
Why it's wrong here
The output shows it is advertised to update-group 1.
- ✗
The route is learned via redistribution from OSPF.
Why it's wrong here
The origin is IGP, but that does not specify OSPF redistribution.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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