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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 Redistribution issue:
R1# debug ip bgp updates
And sees the following output:
*Mar 1 00:25:44.789: BGP(0): 10.1.1.2 UPDATE out about 192.168.10.0/24, NEXT_HOP 10.1.1.1, LOCAL_PREF 100, MED 0, origin i, path 65000 65001 *Mar 1 00:25:44.790: BGP(0): 10.1.1.2 UPDATE run, update sent *Mar 1 00:25:44.791: BGP(0): 10.1.1.2 UPDATE in about 10.2.2.0/24, NEXT_HOP 10.1.1.2, LOCAL_PREF 100, MED 0, origin i, path 65002
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 advertising 192.168.10.0/24 to neighbor 10.1.1.2 and learning 10.2.2.0/24 from the same neighbor.
The debug ip bgp updates output shows BGP updates being sent and received. R1 sends an update for 192.168.10.0/24 with AS path 65000 65001 and receives an update for 10.2.2.0/24 with AS path 65002. This indicates BGP is exchanging routes, but if redistribution is expected, the AS path may indicate the route origin.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
BGP is redistributing routes from OSPF into BGP, as shown by the AS path.
Why it's wrong here
The AS path 65000 65001 suggests the route originated from AS 65001, not necessarily redistributed from OSPF.
- ✓
R1 is advertising 192.168.10.0/24 to neighbor 10.1.1.2 and learning 10.2.2.0/24 from the same neighbor.
Why this is correct
The output shows outbound update for 192.168.10.0/24 and inbound update for 10.2.2.0/24, indicating BGP peering is working.
- ✗
The route 192.168.10.0/24 is being filtered due to AS path length.
Why it's wrong here
No filtering is indicated; the update is sent out.
- ✗
BGP is not receiving any routes because of a redistribution issue.
Why it's wrong here
The router is receiving an update for 10.2.2.0/24, so BGP is receiving routes.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
Route Redistribution Between Protocols
Route redistribution between protocols is the process of taking routes learned from one routing protocol and injecting them into another routing protocol so that networks using different protocols can communicate.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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