mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show bgp neighbors 10.1.12.2 advertised-routes
BGP table version is 15, local router ID is 10.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter, x best-external, a additional-path, c RIB-compressed, Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path *> 10.1.1.0/24 0.0.0.0 0 32768 i *> 10.2.2.0/24 10.1.12.2 0 0 65002 i
Total number of prefixes 2
Based on this output, what can be concluded about the route 10.2.2.0/24?
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 10.2.2.0/24 is being advertised back to the neighbor from which it was learned, which is incorrect.
The route 10.2.2.0/24 is being advertised to the neighbor 10.1.12.2 with next hop 10.1.12.2 itself. This indicates that R1 is advertising a route it learned from the same neighbor back to it, which is a classic case of BGP split-horizon or route advertisement causing a potential loop. However, since it is advertised, it may be due to missing AS-path filtering or a misconfiguration.
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 10.2.2.0/24 is being advertised back to the neighbor from which it was learned, which is incorrect.
Why this is correct
The next hop is 10.1.12.2, the same as the neighbor, indicating the route is being sent back to the source, which violates BGP loop prevention unless the AS path is manipulated.
- ✗
The route 10.2.2.0/24 is locally originated.
Why it's wrong here
The path shows AS 65002, so it is learned from AS 65002, not locally originated.
- ✗
The route 10.2.2.0/24 has a weight of 0.
Why it's wrong here
Weight is 0, which is default for learned routes, but this is not a problem.
- ✗
The route 10.2.2.0/24 is not valid.
Why it's wrong here
It is marked with * and >, meaning valid and best.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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