mediumMultiple Choice
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?
⚠ Common exam trap
300-410 often tests BGP loop prevention and the interpretation of show commands, causing candidates to misread the advertised-routes output as received routes.
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 output shows that the route 10.2.2.0/24 has a next hop of 10.1.12.2, which is the neighbor's IP, and the path shows 65002, indicating it was learned from that neighbor. The command 'show bgp neighbors 10.1.12.2 advertised-routes' displays routes advertised to that neighbor, so this route is being advertised back to the neighbor it was learned from, which is incorrect due to BGP loop prevention (unless allowas-in is configured).
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 output lists 10.2.2.0/24 with next hop 10.1.12.2, the same neighbour the command queries, proving R1 is advertising the prefix back to its originator. Standard BGP loop prevention should suppress this, so an outbound policy or missing inbound filter is leaking it.
- ✗
The route 10.2.2.0/24 is locally originated.
Why it's wrong here
The next hop 10.1.12.2 and AS-path 65002 show the prefix was received from an eBGP peer, not originated locally. Locally originated routes carry next hop 0.0.0.0 and weight 32768, as the 10.1.1.0/24 entry demonstrates, making that the correct interpretation.
- ✗
The route 10.2.2.0/24 has a weight of 0.
Why it's wrong here
Weight 0 is the default assigned to routes learned from external peers, so the value is accurate but reveals nothing distinctive about this prefix. Weight 32768 identifies locally originated routes, which is why the neighbouring 10.1.1.0/24 entry, not 10.2.2.0/24, is the locally sourced one.
- ✗
The route 10.2.2.0/24 is not valid.
Why it's wrong here
The leading asterisk and greater-than signs confirm the prefix is both valid and best, so it is installed in the BGP table. Invalid routes display without the valid status code, typically because the next hop is unreachable; here the next hop 10.1.12.2 is a reachable eBGP peer.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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