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300-410 Practice Question: Runs the following command to troubleshoot an…
A network engineer runs the following command to troubleshoot an MPLS L3VPN issue:
R1# show bgp neighbors 10.0.0.2 advertised-routes
Output: BGP table version is 10, local router ID is 10.0.0.1 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 0.0.0.0 0 32768 i
Total number of prefixes 2
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 two local prefixes to BGP neighbor 10.0.0.2
The show bgp neighbors advertised-routes command displays routes that the router is advertising to the specified neighbor. Here, R1 is advertising two prefixes (10.1.1.0/24 and 10.2.2.0/24) to neighbor 10.0.0.2. Both are locally originated (next hop 0.0.0.0) with origin IGP.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 is advertising two local prefixes to BGP neighbor 10.0.0.2
Why this is correct
The output shows two prefixes with next hop 0.0.0.0, indicating local origin, being advertised.
- ✗
R1 is receiving two prefixes from BGP neighbor 10.0.0.2
Why it's wrong here
This command shows advertised routes, not received.
- ✗
R1 has no BGP routes
Why it's wrong here
It has two routes being advertised.
- ✗
R1 is using OSPF to learn these prefixes
Why it's wrong here
The origin is IGP, but that does not specify OSPF; it could be any IGP or connected.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
Key term
LDP Protocol
LDP, or Label Distribution Protocol, is a protocol that routers use to automatically exchange labels that enable MPLS (Multiprotocol Label Switching) to create fast, efficient paths for data packets across a network.
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