mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a VRF-Lite BGP route advertisement issue:
R1# show bgp vpnv4 vrf CUSTOMER_D 10.2.2.0/24
Output: BGP routing table entry for 10.2.2.0/24, version 5 Paths: (1 available, best #1, table CUSTOMER_D) Advertised to update-groups: 1 Refresh Epoch 1 Local
10.1.1.2 (metric 20) from 10.1.1.2 (2.2.2.2)
Origin incomplete, metric 0, localpref 100, valid, internal, best Extended Community: RT:100:200 mpls labels in/out nolabel/20
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 10.2.2.0/24 is learned from 10.1.1.2 with an MPLS label of 20 and is the best path.
The 'show bgp vpnv4 vrf' command displays BGP VPNv4 route details for a specific VRF. The output shows route 10.2.2.0/24 is learned from neighbor 10.1.1.2 (router ID 2.2.2.2) with a metric of 20. It is valid, internal, and the best path. The route has an extended community RT:100:200 and an MPLS label of 20 (outgoing).
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 learned via an external BGP peer and is not the best path.
Why it's wrong here
Incorrect. The path is internal (iBGP) and is marked as best.
- ✓
The route 10.2.2.0/24 is learned from 10.1.1.2 with an MPLS label of 20 and is the best path.
Why this is correct
Correct. The output shows the route is internal, best, and has an MPLS label of 20.
- ✗
The route 10.2.2.0/24 is not advertised to any update groups.
Why it's wrong here
Incorrect. It is advertised to update-group 1.
- ✗
The route 10.2.2.0/24 has no extended community attached.
Why it's wrong here
Incorrect. The output shows Extended Community: RT:100:200.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
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.
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.
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Same concept, more angles
2 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command on Router R1: R1# show ip bgp vpnv4 vrf RED summary BGP router identifier 192.168.0.1, local AS number 65001 BGP table version is 5, main routing table version 5 4 network entries using 576 bytes of memory 4 path entries using 320 bytes of memory 2/1 BGP path/bestpath attribute entries using 320 bytes of memory 0 BGP route-map cache entries using 0 bytes of memory 0 BGP filter-list cache entries using 0 bytes of memory BGP using 1216 total bytes of memory BGP activity 4/0 prefixes, 4/0 paths, scan interval 60 secs Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd 10.1.1.2 4 65001 23 25 5 0 0 00:12:34 2 10.1.2.2 4 65002 18 20 5 0 0 00:10:15 1 Based on this output, which statement is correct?
medium- ✓ A.Both BGP neighbors are in the Established state.
- B.Neighbor 10.1.2.2 is in the Idle state.
- C.The local AS number is 65002.
- D.Neighbor 10.1.1.2 is in AS 65002.
Why A: The 'show bgp vpnv4 vrf RED summary' command displays BGP neighbors for VRF RED. It shows two neighbors: 10.1.1.2 (AS 65001) and 10.1.2.2 (AS 65002). Both are in the Established state with prefixes received. The neighbor 10.1.1.2 has received 2 prefixes, and 10.1.2.2 has received 1 prefix.
Variation 2. A network engineer runs the following command on Router R1: R1# show ip bgp vpnv4 vrf RED neighbors 10.1.1.2 advertised-routes BGP table version is 5, local router ID is 192.168.0.1 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, t secondary path, L long-lived-stale, Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 192.168.1.0/24 0.0.0.0 0 32768 i *> 192.168.2.0/24 0.0.0.0 0 32768 i Total number of prefixes 2 Based on this output, what is the problem?
hard- ✓ A.The routes are advertised with next hop 0.0.0.0, which will cause the neighbor to drop them.
- B.The routes are being advertised correctly.
- C.The BGP table version is 5, indicating a problem.
- D.The routes have weight 0, which is incorrect.
Why A: The 'show ip bgp vpnv4 vrf RED neighbors 10.1.1.2 advertised-routes' command displays routes that are candidates for advertisement. A next hop of 0.0.0.0 in this output indicates that the route is locally originated, but when the router actually sends the update, it will set the next hop to its own BGP update source IP. However, for VPNv4 routes, the standard behavior is that the next hop is not modified unless configured otherwise. In this case, the routes are advertised with next hop 0.0.0.0, which is invalid. The neighbor will likely discard these routes because the next hop is unreachable. Therefore, there is a problem: the routes are not being advertised correctly. Option B is incorrect because the next hop 0.0.0.0 is not valid for advertisement. Options C and D describe normal conditions: table version 5 is typical, and weight 32768 indicates locally originated routes.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.