hardMultiple ChoiceObjective-mapped
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 vpnv4 vrf CUSTOMER-A 10.1.1.0/24
Output: BGP routing table entry for 10.1.1.0/24, version 10 Paths: (1 available, best #1, table CUSTOMER-A) Advertised to update-groups: 1 Refresh Epoch 1 Local
0.0.0.0 from 0.0.0.0 (10.0.0.1)
Origin incomplete, metric 0, localpref 100, weight 32768, valid, sourced, best Extended Community: RT:100:100 mpls labels in/out nolabel/nolabel
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 is locally originated and has no MPLS label
This shows a VPNv4 route for prefix 10.1.1.0/24 in VRF CUSTOMER-A. The path is local (sourced from this router), with next hop 0.0.0.0, and the route is valid and best. The extended community is RT:100:100. The mpls labels show nolabel/nolabel, meaning no MPLS label is assigned for this prefix, which could indicate a problem if labels are expected.
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 is locally originated and has no MPLS label
Why this is correct
The route is sourced locally (0.0.0.0 from 0.0.0.0) and the mpls labels are nolabel/nolabel.
- ✗
The route is learned from a BGP peer
Why it's wrong here
The next hop is 0.0.0.0, indicating local origin, not from a peer.
- ✗
The route has an MPLS label of 100
Why it's wrong here
The extended community RT:100:100 is not an MPLS label; labels are nolabel.
- ✗
The route is not best
Why it's wrong here
The output explicitly states 'best'.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MP-BGP for VPN
MP-BGP for VPN is an extension of the Border Gateway Protocol that carries multiple types of network layer information to enable scalable, isolated virtual private networks over a shared provider infrastructure.
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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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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