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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Device Access Control issue:
R1# show ip bgp vpnv4 vrf CUSTOMER-A 10.10.10.0/24
BGP routing table entry for 10.10.10.0/24, version 2 Paths: (1 available, best #1, table CUSTOMER-A) Not advertised to any peer Refresh Epoch 1 Local
10.1.1.2 from 10.1.1.2 (10.1.1.2)
Origin IGP, metric 0, localpref 100, valid, internal, best Extended Community: RT:100:100 mpls labels in/out nolabel/101
What does this output indicate?
⚠ Common exam trap
Cisco often tests the misconception that 'not advertised to any peer' means the route is not installed or usable, but in MPLS VPN contexts, a route can be installed and used for forwarding even if it is not advertised to BGP peers.
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 10.10.10.0/24 is installed in VRF CUSTOMER-A with an MPLS label of 101 for forwarding.
The output shows that the route 10.10.10.0/24 is installed in VRF CUSTOMER-A (table CUSTOMER-A) with an MPLS label of 101 for outgoing forwarding, as indicated by 'mpls labels in/out nolabel/101'. The route is valid, internal, and best, meaning it is used for forwarding despite not being advertised to any peer. This confirms that the MPLS label is applied for forwarding within the VRF context.
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 10.10.10.0/24 is installed in VRF CUSTOMER-A with an MPLS label of 101 for forwarding.
Why this is correct
The output shows the route is best and has an MPLS label of 101 for outbound forwarding.
- ✗
The route 10.10.10.0/24 is not installed because it is not advertised to any peer.
Why it's wrong here
The route is installed as best; 'not advertised to any peer' means it is not being advertised outbound, but it is in the table.
- ✗
The route 10.10.10.0/24 is learned from an external BGP peer.
Why it's wrong here
The path is marked as 'internal', meaning it came from an iBGP peer.
- ✗
The route 10.10.10.0/24 has no MPLS label and will be forwarded using IP lookup.
Why it's wrong here
The output shows 'mpls labels in/out nolabel/101', meaning an outbound label of 101 exists.
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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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.