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300-410 Practice Question: Which THREE commands would a network engineer use…
Which THREE commands would a network engineer use to troubleshoot an MPLS L3VPN issue where a CE router cannot reach a remote CE? (Choose THREE.)
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
✓
show ip route vrf CUSTOMER_A
Troubleshooting end-to-end connectivity involves checking the VRF routing table, the BGP VPNv4 table, and the MPLS forwarding table. 'show ip route vrf <vrf>' verifies that the remote prefix is present. 'show ip bgp vpnv4 vrf <vrf>' confirms BGP has the route. 'show mpls forwarding-table vrf <vrf>' checks for label entries. 'ping vrf' tests connectivity from the PE. 'show mpls ldp neighbor' checks LDP status, which is important for the underlay but not directly for VPN route presence.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
show ip route vrf CUSTOMER_A
Why this is correct
Checks if the remote CE prefix is in the VRF routing table.
- ✓
show ip bgp vpnv4 vrf CUSTOMER_A
Why this is correct
Verifies that the VPNv4 route is received and accepted by BGP.
- ✓
show mpls forwarding-table vrf CUSTOMER_A
Why this is correct
Confirms that MPLS labels are present for the remote prefix in the LFIB.
- ✗
ping vrf CUSTOMER_A <remote-ce-ip>
Why it's wrong here
This tests connectivity but does not provide diagnostic information about why it fails.
- ✗
show mpls ldp neighbor
Why it's wrong here
Checks LDP neighbor status, which is an underlay issue; not specific to VPN route troubleshooting.
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
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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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.