350-501 MPLS and Segment Routing Practice Question
An MPLS core network uses LDP to distribute labels. An engineer wants to verify that the LDP session between two routers is up and exchanging labels. Which command should be used?
⚠ Common exam trap
Cisco often tests the distinction between verifying the LDP session itself (show mpls ldp neighbor) versus verifying the results of label exchange (show mpls forwarding-table), leading candidates to confuse the output of label distribution with the state of the label distribution protocol.
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 mpls ldp neighbor
The command 'show mpls ldp neighbor' displays the status of LDP sessions, including the neighbor's IP address, session state (e.g., Operational), and label exchange activity. Since LDP is the protocol used to distribute labels in this MPLS core network, this command directly verifies that the session is up and exchanging labels between the two routers.
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 mpls interfaces
Why it's wrong here
Shows interfaces with MPLS enabled, not session state.
- ✗
show mpls l2transport binding
Why it's wrong here
Used for L2VPN.
- ✓
show mpls ldp neighbor
Why this is correct
Displays LDP neighbors and session state.
- ✗
show mpls forwarding-table
Why it's wrong here
This shows label forwarding entries, not LDP session status.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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