mediumMultiple Choice
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 mpls ldp bindings 10.10.10.0 24
lib entry: 10.10.10.0/24, rev 2 local binding: label: 101 remote binding: lsr: 10.1.1.2:0, label: 102 remote binding: lsr: 10.1.2.2:0, label: 103
What does this output indicate?
⚠ Common exam trap
Cisco often tests the distinction between local and remote bindings in the LIB, and the trap here is that candidates may confuse the 'local binding' with a remote label or assume that multiple remote bindings from different LSRs are not used, when in fact they are all valid entries for potential forwarding paths.
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 router has a local label of 101 for the prefix and has learned two remote labels from two different neighbors.
The output of 'show mpls ldp bindings 10.10.10.0 24' displays the Label Information Base (LIB) entry for prefix 10.10.10.0/24. The 'local binding: label: 101' indicates that this router has assigned label 101 to the prefix. The two 'remote binding' lines show that two different LDP neighbors (LSR IDs 10.1.1.2 and 10.1.2.2) have advertised labels 102 and 103 respectively for the same prefix. This is the normal operation of LDP, where a router learns multiple remote labels for the same FEC from different peers.
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 router has a local label of 101 for the prefix and has learned two remote labels from two different neighbors.
Why this is correct
The output shows a local binding of label 101 for 10.10.10.0/24, plus two remote bindings from LSRs 10.1.1.2:0 and 10.1.2.2:0 with labels 102 and 103. This confirms the router has assigned its own label and received label mappings from two LDP neighbours, satisfying the troubleshooting requirement.
- ✗
The router has only a local label of 101; the remote bindings are not used because they are from the same LSR.
Why it's wrong here
The output lists two distinct remote LSRs (10.1.1.2:0 and 10.1.2.2:0), each advertising its own label, so the claim that they come from the same LSR is false. Remote bindings are used for forwarding. This option misreads the LSR identifiers shown in the lib entry.
- ✗
The label 102 is the local label for the prefix 10.10.10.0/24.
Why it's wrong here
Label 102 is a remote binding advertised by LSR 10.1.1.2:0, not the local label. The local binding is 101, generated by this router for the prefix. Confusing locally allocated labels with labels received from LDP peers is the trap; local labels appear only on the 'local binding' line.
- ✗
The router has no label for the prefix because the lib entry is incomplete.
Why it's wrong here
The lib entry is complete: it shows a local binding (101) plus two remote bindings, so a label does exist for 10.10.10.0/24. The 'rev 2' field is a revision counter, not an incompleteness indicator. This option misreads normal LDP binding output as a fault.
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
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 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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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.