hardMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to verify MPLS LDP…
A network engineer runs the following command to verify MPLS LDP label bindings for a specific prefix:
R1# show mpls ldp bindings 10.0.0.0 255.0.0.0
Output: lib entry: 10.0.0.0/8, rev 10 local binding: label: imp-null remote binding: lsr: 10.0.0.2:0, label: imp-null remote binding: lsr: 10.0.0.3:0, label: 302
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
✓
R1 will pop the label for 10.0.0.0/8 before forwarding to the next hop
The output shows label bindings for prefix 10.0.0.0/8. R1 has assigned implicit null label (label 3) locally, meaning it will pop the label before forwarding. Neighbor 10.0.0.2 also uses implicit null, while 10.0.0.3 uses label 302.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 will pop the label for 10.0.0.0/8 before forwarding to the next hop
Why this is correct
Implicit null (imp-null) means the router will pop the label (PHP - Penultimate Hop Popping).
- ✗
R1 will swap the label for 10.0.0.0/8
Why it's wrong here
Implicit null means pop, not swap.
- ✗
All neighbors are using implicit null for this prefix
Why it's wrong here
Neighbor 10.0.0.3 is using label 302, not implicit null.
- ✗
The prefix 10.0.0.0/8 is not in the routing table
Why it's wrong here
The presence of label bindings suggests the prefix is in the routing table.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
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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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command to verify MPLS LDP label bindings: R1# show mpls ldp bindings 192.168.1.0 255.255.255.0 Output: lib entry: 192.168.1.0/24, rev 8 local binding: label: 101 remote binding: lsr: 10.0.0.2:0, label: 201 remote binding: lsr: 10.0.0.3:0, label: 301 What does this output indicate?
medium- ✓ A.The prefix 192.168.1.0/24 has a local label of 101 and two remote labels from LDP neighbors
- B.The prefix 192.168.1.0/24 is not reachable via any LDP neighbor
- C.Label 101 is the only label assigned to this prefix in the network
- D.The LDP session with 10.0.0.2 is down
Why A: The output shows the label bindings for the prefix 192.168.1.0/24 in the Label Information Base (LIB). The local label is 101, and two remote labels (201 from 10.0.0.2, 301 from 10.0.0.3) have been received from LDP neighbors.
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.