mediumMultiple 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 route filtering:
R1# show mpls ldp bindings 192.168.10.0 255.255.255.0
lib entry: 192.168.10.0/24, rev 6 local binding: label: 21 remote binding: lsr: 2.2.2.2:0, label: 22 remote binding: lsr: 3.3.3.3:0, label: 23
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
✓
The prefix 192.168.10.0/24 has a local label of 21 and remote labels from two neighbors.
The output shows the MPLS LDP label bindings for prefix 192.168.10.0/24. The local label is 21, and remote labels from two LSRs (2.2.2.2 and 3.3.3.3) are 22 and 23 respectively. This indicates that the prefix is known in the MPLS network and labels have been assigned.
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 prefix 192.168.10.0/24 has a local label of 21 and remote labels from two neighbors.
Why this is correct
The output clearly shows the local binding label 21 and two remote bindings with labels 22 and 23.
- ✗
The prefix 192.168.10.0/24 is being filtered by a route-map.
Why it's wrong here
There is no indication of filtering; the bindings are present.
- ✗
The LDP session with 2.2.2.2 is down.
Why it's wrong here
A remote binding is present from 2.2.2.2, so the session is up.
- ✗
The prefix 192.168.10.0/24 is not in the routing table.
Why it's wrong here
The presence of LDP 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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Written by Johnson Ajibi, MSc IT Security
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