mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Route Summarization issue:
R1# show mpls ldp bindings 10.0.0.0/16
tib entry: 10.0.0.0/16, rev 1 local binding: label: 16 remote binding: lsr: 2.2.2.2:0, label: 17
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 summary route 10.0.0.0/16 has both a local and remote label binding, indicating MPLS LDP is operational for this prefix.
This output shows MPLS LDP label bindings for the prefix 10.0.0.0/16. There is a local label (16) and a remote label (17) from LSR 2.2.2.2. This indicates that the summary route is label-switched, and LDP has successfully assigned labels for it.
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 summary route 10.0.0.0/16 has both a local and remote label binding, indicating MPLS LDP is operational for this prefix.
Why this is correct
The presence of both local and remote bindings confirms LDP is working for the summary route.
- ✗
The summary route is not label-switched because no local binding exists.
Why it's wrong here
A local binding exists with label 16.
- ✗
The remote binding indicates that the route is not being summarized.
Why it's wrong here
The binding is for the /16 prefix, which is the summary.
- ✗
The label bindings are for the more specific /24 routes, not the summary.
Why it's wrong here
The output explicitly shows the prefix 10.0.0.0/16.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
BGP Route Aggregation
BGP Route Aggregation is a technique that combines multiple specific network routes into a single summary route to reduce the size of routing tables and improve network efficiency.
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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