The correct interpretation is that the prefix 192.168.10.0/24 has a local label of 21 and remote labels from two neighbors. This output from the show mpls ldp bindings command reveals the complete label binding state for a specific prefix: the local binding shows the label this router will impose when forwarding traffic to that network, while each remote binding lists a neighboring LSR (Label Switching Router) and the label that neighbor expects to receive. In the Cisco CCNP ENARSI 300-410 exam, this command is essential for verifying MPLS LDP route filtering and label distribution, as it confirms whether a prefix is being advertised or accepted from specific peers. A common trap is confusing the local label (the outbound label this router pushes) with remote labels (the inbound labels neighbors advertise); remember that local labels are what you give out, while remote labels are what you receive. For a quick memory tip, think “Local is my label to give, remote is their label to live.”
300-410 Route Maps and Route Filtering Practice Question
This 300-410 practice question tests your understanding of route maps and route filtering. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
OSPF neighbours must agree on key parameters.
Router ID selection can affect neighbour relationships and LSDB output.
OSPF cost influences the preferred path.
A route can appear in OSPF information but not become the installed route.
TExam Day Tips
→Check area mismatch first when OSPF adjacency fails.
→Review passive interfaces when a network is advertised but no neighbour forms.
→Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
Route Maps and Route Filtering — This question tests Route Maps and Route Filtering — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this 300-410 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 300-410 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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