The answer is that the LDP session with 10.0.0.2 is operational and was discovered via link hello on GigabitEthernet0/0. This is correct because the "State: Oper" confirms the session is fully established and exchanging label information, while the "LDP discovery sources" line shows the neighbor was found through a non-targeted hello on a directly connected interface, as indicated by "hello interval: 5 s, targeted: no." On the Cisco CCNP ENARSI 300-410 exam, this output tests your ability to differentiate between link (direct) and targeted (remote) LDP neighbors, a common trap where candidates confuse the "Addresses bound" list with the discovery method. The "Downstream on demand" label distribution mode is also a key detail for MPLS traffic engineering scenarios. A helpful memory tip is to remember that "targeted: no" means the neighbor is directly connected, so think "no target, no tunnel—just a straight link."
300-410 MPLS Operations Practice Question
This 300-410 practice question tests your understanding of mpls operations. 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 examine MPLS LDP neighbor details:
R1# show mpls ldp neighbor detail
Output:
Peer LDP Ident: 10.0.0.2:0; Local LDP Ident 10.0.0.1:0
TCP connection: 10.0.0.2.646 - 10.0.0.1.55432
State: Oper; Msgs sent/rcvd: 123/456; Downstream on demand
Up time: 1w2d
LDP discovery sources:
GigabitEthernet0/0, hello interval: 5 s, targeted: no
Addresses bound to peer LDP Ident:
The LDP session with 10.0.0.2 is operational and was discovered via link hello on GigabitEthernet0/0
State is Oper, and discovery source is GigabitEthernet0/0 with no targeted hello.
B
The LDP session is using targeted hello
Why wrong: The output explicitly says 'targeted: no'.
C
The LDP session has been up for 1 minute and 2 seconds
Why wrong: Up time is 1w2d (1 week, 2 days), not 1m2s.
D
The neighbor is using downstream-on-demand label advertisement mode
Why wrong: The output shows 'Downstream on demand', which is correct, but the question asks what the output indicates overall. Option A is the most comprehensive and accurate.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The LDP session with 10.0.0.2 is operational and was discovered via link hello on GigabitEthernet0/0
The output shows detailed LDP neighbor information. The session is operational (State: Oper) for 1 week 2 days. The neighbor is directly connected via GigabitEthernet0/0 (non-targeted hello). The peer has multiple addresses bound to its LDP identifier.
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 LDP session with 10.0.0.2 is operational and was discovered via link hello on GigabitEthernet0/0
Why this is correct
State is Oper, and discovery source is GigabitEthernet0/0 with no targeted hello.
The LDP session has been up for 1 minute and 2 seconds
Why it's wrong here
Up time is 1w2d (1 week, 2 days), not 1m2s.
✗
The neighbor is using downstream-on-demand label advertisement mode
Why it's wrong here
The output shows 'Downstream on demand', which is correct, but the question asks what the output indicates overall. Option A is the most comprehensive and accurate.
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.
Trap categories for this question
Command / output trap
The output explicitly says 'targeted: no'.
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.
MPLS Operations — This question tests MPLS Operations — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: The LDP session with 10.0.0.2 is operational and was discovered via link hello on GigabitEthernet0/0 — The output shows detailed LDP neighbor information. The session is operational (State: Oper) for 1 week 2 days. The neighbor is directly connected via GigabitEthernet0/0 (non-targeted hello). The peer has multiple addresses bound to its LDP identifier.
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.
About these practice questions
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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 on Router R1:
R1# show mpls ldp neighbor
Peer LDP Ident: 10.0.0.2:0; Local LDP Ident 10.0.0.1:0
TCP connection: 10.0.0.2.646 - 10.0.0.1.52868
State: Oper; Msgs sent/rcvd: 123/120; Downstream
Up time: 02:15:30
LDP discovery sources:
GigabitEthernet0/0, Src IP addr: 192.168.1.2
Addresses bound to peer LDP Ident:
10.0.0.2 192.168.1.2
Based on this output, which statement is correct?
medium
A.The LDP session is down because the state is 'Oper'.
✓ B.The LDP session is established and operational.
C.The LDP neighbor is using upstream label distribution.
D.The LDP session is using TCP port 179.
Why B: The output shows a single LDP neighbor with state 'Oper' (operational), indicating the LDP session is up. The 'Downstream' mode is default. The peer LDP Ident is 10.0.0.2:0, and the local LDP Ident is 10.0.0.1:0. The addresses bound include the peer's router-id and the interface IP. No problems are indicated.
Last reviewed: Jun 18, 2026
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