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 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?
The LDP session is down because the state is 'Oper'.
Why wrong: 'Oper' means operational, not down.
The LDP session is established and operational.
'State: Oper' indicates the session is operational.
The LDP neighbor is using upstream label distribution.
Why wrong: The output shows 'Downstream', not upstream.
The LDP session is using TCP port 179.
Why wrong: LDP uses TCP port 646, not 179.
Answer choices
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 is established and operational.
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The LDP session is down because the state is 'Oper'.
Why it's wrong here
'Oper' means operational, not down.
The LDP session is established and operational.
Why this is correct
'State: Oper' indicates the session is operational.
Related concept
OSPF neighbours must agree on key parameters.
The LDP neighbor is using upstream label distribution.
Why it's wrong here
The output shows 'Downstream', not upstream.
The LDP session is using TCP port 179.
Why it's wrong here
LDP uses TCP port 646, not 179.
Common exam traps
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 shows 'Downstream', not upstream.
Detailed technical explanation
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.
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
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.
What to study next
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.
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FAQ
MPLS Operations — This question tests MPLS Operations — OSPF neighbours must agree on key parameters..
The correct answer is: The LDP session is established and operational. — 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.
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.
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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