- A
The LDP session is down due to a TCP connection issue.
Why wrong: The state is Oper, meaning it is up.
- B
The LDP session is operational and exchanging label information.
State Oper indicates the session is up and running.
- C
The LDP session is in the process of being established.
Why wrong: Oper is not a transitional state.
- D
The LDP session is using downstream on demand mode, which is a problem.
Why wrong: Downstream on demand is a valid mode.
Question 1,062 of 2,152
MPLS LDP Session Operational State Verification
This 300-410 practice question tests your understanding of device management. 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: 192.168.1.2:0, Local LDP Ident: 192.168.0.1:0 TCP connection: 192.168.1.2.646 - 192.168.0.1.49876 State: Oper; Msgs sent/rcvd: 100/105; Downstream on demand Up time: 00:10:30 LDP discovery sources: GigabitEthernet0/0, Src IP addr: 192.168.1.2 Addresses bound to peer LDP Ident:
192.168.1.2 10.1.1.2
Based on this output, what is the state of the LDP session?
Quick Answer
The answer is that the LDP session is operational, as indicated by the "State: Oper" field in the output. This state confirms that the Label Distribution Protocol session between the two routers is fully established and actively exchanging label information, evidenced by the sent/received message counters and the uptime of 00:10:30. On the Cisco CCNP ENARSI 300-410 exam, verifying the MPLS LDP session operational state is a core troubleshooting skill, often tested through show commands like `show mpls ldp neighbor` to distinguish between "Oper" (operational) and other states such as "INIT" or "OPENREC". A common trap is confusing the "Downstream on demand" label distribution mode with a session failure—this mode is normal for certain MPLS configurations and does not indicate a problem. Remember the memory tip: "Oper means open for business"—if you see "Oper" and a non-zero uptime, the session is healthy and labels are flowing.
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 LDP session is operational and exchanging label information.
The output shows 'State: Oper', which means the LDP session is operational. The 'Downstream on demand' label distribution mode is a valid mode (RFC 5036) and does not indicate a problem. The session is exchanging label information, as evidenced by the 'Oper' state and the presence of peer addresses.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 is down due to a TCP connection issue.
Why it's wrong here
The state is Oper, meaning it is up.
- ✓
The LDP session is operational and exchanging label information.
Why this is correct
State Oper indicates the session is up and running.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The LDP session is in the process of being established.
Why it's wrong here
Oper is not a transitional state.
- ✗
The LDP session is using downstream on demand mode, which is a problem.
Why it's wrong here
Downstream on demand is a valid mode.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that 'Downstream on demand' is a problem or that any mention of 'downstream' implies a failure, when in fact it is a standard operational mode for LDP.
Detailed technical explanation
How to think about this question
The LDP session state 'Oper' indicates that the session has completed the initialization phase (including TCP connection setup, initialization message exchange, and keepalive negotiation) and is actively exchanging label mappings. The 'Downstream on demand' mode means the downstream LSR only sends label mappings when explicitly requested by the upstream LSR, which is typical in environments where label space conservation is desired. The 'Up time' of 00:10:30 confirms the session has been stable for over 10 minutes.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The LDP session is operational and exchanging label information. — The output shows 'State: Oper', which means the LDP session is operational. The 'Downstream on demand' label distribution mode is a valid mode (RFC 5036) and does not indicate a problem. The session is exchanging label information, as evidenced by the 'Oper' state and the presence of peer addresses.
What should I do if I get this 300-410 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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