mediumMultiple Choice
300-410 Practice Question: Runs the following command on Router R1: R1# show…
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?
⚠ Common exam trap
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.
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.
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 output shows State: Oper with 100/105 messages exchanged and 10:30 uptime, so the TCP session is established and healthy. A down session would display no peer entry or a non-Oper state; the TCP connection line merely reports the established socket endpoints, not a fault.
- ✓
The LDP session is operational and exchanging label information.
Why this is correct
The session shows State: Oper, confirming the TCP connection on port 646 is established and label messages are flowing (100 sent, 105 received). The "Downstream on demand" mode indicates labels are advertised only upon request, satisfying the operational state requirement in the output.
- ✗
The LDP session is in the process of being established.
Why it's wrong here
State: Oper confirms the session reached operational status, and the 00:10:30 uptime with 100/105 messages exchanged proves establishment completed. Establishment would show State: Initialized or a transitional state with little or no message traffic and negligible uptime.
- ✗
The LDP session is using downstream on demand mode, which is a problem.
Why it's wrong here
Downstream on demand is a valid, negotiated LDP label distribution mode, not an error; the session is Oper regardless. It is tempting because on-demand mode is unusual in modern networks, but it would be the correct answer only if the question asked which distribution mode is configured.
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Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
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.
Key term
MPLS Label Distribution
MPLS Label Distribution is the process by which routers exchange labels that tell them how to forward packets across a network without looking at the IP address each time.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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