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: 192.168.2.2:0, Local LDP Ident: 192.168.1.1:0 TCP connection: 10.1.1.2.646 - 10.1.1.1.646 State: Oper; Msgs sent/rcvd: 100/100; Downstream Up time: 00:45:00 LDP discovery sources: GigabitEthernet0/0, Src IP addr: 10.1.1.2 Addresses bound to peer LDP Ident:
10.1.1.2 192.168.2.2
Based on this output, what is the state of the LDP session?
⚠ Common exam trap
Cisco often tests the distinction between LDP discovery (UDP) and session establishment (TCP), and the trap here is that candidates may confuse the 'Oper' state with an initialization state or incorrectly assume UDP is used for the entire LDP process.
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 indicates the LDP session is operational. The 'Downstream' label distribution mode and the fact that messages have been sent and received (100/100) confirm that the session is actively exchanging label information. This matches the correct answer that the LDP session is operational and exchanging label information.
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 operational and exchanging label information.
Why this is correct
The session shows State: Oper with 100 messages sent and received, confirming both peers actively exchange label mappings over the TCP connection on port 646. The 45-minute uptime and populated peer address bindings further evidence a stable, fully established LDP adjacency satisfying the operational requirement.
- ✗
The LDP session is in a down state due to a TCP reset.
Why it's wrong here
The output shows State: Oper with 100 messages sent and received and 45 minutes uptime, indicating an established session, not a reset. A down state would display a non-Oper state or absent neighbour entry; the TCP connection line here confirms the session is fully operational.
- ✗
The LDP session is in initialization state because no labels have been exchanged.
Why it's wrong here
The output shows `State: Oper`, meaning the session is operational and label bindings have been exchanged; initialisation would display a different state. It is tempting because a freshly formed session can briefly show non-operational states, but the 45-minute uptime and 100 messages confirm established operation.
- ✗
The LDP session is using UDP instead of TCP.
Why it's wrong here
The output explicitly lists `TCP connection: 10.1.1.2.646 - 10.1.1.1.646`, confirming LDP uses TCP for session traffic. It is tempting because LDP discovery does use UDP port 646 for hello messages, but session establishment and label exchange always run over TCP.
Visual reference
Go deeper
Related to this question
Learn chapter
Device Management and Network Monitoring (SNMP, Syslog, NetFlow)
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.
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.
About these practice questions
Courseiva writes every 300-410 question from scratch — 1,401 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.