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: 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?
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 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.
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 because the state is 'Oper'.
Why it's wrong here
'Oper' is the operational state, meaning the session is fully established and exchanging messages (123 sent, 120 received, 02:15:30 uptime). It is tempting because 'Oper' resembles operational-status wording, but in LDP the non-operational states are 'Initialized' and 'OpenSent', so this option inverts the meaning.
- ✓
The LDP session is established and operational.
Why this is correct
The State field shows Oper, meaning the LDP session completed discovery and TCP establishment and is exchanging label messages. The peer LDP identifier, bound addresses and 02:15:30 uptime confirm an active, operational adjacency over GigabitEthernet0/0, so the session is fully established.
- ✗
The LDP neighbor is using upstream label distribution.
Why it's wrong here
The output shows 'Downstream', indicating downstream label distribution, where labels are advertised from downstream to upstream routers. It is tempting because upstream distribution is a real LDP mode, but it applies only to ATM/Frame Relay label-controlled switches, not the frame-based GigabitEthernet interface shown here.
- ✗
The LDP session is using TCP port 179.
Why it's wrong here
The TCP connection line shows peer port 646 and local port 52868, which is LDP's well-known port; 179 belongs to BGP. It is tempting because both are routing-related TCP sessions, but the displayed port numbers directly contradict the claim.
Visual reference
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Related to this question
Learn chapter
Advanced EIGRP Features (Stub, Load Balancing, Named Mode)
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.
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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.