mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify MPLS LDP…
A network engineer runs the following command to verify MPLS LDP discovery sources:
R1# show mpls ldp discovery detail
Output: Local LDP Identifier: 10.0.0.1:0 Discovery Sources:
Interfaces:
GigabitEthernet0/0 (hello interval 5 s, targeted hello interval 10 s) LDP Id: 10.0.0.2:0, transport address: 10.0.0.2 Hold time: 15 s (local: 15, peer: 15) GigabitEthernet0/1 (hello interval 5 s, targeted hello interval 10 s) LDP Id: 10.0.0.3:0, transport address: 10.0.0.3 Hold time: 15 s (local: 15, peer: 15)
What does this output indicate?
⚠ Common exam trap
The trap is confusing link hellos with targeted hellos — candidates may see 'targeted hello interval' in the output and incorrectly conclude targeted hellos are in use, when the neighbors are actually discovered via interface (link) hellos.
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
✓
R1 has discovered two LDP neighbors via link hellos on two different interfaces
The output shows two discovery sources on GigabitEthernet0/0 and GigabitEthernet0/1, each with a distinct LDP ID (10.0.0.2:0 and 10.0.0.3:0) and transport address, confirming R1 has discovered two LDP neighbors via link (basic) hellos on two different interfaces. The presence of 'Interfaces:' with per-interface LDP IDs and hold times confirms active neighbor discovery, not targeted-only or down sessions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
R1 has discovered two LDP neighbors via link hellos on two different interfaces
Why this is correct
The output lists two discovery sources under "Interfaces", each showing a peer LDP Identifier and transport address, which confirms neighbours found through link (basic) hellos rather than targeted hellos. Both GigabitEthernet0/0 and GigabitEthernet0/1 satisfy the stem's requirement of verifying LDP discovery sources across two interfaces.
- ✗
R1 is using targeted hellos only
Why it's wrong here
Both entries sit under Interfaces with hello interval 5s, showing link-level discovery; targeted hellos would appear under a separate Targeted Hellos section. It is tempting because targeted hello interval 10s is displayed, but that value is merely the configured parameter, and targeted hellos are the correct choice for LDP over non-directly-connected peers.
- ✗
R1 has no LDP neighbors
Why it's wrong here
The output lists two interfaces, each with a peer LDP Id, transport address and hold time, which are discovered neighbours. It is tempting because the header says Discovery Sources rather than Neighbors, and a session must reach operational state before it appears in show mpls ldp neighbor, which is the correct command for adjacency state.
- ✗
The LDP session with 10.0.0.2 is down
Why it's wrong here
Discovery only proves hellos are exchanged; session state is shown by show mpls ldp neighbor, so nothing here indicates the session with 10.0.0.2 is down. It is tempting because a missing session entry can mean a failed adjacency, and checking session state is correct when hellos are present but no neighbour forms.
Go deeper
Related to this question
Learn chapter
OSPF Neighbor Adjacency and Basics
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 and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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