mediumMultiple Choice
300-410 Practice Question: Runs the following command to verify BFD with…
A network engineer runs the following command to verify BFD with MPLS LDP:
R1# show mpls ldp neighbor 10.6.6.2 detail
Peer LDP Ident: 10.6.6.2:0, Local LDP Ident: 10.6.6.1:0 TCP connection: 10.6.6.2.646 - 10.6.6.1.53456 State: Oper; Msgs sent/rcvd: 100/100; Downstream Up time: 00:10:00 LDP discovery sources: GigabitEthernet0/2, hello interval: 5 s, hello hold: 15 s Addresses bound to peer LDP ident:
10.6.6.2 10.7.7.2
BFD enabled, BFD state: UP
What does this output indicate?
⚠ Common exam trap
300-410 often tests the confusion between LDP hello timers and BFD, leading candidates to think BFD is disabled if not explicitly configured in the output.
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
✓
BFD is enabled for LDP, allowing faster LDP session failure detection.
The output shows 'BFD enabled, BFD state: UP', indicating that BFD is operational for this LDP session, which allows faster failure detection than LDP hello timers alone.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
BFD is enabled for LDP, allowing faster LDP session failure detection.
Why this is correct
The line 'BFD enabled, BFD state: UP' confirms Bidirectional Forwarding Detection is bound to this LDP session, so sub-second failure detection replaces reliance on TCP or hello timers. LDP hellos only detect peer loss slowly; BFD provides rapid link failure notification for the MPLS forwarding path.
- ✗
BFD is disabled for this LDP session.
Why it's wrong here
The output line "BFD enabled, BFD state: UP" directly contradicts this; BFD is active on the session. It is tempting because LDP sessions can run without BFD, and disabling it would leave hello timers as the sole failure detection mechanism.
- ✗
LDP is using BFD only for IPv6.
Why it's wrong here
The neighbour output shows no address-family qualifier and the bound addresses are IPv4, so BFD is not scoped to IPv6. It is tempting because LDP does support separate IPv4 and IPv6 sessions, where per-family BFD could legitimately be configured.
- ✗
BFD state is DOWN, so LDP uses its own hello timers.
Why it's wrong here
The output explicitly states "BFD enabled, BFD state: UP", so claiming BFD is DOWN contradicts the displayed session status. It is tempting because LDP does fall back to hello timers when BFD fails, but that fallback is not occurring here.
Visual reference
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Related to this question
Learn chapter
BGP Basics and Neighbor Relationships
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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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
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.