350-501 MPLS and Segment Routing Practice Question
Which two statements about MPLS label distribution are correct? (Choose two)
⚠ Common exam trap
Cisco often tests the distinction between LDP and TDP, and candidates mistakenly think TDP is a version of LDP, but TDP is a separate, obsolete protocol that was replaced by the standards-based 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
✓
LDP can establish sessions with non-directly connected neighbors using targeted LDP.
LDP can establish sessions with non-directly connected neighbors using targeted LDP, which uses UDP discovery (port 646) and TCP (port 646) to form a session even when the peers are not directly connected at Layer 3. This is defined in RFC 5036 and is commonly used in MPLS VPN inter-AS options and AToM scenarios.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RSVP-TE allocates labels based on LDP.
Why it's wrong here
RSVP-TE allocates labels for TE tunnels independently of LDP.
- ✓
LDP can establish sessions with non-directly connected neighbors using targeted LDP.
Why this is correct
Targeted LDP allows LDP sessions between non-adjacent routers.
- ✗
LDP uses the BGP next-hop as the label FEC.
Why it's wrong here
LDP uses the IGP next-hop (or destination prefix) as the FEC.
- ✓
LDP distributes labels for all IGP routes in the routing table.
Why this is correct
LDP allocates labels for every IGP prefix by default.
- ✗
TDP is the Cisco proprietary version of LDP.
Why it's wrong here
TDP was proprietary but is now deprecated; LDP is the standard.
Go deeper
Related to this question
About these practice questions
Courseiva writes every 350-501 question from scratch — 971 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 350-501 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 350-501 exam.