350-501 Networking Practice Question
Which THREE are valid methods for label distribution in an MPLS network?
⚠ Common exam trap
Cisco often tests the distinction between label distribution protocols for core LSP establishment versus label-carrying protocols for services, so candidates may mistakenly select BGP as a core label distribution method when it is actually used for VPN label distribution.
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
✓
Segment Routing via IGP
Segment Routing via IGP (Option A) is a valid label distribution method because it uses the IGP (OSPF or IS-IS) to advertise prefix-SIDs, which are MPLS labels. The IGP distributes these labels as part of its link-state database, eliminating the need for a separate label distribution protocol like LDP. This is defined in RFC 8660 and RFC 8665 for OSPF and IS-IS respectively.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Segment Routing via IGP
Why this is correct
Segment routing uses IGP extensions to distribute prefix SIDs.
- ✓
RSVP-TE
Why this is correct
RSVP-TE distributes labels for TE tunnels.
- ✗
BGP
Why it's wrong here
BGP distributes VPN labels, not MPLS forwarding labels.
- ✓
LDP
Why this is correct
LDP is a standard label distribution protocol.
- ✗
TDP
Why it's wrong here
TDP is obsolete and replaced by LDP.
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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.