350-501 Architecture Practice Question
Which protocol is used to exchange label binding information in a classic MPLS network without Segment Routing?
⚠ Common exam trap
Cisco often tests the distinction between control plane protocols (LDP for label exchange) and routing protocols (OSPF, IS-IS, BGP) to see if candidates confuse the role of IGPs in MPLS; the trap is assuming that because OSPF or IS-IS are used for routing, they also distribute MPLS labels.
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
In a classic MPLS network without Segment Routing, LDP (Label Distribution Protocol) is the standard protocol used to exchange label binding information. LDP assigns and distributes labels for each FEC (Forwarding Equivalence Class) based on the underlying IGP routing table, enabling label-switched paths (LSPs) without requiring RSVP or Segment Routing extensions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
LDP
Why this is correct
LDP is used for label distribution in classic MPLS.
- ✗
OSPF
Why it's wrong here
OSPF is an IGP, not a label distribution protocol.
- ✗
BGP
Why it's wrong here
BGP is used for VPN label distribution, not for IGP label binding.
- ✗
IS-IS
Why it's wrong here
IS-IS is an IGP, not a label distribution protocol.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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