350-501 MPLS and Segment Routing Practice Question
In MPLS, which forwarding table is used to determine the outgoing label and interface for a labeled packet?
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
✓
LFIB
The LFIB (Label Forwarding Information Base) is the MPLS forwarding table that maps incoming labels to outgoing labels and interfaces.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
FIB
Why it's wrong here
FIB is for IP forwarding.
- ✗
LIB
Why it's wrong here
LIB (Label Information Base) stores all label bindings.
- ✓
LFIB
Why this is correct
Correct. LFIB is used for label switching.
- ✗
RIB
Why it's wrong here
RIB is the routing table.
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Written by Johnson Ajibi, MSc IT Security
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