CCNP Practice Question: Which three statements about MPLS forwarding are…

Which three statements about MPLS forwarding are true? (Choose three.)

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

✓

MPLS forwarding uses the Label Forwarding Information Base (LFIB) to make forwarding decisions.

MPLS forwarding is based on a label lookup in the LFIB (Label Forwarding Information Base). The LFIB is populated by label distribution protocols such as LDP or RSVP-TE. The FIB (Forwarding Information Base) is used for IP forwarding, not MPLS. The LIB (Label Information Base) stores all labels learned from neighbors, but the LFIB is used for actual forwarding decisions. Option D is incorrect because the FIB is not used for MPLS forwarding. Option E is incorrect because the RIB (Routing Information Base) is used for IP routing, not MPLS label switching.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
MPLS forwarding uses the Label Forwarding Information Base (LFIB) to make forwarding decisions.
Why this is correct
Correct because the LFIB is the table used for MPLS label switching.
✓
The LFIB is populated by label distribution protocols such as LDP.
Why this is correct
Correct because LDP and other protocols distribute labels and populate the LFIB.
✓
The LIB stores all labels learned from LDP neighbors, but the LFIB is used for actual forwarding.
Why this is correct
Correct because the LIB contains all label bindings, while the LFIB contains only the best entries for forwarding.
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MPLS forwarding uses the Forwarding Information Base (FIB) for label lookups.
Why it's wrong here
Incorrect because the FIB is used for IP forwarding, not MPLS label switching.
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MPLS forwarding uses the Routing Information Base (RIB) to determine the next hop.
Why it's wrong here
Incorrect because the RIB is for IP routing; MPLS forwarding uses the LFIB.

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Written by Johnson Ajibi, MSc IT Security

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