Match each MPLS protection mechanism to its description.
Drag a concept onto its matching description — or click a concept then click the description.
Fast Reroute to bypass a failed link or node locally
End-to-end path protection for MPLS TE tunnels
Graceful restart for LDP to preserve forwarding during control plane restart
Prefix Independent Convergence for fast BGP failover
Fast Reroute for RSVP-TE tunnels using backup paths
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
MPLS Fast Reroute (FRR): Protects against link or node failures by pre-computing a backup path for each LSP.
The correct matches are: A (MPLS FRR), B (MPLS TE FRR), C (MPLS PW Redundancy), D (MPLS LSP Protection). Distractors E and F swap definitions or use incorrect descriptions.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
MPLS Fast Reroute (FRR): Protects against link or node failures by pre-computing a backup path for each LSP.
Why this is correct
MPLS FRR uses a backup LSP to quickly reroute traffic around a failure, typically within 50 ms.
MPLS Traffic Engineering Fast Reroute (TE FRR): Protects against failures in MPLS-TE tunnels by providing a bypass tunnel around the failed link or node.
Why this is correct
TE FRR specifically protects MPLS-TE tunnels by creating bypass tunnels that are pre-signaled.
MPLS PW Redundancy: Provides protection for pseudowires by establishing a backup PW that activates upon failure of the primary PW.
Why this is correct
PW redundancy uses a primary/backup PW pair to ensure service continuity for Layer 2 VPNs.
MPLS LSP Protection: Uses a dedicated 1:1 or 1+1 protection scheme for LSPs with a hot standby or cold standby path.
Why this is correct
LSP protection can be either 1:1 (protecting one LSP with another) or 1+1 (simultaneous transmission on both).
MPLS Fast Reroute (FRR): Protects against failures by using a globally reserved bandwidth pool for all backup LSPs.
Why it's wrong here
This describes resource reservation, not FRR; FRR uses per-LSP backup paths.
MPLS Traffic Engineering Fast Reroute (TE FRR): Protects against failures by relying on IP routing convergence of the IGP.
Why it's wrong here
TE FRR pre-signals bypass tunnels; it does not depend on IGP convergence, which is slower.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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